2018 Microchip Technology Inc. Advance Information DS50002762A dsPIC33CH Curiosity Development Board User’s Guide
2018 Microchip Technology Inc. Advance Information DS50002762A
dsPIC33CH CuriosityDevelopment Board
User’s Guide
DS50002762A-page 2 Advance Information 2018 Microchip Technology Inc.
Information contained in this publication regarding deviceapplications and the like is provided only for your convenienceand may be superseded by updates. It is your responsibility toensure that your application meets with your specifications.MICROCHIP MAKES NO REPRESENTATIONS ORWARRANTIES OF ANY KIND WHETHER EXPRESS ORIMPLIED, WRITTEN OR ORAL, STATUTORY OROTHERWISE, RELATED TO THE INFORMATION,INCLUDING BUT NOT LIMITED TO ITS CONDITION,QUALITY, PERFORMANCE, MERCHANTABILITY ORFITNESS FOR PURPOSE. Microchip disclaims all liabilityarising from this information and its use. Use of Microchipdevices in life support and/or safety applications is entirely atthe buyer’s risk, and the buyer agrees to defend, indemnify andhold harmless Microchip from any and all damages, claims,suits, or expenses resulting from such use. No licenses areconveyed, implicitly or otherwise, under any Microchipintellectual property rights unless otherwise stated.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of ourproducts. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such actsallow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV
== ISO/TS 16949 ==
Trademarks
The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A.
Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their respective companies.
© 2018, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-3181-7
dsPIC33CH CURIOSITY DEVELOPMENTBOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 5
Chapter 1. Introduction................................................................................................ 111.1 Schematics and Bill of Materials (BOM) ....................................................... 12
Chapter 2. Hardware .................................................................................................... 132.1 Powering the Board ...................................................................................... 13
2.1.1 USB Power ................................................................................................ 132.1.2 External Power .......................................................................................... 13
2.2 Using the Programmed Demo Firmware ...................................................... 142.3 Reprogramming and Debugging the dsPIC33CH128MP508 Device (U1) ...... 142.4 Using the Isolated USB-UART Interface ...................................................... 152.5 Circuit Details ............................................................................................... 15
2.5.1 Jumpers/Headers/Connectors ................................................................... 152.5.2 SMPS Hardware Overcurrent Protection ................................................... 162.5.3 SMPS Hardware Overvoltage Protection .................................................. 172.5.4 PWM DAC/DC Bias Generator .................................................................. 172.5.5 Transient Load Tester Circuit .................................................................... 18
2.6 Low-Side Current Sensing ........................................................................... 192.7 High-Side Current Sensing ........................................................................... 20
Appendix A. Schematics ............................................................................................. 21
Appendix B. Bill of Materials....................................................................................... 27
Worldwide Sales and Service .................................................................................... 30
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dsPIC33CH CURIOSITY DEVELOPMENT
BOARD USER’S GUIDEPreface
INTRODUCTION
This preface contains general information that will be useful to know before using the dsPIC33CH Curiosity Development Board. Topics discussed in this preface include:
• Document Layout• Conventions Used in this Guide• Recommended Reading• Recommended Reading• The Microchip WebSite• Development Systems Customer Change Notification Service• Customer Support• Document Revision History
DOCUMENT LAYOUT
This user’s guide provides an overview of the dsPIC33CH Curiosity Development Board. The document is organized as follows:
• Chapter 1. “Introduction” – This chapter introduces the dsPIC33CH Curiosity Development Board and provides a brief overview of its features.
• Chapter 2. “Hardware” – This chapter describes some of the noteworthy hardware features of the board.
• Appendix A. “Schematics” – This appendix provides schematic diagrams for the dsPIC33CH Curiosity Development Board.
• Appendix B. “Bill of Materials (BOM)” – This appendix provides the component list used in assembling the board.
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXXXXA”, where “XXXXXXXX” is the document number and “A” is the revision level of the document.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help. Select the Help menu, and then Topics to open a list of available on-line help files.
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dsPIC33CH Curiosity Development Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic characters Referenced books MPLAB® IDE User’s Guide
Emphasized text ...is the only compiler...
Initial caps A window the Output window
A dialog the Settings dialog
A menu selection select Enable Programmer
Quotes A field name in a window or dialog
“Save project before build”
Underlined, italic text with right angle bracket
A menu path File>Save
Bold characters A dialog button Click OK
A tab Click the Power tab
N‘Rnnnn A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.
4‘b0010, 2‘hF1
Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>
Courier New font:
Plain Courier New Sample source code #define START
Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’
Italic Courier New A variable argument file.o, where file can be any valid filename
Square brackets [ ] Optional arguments mcc18 [options] file [options]
Curly braces and pipe character: { | }
Choice of mutually exclusive arguments; an OR selection
errorlevel {0|1}
Ellipses... Replaces repeated text var_name [, var_name...]
Represents code supplied by user
void main (void){ ...}
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Preface
RECOMMENDED READING
This user’s guide describes how to use the dsPIC33CH Curiosity Development Board. The device-specific data sheets contain current information on programming the specific microcontroller or Digital Signal Controller (DSC) devices. The following Microchip documents are available and recommended as supplemental reference resources:
MPLAB® XC16 C Compiler User’s Guide (DS50002071)
This comprehensive guide describes the usage, operation and features of Microchip’s MPLAB XC16 C compiler (formerly MPLAB C30) for use with 16-bit devices.
MPLAB® X IDE User’s Guide (DS50002027)
This document describes how to set up the MPLAB X IDE software and use it to create projects and program devices.
dsPIC33CH128MP508 Family Data Sheet (DS70005319)
Refer to this document for detailed information on the dsPIC33CH Dual Core Digital Signal Controllers (DSCs). Reference information found in this data sheet includes:
• Device memory maps
• Device pinout and packaging details
• Device electrical specifications
• List of peripherals included on the devices
dsPIC33/PIC24 Family Reference Manual Sections
Family Reference Manual (FRM) sections are available, which explain the operation of the dsPIC® DSC MCU family architecture and peripheral modules. The specifics of each device family are discussed in the individual family’s device data sheet.
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dsPIC33CH Curiosity Development Board User’s Guide
THE MICROCHIP WEBSITE
Microchip provides online support via our website at www.microchip.com. This website is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the website contains the following information:
• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest.
To register, access the Microchip website at www.microchip.com, click on Customer Change Notification and follow the registration instructions.
The Development Systems product group categories are:
• Compilers – The latest information on Microchip C compilers and other language tools. These include the MPLAB® C compiler; MPASM™ and MPLAB 16-bit assemblers; MPLINK™ and MPLAB 16-bit object linkers; and MPLIB™ and MPLAB 16-bit object librarians.
• Emulators – The latest information on the Microchip MPLAB REAL ICE™ in-circuit emulator.
• In-Circuit Debuggers – The latest information on the Microchip in-circuit debugger, MPLAB ICD 4.
• MPLAB X IDE – The latest information on Microchip MPLAB X IDE, the Windows® Integrated Development Environment for development systems tools. This list is focused on the MPLAB X IDE, MPLAB SIM simulator, MPLAB X IDE Project Manager and general editing and debugging features.
• Programmers – The latest information on Microchip programmers. These include the MPLAB PM3 device programmer and the PICkit™ 3 development programmers.
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Preface
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.
Technical support is available through the website at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision A (June 2018)
This is the initial released version of this document.
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dsPIC33CH CURIOSITY DEVELOPMENTBOARD USER’S GUIDE
Chapter 1. Introduction
The dsPIC33CH Curiosity Development Board (DM330028) is intended as a cost-effective development and demonstration platform for the dsPIC33CH128MP508 family of dual core, high-performance Digital Signal Controllers. Some of the board hardware features are highlighted in Figure 1-1.
FIGURE 1-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD
Hardware Features:
1. dsPIC33CH128MP508 dual core, 16-bit DSP target device.
2. Integrated PICkit™-On-Board (PKOB) programmer/debugger.
3. 2x mikroBUS™ interfaces for hardware expansion, compatible with a wide range of existing click boards™ from MikroElektronika (www.mikroe.com).
4. 1x Red/Green/Blue (RGB) LED.
5. 2x general purpose red indicator LEDs.
6. 3x general purpose push buttons.
7. 1x MCLR Reset push button.
8. 10k potentiometer.
9. Galvanically isolated USB-UART interface, capable of up to 460,800 baud.
10. Female, 100 mil pitch, I/O pin access headers for probing and connecting to all target microcontroller GPIO pins.
11. Configurable Switch Mode Power Supply (SMPS) test circuit that can be operated in Buck, Boost, or Buck-Boost modes, using either Voltage mode or Peak Current mode control.
12. Converter output voltage screw terminal.
13. Configurable load step transient generator.
14. General purpose through-hole and SMT prototyping area.
3
514
13
11
6
1010
1
5
4
8
7
9
2
12
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dsPIC33CH Curiosity Development Board User’s Guide
1.1 SCHEMATICS AND BILL OF MATERIALS (BOM)
Schematics and the BOM for the dsPIC33CH Curiosity Development Board are located in Appendix A. “Schematics” and Appendix B. “Bill of Materials (BOM)”, respectively.
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dsPIC33CH CURIOSITY DEVELOPMENT
BOARD USER’S GUIDEChapter 2. Hardware
2.1 POWERING THE BOARD
2.1.1 USB Power
The board is intended to be primarily powered from the PKOB USB micro-B connector J20. Power is not sourced through USB connector J16, as it is part of the isolated USB-UART interface. The official “USB 2.0 Specification” restricts USB applications to consuming no more than 500 mA of USB VBUS power from the host. Polyfuse TH1 is rated for 500 mA to enforce the USB current restrictions and to help protect the board, or host, from damage in the event of unintended short circuits or SMPS output overloads.
When operating the board from USB power, approximately 300 mA of VBUS current is available to the SMPS circuit, as about 200 mA of the total should be reserved for use by the other non-SMPS circuitry on the board (ex: primarily U1, U4, U11, R17, LED5, etc.).
2.1.2 External Power
An external DC wall cube may optionally be connected if a DC barrel jack is installed in the unpopulated footprint J17. If an external wall cube is used, it should be well regulated and rated for 5.0V, ≤1.5A, with center pin positive. Compared to operating from USB power, powering the board with an external wall cube enables more power to be sourced by the SMPS circuit on the board. It is not necessary to use an external power supply for standard operation at lower current levels (e.g., SMPS circuit output load power of about <1.2W).
When the board is powered through J17, the polyfuse TH1 is bypassed, and therefore, it is recommended to use a wall cube with internal short circuit and overload protection (≤1.5A) to minimize the risk of circuit damage in the event of unintended short circuits. Additionally, if an external wall cube is used, it is recommended to cut a trace (NT2 on the top of the PCB) and populate D1 with a ≥1A rated Schottky diode (SOD-123). This will prevent any USB VBUS “backdrive” current from flowing out of the wall cube and into the attached host via J20. USB VBUS backdrive currents may not necessarily be destructive (when limited in current level), but are a USB compliance violation. They can interfere with the host operation, especially when the host is unpowered. This scenario can be avoided, however, via D1.
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dsPIC33CH Curiosity Development Board User’s Guide
DS
2.2 USING THE PROGRAMMED DEMO FIRMWAREThe development board comes programmed with some basic demo firmware, which exercises several of the board hardware features. For details on how to use the programmed demo firmware, please refer to the documentation associated with the source code for the demo, which can be obtained from:
www.microchip.com/dspic33chcuriosity
2.3 REPROGRAMMING AND DEBUGGING THE dsPIC33CH128MP508 DEVICE (U1)The board has a PICkit-On-Board (PKOB) programmer/debugger circuit, which can be used to program and debug both the Master and Slave cores in the dsPIC33CH128MP508 target device (U1). Alternatively, an external programmer/debugger tool can be connected to the board via the 6-pin inline connector J2, using a male-male 100 mil pitch 6-pin header.
During simultaneous “dual debug” of both the Master and Slave cores, two debugger tools are required. During simultaneous dual debug operation, the PKOB circuit can be used to debug the Master core, while an external programmer/debugger tool should be connected via the 6-pin 100 mil pitch connector J15 using a male-male header. Two programmer/debugger tools are only required when performing dual core simultaneous debug operations. When programming or debugging only a single core (either Master or Slave) at a time, the on-board PKOB circuit is sufficient.
The PKOB circuit should automatically enumerate and be recognized by the MPLAB® X IDE v4.10 or later, when the Curiosity Board is connected to the host via the USB micro-B connector J20. No custom USB driver installation is necessary as the PKOB circuit relies on standard OS provided HID drivers, and therefore, driver instal-lation should be fully automatic. When plugged in, the PKOB programmer/debugger tool can be selected from the MPLAB X project properties page by selecting the device under: Hardware Tools>Microchip Starter Kits>Starter Kits (PKOB)>dsPIC33CH Curio…, as shown in Figure 2-1.
FIGURE 2-1: dsPIC33CH CURIOSITY PKOB TOOL SELECTION
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Hardware
2.4 USING THE ISOLATED USB-UART INTERFACE
The board implements a galvanically isolated USB-UART interface based around the MCP2221A chip. The MCP2221A implements the standard Communication Device Class (CDC) – Abstract Control Model (ACM) protocol, and therefore, can use standard USB drivers that are provided with modern Windows®, Mac® and Linux® operating systems. Under most operating systems, the USB driver installation will be fully auto-matic. Under certain older operating systems, or if the device is attached to an older than Windows 10 machine without an active internet connection, manual installation of the drivers may be necessary. In this case, the driver package can be downloaded from:
www.microchip.com/mcp2221a
Details on how to access the serial port from Mac and Linux operating systems can also be found in the associated collateral for the MCP2221A. Under Windows, after successful USB driver installation, the device will appear as a “COMx” port object, which standard serial terminal programs can open/read/write to and from.
2.5 CIRCUIT DETAILS
Some of the circuit blocks in the schematics may not have immediately obvious purpose or method of operation. This section highlights some of these circuit elements and provides an explanation for their intent and function.
2.5.1 Jumpers/Headers/Connectors
J1 – This is an unpopulated 2-pin, 100 mil jumper header, which may optionally be used to insert a current meter in series with the U1 VDD current path to measure the micro-controller current consumption. In order to measure the U1 current, the trace on the bottom of the PCB, that shorts the two pins of J1, should be cut and a 2-pin jumper should be soldered into J1.
J2 – This is an unpopulated 6-pin staggered header interface, which can optionally be used to connect an external programmer/debugger tool to the target microcontroller U1. Ordinarily, it is not necessary to use J2, since the integrated programmer/debugger (PKOB) circuit connects to the same U1 program/debug interface pins.
J3 – This is a female header that implements the mikroBUS Interface A, which can be used to attach hardware daughter boards to expand the functionality of the development board.
J8 – This is a female header that implements the mikroBUS Interface B, which can be used to attach hardware daughter boards to expand the functionality of the development board.
J10 – This jumper sets the -3 dB low-pass filter breakpoint frequency of the RC network, composed of R54 + C26/C41. When the jumper is open, the low-pass filter frequency is around 15.9 kHz, but with the jumper capped, it is around 1.4 kHz. When a sufficiently high-frequency PWM waveform is generated on RC5, the low-pass filter can smooth it into a near DC value, which is buffered by op amp U8, providing a software controlled DAC capability.
J11 – This is a female I/O pin access header used for accessing the U1 microcontroller I/O pins.
J12 – This is a female I/O pin access header used for accessing the U1 microcontroller I/O pins.
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J13 – This jumper sets the effective resistor divider feedback ratio for the SMPS output voltage when it is measured by the U1 ADC. When the SMPS is used to generate rel-atively low voltages (ex: 0V-6.5V), it is suggested to keep J13 capped to maximize feedback circuit sensitivity. When the SMPS will be used to generate voltages above 6.5V, J13 should be opened to ensure the feedback voltage stays within the input sensing range of the ADC.
J14 – This is an unpopulated 2-pin jumper location that can be used to disconnect the SMPS transient generator circuitry from the output of the SMPS circuit. In order to disconnect the transient generator circuit, it is suggested to populate J14 with a 2-pin jumper header and to cut the trace (NT5) on the bottom of the PCB linking the pins of J14.
J15 – This is an unpopulated 6-pin staggered header interface that can optionally be used to connect an external programmer/debugger tool to the target microcontroller U1 when performing dual simultaneous debug of both the Master and Slave cores. The J15 header connects to the Slave debug port, S1PGx3, and is only intended for use during dual debug operations. For single core debug of either the Master or Slave, either J2 or the PKOB circuit should be used. The holes for J15 are slightly staggered, which provides some friction retention force, without requiring physical soldering, when a straight male-male or right angle male-male header is installed in J15.
J16 – This is a standard female USB micro-B connector, which connects to the MCP2221A USB-UART converter chip. This USB interface is a data interface only, as it is galvanically isolated from the rest of the application circuitry and does not supply power to the rest of the board.
J17 – This is an unpopulated footprint that may optionally be used to install a standard DC barrel jack for externally powering the board from a regulated 5.0V wall cube.
J18 – This is a female I/O pin access header for accessing certain U1 microcontroller I/O pins, along with the various power rails implemented on the development board.
J19 – This is an unpopulated 2-pin jumper header, that may optionally be used as an attachment point for connecting an external frequency response analyzer tool, for measuring the SMPS control loop phase/gain characteristics. The 20 Ohm load resistor (R96) is connected directly across the J19 pins.
J20 – This is a standard female USB micro-B connector that is intended to be used to power the board and provide a USB communication path when using the integrated programmer/debugger (PKOB) circuit.
J21 – This is a 2-pin screw terminal that provides access to the SMPS VOUT and GND nets. This is a convenient place for attaching external loads that may be powered by the SMPS circuit.
2.5.2 SMPS Hardware Overcurrent Protection
The components, Q11, C22, R67, U10, and the high-side current sense resistors, R59 + R74, implement a crude form of hardware-based overcurrent protection. In a normal/real application SMPS design, overcurrent protection is often provided through the use of comparator(s), which would typically be implemented using the comparators and DACs inside the microcontroller. However, during initial firmware development, the code for enabling the DACs + comparators may not have been written and debugged yet, at the time of, say, accidentally dropping an oscilloscope ground lead onto the demo board. This could result in an unanticipated random short circuit. In these scenarios, the hardware overcurrent protection circuit implemented by Q11, U10 and surrounding components can potentially help protect the circuit from damage.
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Hardware
During an overcurrent condition, when the current through R59 + R74 starts to exceed approximately 1.2A (ex: 600 mV sense voltage), the base of Q11 will become forward biased and it will begin to turn on. This will quickly charge the capacitor C22 to the Schmitt trigger VIH input logic high threshold of the U10 logic chip (which is configured as a Schmitt trigger OR gate). Once the VIH level is reached, the U10 output will go high (independent of the RC14_S1PWM7H signal), thus turning off the high-side P-channel MOSFET Q6.
At this point, the current through Q6 will drop to zero, Q11 will turn off, but C22 will remain charged near the VIH level until it is eventually bled down to the VIL level through R67. The U10 output will not immediately switch back on due to the Schmitt trigger hysteresis voltage between the VIH and VIL input thresholds of U10. It takes approxi-mately 40% of an RC time constant (between C22 + R67) for the VIL threshold to be reached, which enforces a minimum Q6 off time of roughly 80 µs. This delay is suffi-cient for the L1 inductor current to drop all the way to zero due to the energy loss in the diodes D2, D5 and the resistance in the freewheeling current path.
Therefore, even during short-circuit conditions with improperly implemented firmware control signals, the average current can be maintained at a reasonably safe level. Once the firmware for enabling and using the internal U1 comparators and DACs has been developed/debugged, it is expected that the Q11 and related hardware overcurrent protection components would be omitted, since they would become somewhat redundant in the final application design.
2.5.3 SMPS Hardware Overvoltage Protection
The components, Q7, C15, R64, R65, R66 and U5, implemented a hardware-based output overvoltage protection feature in a manner similar to the hardware overcurrent protection circuit. When a conventional boost converter is operated open loop without enough load on the output, the output voltage can theoretically rise to an indeterminate high level, which can potentially avalanche the output Schottky diode, the boost MOSFET or the output capacitors.
When the output voltage rises above approximately 16V, the output of the resistor divider (R65 + R66) will become high enough to begin forward biasing the Q7 base and turning on the transistor. This will quickly discharge C15 from 3.3V down to the VIL Schmitt trigger input threshold of the Schmitt AND gate implemented by U5. This over-rides the PWM control signal and shuts down Q2 until such time as the output overvoltage condition has decayed away, and enough time has elapsed for R64 to charge C15 back up to the VIH Schmitt trigger input threshold of U5 (automatically re-enabling PWM activity on Q2).
In a typical/real SMPS application, the closed-loop output feedback control loop would normally be responsible for preventing output overvoltage conditions from occurring. However, during initial firmware development, the closed-loop control algorithms may not yet be fully implemented and operational (or may be halted from normal operation, for example, due to hitting a debug breakpoint in the firmware). In these scenarios, the hardware output overvoltage protection circuitry can help to prevent potential circuit damage.
2.5.4 PWM DAC/DC Bias Generator
The RC5_S1PWM2L net is intended to be driven with a fixed frequency PWM wave-form. The low-pass filter, consisting of R54 + C26 (and C41 when jumper J10 is capped), averages the PWM waveforms, and for a high PWM frequency, generates an adjustable DC voltage. Op amp U8 buffers the DC voltage, providing a low-impedance firmware adjustable DAC, where the output voltage is based on the PWM duty cycle provided to the circuit.
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2.5.5 Transient Load Tester Circuit
The MOSFET Q8 and surrounding components implement an adjustable constant-current sink that can be periodically pulsed on for a few milliseconds at a time to generate momentary SMPS output load transient pulses. During control loop firm-ware development, it is often desirable to study the control system behavior in response to large signal step changes.
By monitoring the SMPS output voltage waveforms in response to the load step transient event, one can get an idea of the real world output voltage undershoot during the transient and the subsequent overshoot that will occur after the transient load is rapidly removed. Additionally, the transient response recovery waveform shapes can also provide hints as to likely control loop stability and approximate phase margin.
Load step transient response curves exhibiting damped sinusoidal oscillating output voltage, that takes a long time to recover to steady-state DC values, implies a control loop with low phase margin, while an over damped RC-like recovery waveform implies higher phase margin.
When the RC13_TRANSIENT logic signal is driven high, the MOSFET Q8 will begin to turn on through the gate resistor R79. However, as the gate voltage rises, current will begin to flow through the MOSFET and current sense resistor R94, which will create a voltage that is sensed by Q9. When the voltage at the base of Q9 is sufficient to turn it on, it will begin sinking current from the gate of Q8, preventing the gate voltage from rising further and maintaining MOSFET Q8 in the linear region, where it behaves like a voltage controlled constant-current sink.
Components, R83 and C40, provide compensation for the MOSFET Q8 gate waveform to ensure small signal stable regulation of the constant current. The relative sizes of R79 and R87 set the DC gain of the constant-current regulation control loop.
The value of current sense resistor R94 sets the current limit, but it is made adjustable by biasing the base of Q9, up or down, via the resistor dividers R84 and R85. When the S1PWM2L_DAC_ISET DC voltage level is high (e.g., near 3.3V), Q9 will always be turned on, even with no current through R94 due to the resistor divider output (of R84 + R85) being higher than the turn-on voltage of the BJT Q9. Conversely, when the S1PWM2L_DAC_ISET DC voltage is low (e.g., near 0.0V), this decreases the voltage appearing on the Q9 base, requiring larger currents through R94 before the MOSFET Q8 gate voltage becomes limited.
Adjusting the PWM waveform duty cycle on RC5_S1PWM2L by +1.0% alters the Q8 constant-current sink value by approximately -12 mA. At 50% PWM duty cycle, the approximate current sink level is around 390 mA, but will vary somewhat between boards and at different ambient temperatures, as these will affect the Q9 turn-on voltage. For exact current sink values, it is necessary to use closed-loop control by measuring the RA2_TRANSIENTFB current sense voltage with the ADC at run time. Then, using the resulting value to fine-tune adjust the PWM duty cycle on RC5_S1PWM2L.
Since Q8 is driven in the linear region during the transient pulse, the instantaneous power dissipation within the MOSFET can be quite high, potentially up to 15W if the circuit is configured for 15V output and 1A pulse load current. This power dissipation level cannot be sustained indefinitely without a substantial heat sink, but for short pulses (ex: ≤100 ms based on the safe operating area graph in the MCP87130T MOSFET data sheet), the thermal inertia of the MOSFET die and package allow the junction temperature to stay below the 150ºC maximum of the device. However, in between pulses, enough time must be allowed for the die and package to cool back to room temperature, before the next pulse, in order to ensure reliable operation of the circuit. It is therefore recommended to control RC13_TRANSIENT, so as to generate short pulses (ex: ≤10 ms) with long off times between pulses (ex: pulse rate of ~5 Hz).
DS50002762A-page 18 Advance Information 2018 Microchip Technology Inc.
Hardware
In the event of improper firmware control of the RC13_TRANSIENT net (e.g., DC logic high or high time pulses > 10 ms), Q8 would potentially experience high sustained power dissipation, and unless protected somehow, would be vulnerable to thermal failure. To prevent this scenario, components, Q10, R88, C51, R90 and R91, imple-ment a crude maximum on-time restricting sub-circuit, which is intended to limit the Q8 on time to roughly 10 ms maximum.
When RC13_TRANSIENT goes high, C51 begins charging through R88 and will eventually reach approximately 2x the VBE forward voltage necessary to turn on Q10. At this point, the output voltage of the resistor dividers, R90 and R91, rises high enough that Q10 begins turning on, sinking current/voltage away from the gate of Q8 and even-tually turning off the MOSFET Q8. When RC13_TRANSIENT is eventually driven logic low, C51 discharges through R90 and R91, resetting the circuit automatically.
2.6 LOW-SIDE CURRENT SENSING
During Buck mode operation, it is sometimes desirable to be able to measure the current during the off time of MOSFET Q6 if implementing some form of “peak valley” or Average Current mode control algorithm. Low-side current sensing during the MOSFET off time is possible via the current sense resistors, R63, R92 and R93. How-ever, the voltage developed across the current sense resistors will be a negative voltage with respect to ground. The signal is therefore connected to the inverting input of one of the PGAs in the microcontroller, which can then be used to invert and amplify the negative voltage into a positive voltage that can be measured by the ADC or used by a comparator inside the device.
When supplying a negative input voltage to the PGA, it is important to maintain the I/O pin voltage within the absolute maximum ratings from the device data sheet, which allows for negative voltages only within VSS to (VSS – 300 mV) range. Therefore, Schottky diode D9 and resistor R95 are used to clamp the negative voltages to within the 0V to -300 mV range. However, it is important to be aware that the inverting inputs to the PGAs on the device have approximately 10k typical input impedance from the device data sheet, and therefore, the resistance of R95 will reduce the gain of the amplifier for a given PGA setting. Such that, in this configuration, the firmware should not rely on the absolute output voltage of the PGA to reflect the true current through the sense resistors, unless the overall gain of the complete circuit is directly measured and factored into the computations in the firmware.
2018 Microchip Technology Inc. Advance Information DS50002762A-page 19
dsPIC33CH Curiosity Development Board User’s Guide
2.7 HIGH-SIDE CURRENT SENSING
The SMPS on-time current can be measured by the voltage developed across the high-side current sense resistors, R59 and R74. However, the ISENSEH signal is referenced to the +5V input rail of the SMPS circuit (not to ground), which prevents it from being measured directly by the ADC or comparators in the microcontroller U1. Therefore, the ISENSEH voltage signal is level shifted (to be ground referenced) and amplified by the components, U7A, Q1, R52 and R98, with an effective gain of 3.3.
Components, R97 and R102, add a small DC bias (approximately -71 mV, before level shifter gain or about +235 mV at RA3_ISENSEH), which appears at the RA3_ISENSEH microcontroller pin as an intentional offset error in the current measurement. This intentional DC biasing ensures that the current sense voltage signal is always within the U1 comparator input sensing range and the internal DAC reachable range, even when the Q6 current is exactly 0.0 mA with realistic comparator and DAC offset voltages.
The final output voltage on RA3_ISENSEH is related to the Q6 current approximately, as shown in Equation 2-1 and Equation 2-2 (where RA3_ISENSEH is the voltage in volts measurable with the microcontroller ADC; VIN is the +5V rail input voltage, which may be ~4.6V under load during operation and IQ6 is the current through the MOSFET Q6 in amps). Equation 2-1 and Equation 2-2 were derived by simplifying and substitut-ing resistor values into Equation 2-3 through Equation 2-6, which in turn, were derived from the schematic implementation.
EQUATION 2-1:
EQUATION 2-2:
EQUATION 2-3:
EQUATION 2-4:
EQUATION 2-5:
EQUATION 2-6:
RA3_ISENSEH 0.04877 • VIN + 1.626 • IQ6
RA3_ISENSEH – 0.04877 • VINIQ6 1.626
Rsense = = 0.5 Ohms1R59
1R74+
–1
ISENSEH_BIASED = (VIN – IQ6 • Rsense) R102(R102 + R97)
RA3_ISENSEH = R98R52 (VIN – ISENSEH_BIASED)
RA3_ISENSEH = R98R52 [ ](VIN – IQ6 • Rsense)(R102)
R102 + R97
VIN –
DS50002762A-page 20 Advance Information 2018 Microchip Technology Inc.
dsPIC33CH CURIOSITY DEVELOPMENTBOARD USER’S GUIDE
Appendix A. Schematics
The schematics for the dsPIC33CH Curiosity Development Board (DM330028) are shown in Figure 1 through Figure 4.
2018 Microchip Technology Inc. Advance Information DS50002762A-page 21
dsP
IC33C
H C
urio
sity Develo
pm
ent B
oard
User’s G
uid
e
DS
50
00
27
62
A-p
ag
e 2
2A
dv
anc
e In
form
atio
n
20
18
Micro
chip
Te
chn
olo
gy In
c.
Designed with
Altium.com
RB0_OSCI
820R06031%
R9
820R06031%
R1 0
1 4
2 3
S2
1 4
2 3
S1
10k1%
R3
10k1%
R1
3V3
3
3
RE0_LED1
RE1_LED2
RED
LED1
RED
LED2
2 1
43
GR
EENRED
BLU
E
5 6
L E D3
LED_RGB
14
23
S4
3
4.7k06031%
R7
123 4
56
SC-70
123 4
56
SOT-23
Prototyping Area
G eneral Purpose LEDs
RGB LED
Buttons
P otentiometer
8 MHz Oscillator
21
3
10k
20%
R17
3V3
n
MCLRReset Button
10k1%
R5
1 4
2 3
S3
3
0.1 μF25V0603
C2
RA0_POT270R1%
R16
0.1 μF25V0603
C1
STB1
GND2 OUT 3VDD4
DS C 6011J I1A-008.0000
X 1
FIGURE A-1: dsPIC33CH CURIOSITY BOARD SCHEMATIC REV. 1.0 (SHEET ONE OF FOUR)
Pin
70
Pin
26
Pin
50
3V3
3V
3V
RD5_RGB_RED
RD7_RGB_GREEN
RB14_RGB_BLUE
Pin
51
Pin
71
Pin
25
12DNP
J 1
Net Tie
NT1
U1VDD
U1VDD
RB4_PGC2RB3_PGD2
3V3
VPP/MCLRVDD
GND
ICSPCLKNC
ICSPDAT
123456
HDR-2.54 Male 1x6 STAGGERED
DNP
J2
1k06031%
R8
3V
Currentmeasurement point
(Local VDD/VSS bypass/decoupling for U1)
MCLR
RE7_S1
RE8_S2
MCLR
MCLR
Pin
25Pi
n 26
RD0_RXA
3V3
I2C Pull-ups (DNP)Note: Not populated, typically installed omikroBUS daughter boards instead.
RB8_SCLB
RB9_SDAB
DNPR21
DNPR22
mikroBUS™ Interface AAN1
RST2
CS3
SCK4
MISO5
MOSI6
+3.3V7
GND8
PWM 16
INT 15
RX 14
TX 13
SCL 12
SDA 11
+5V 10
GND 9
J3
3V3
RD4_RSTA
RD1_TXARD0_RXA
RE13_SDAARE12_SCLARD6_MISOA
RC3_MOSIA
RB10_SCKA
RC7_ANA RB15_PWMARD2_INTA
RD3_CSA 1k
R14
AN1
RST2
CS3
SCK4
MISO5
MOSI6
+3.3V7
GND8
PWM 16
INT 15
RX 14
TX 13
SCL 12
SDA 11
+5V 10
GND 9
J 8
mikroBUS™ Interface B
3V3
RB7_CSBRC6_RSTB
RB9_SDABRB8_SCLBRC11_TXB
RC10_RXB
RC9_MISOB
RB2_ANB
RD8_MOSIB
RC4_PWMBRB13_INTB
RC8_SCKB
1kR19
U1VDD
RE9_S3
3VRD1_TXARD2_INTARD3_CSARD4_RSTA
RD6_MISOA
RD8_MOSIB
RE0_LED1RE1_LED2
RE8_S2RE9_S3
RA0_POT
RA4_S1MCLR3
RB0_OSCI
RB2_ANBRB3_PGD2RB4_PGC2RB5_S1PGD3RB6_S1PGC3RB7_CSBRB8_SCLBRB9_SDAB
RB13_INTB
RB15_PWMA
RC12
RC3_MOSIARC4_PWMB
RC6_RSTBRC7_ANARC8_SCKBRC9_MISOBRC10_RXBRC11_TXB
Pin
32
Pin
11Pi
n 12
Pin
31
Pin
12Pi
n 11
RB14_RGB_BLUE
RD5_RGB_RED
RD7_RGB_GREEN
RB6_S1PGC3RB5_S1PGD3
3V3
VPP/MCLRVDD
GND
ICSPCLKNC
ICSPDAT
RA4_S1MCLR3
Slave Debug Only (during dual debug)
123456
HDR-2.54 1x6 STAGGERED
J15
100R 06031%R20
0.1 μF25V 0603
C4
0.1 μF25V 0603
C13
0.1 μF25V 0603
C3
0.1 μF25V0603
C12
1k06031%
R6
1k06031%
R4
1k06031%
R2
4.7k 06031%R99
3V3
RE7_S1
330RR12
330RR13
330RR11
Master and Slave Programming/Debug (also connects to PKOB circuit output)
0.1 μF25V0603
C60.1 μF25V0603
C70.1 μF25V0603
C80.1 μF25V0603
C90.1 μF25V0603
C1 1
5V
5V
RD14_ISENSEL
RA3_ISENSEH
RA1_VINSENSERA2_TRANSIENTFB
RC1_VOUTFB
RC14_S1PWM7HRC15_S1PWM7L
RC5_S1PWM2L
RC13_TRANSIENT
RC0_PWMDACFB
1k06031%
R73
RD12_S1PGA2P2
20k1%
R77
RB1_IBIAS2
RD9
RD11
RD13
RD15
RE2RE3RE4RE5RE6
RE10RE11RE12_SCLARE13_SDAARE14RE15
RB10_SCKARB11RB12
RD10
RC2
RE13_SDAA
RE12_SCLA DNPR78
DNPR81
10 μF25V0805
C1 0
16V1 μF
0603
C5
RP46/PWM1H/RB14 1
RE02
RP47/PWM1L/RB15 3
RE14
RP60/PWM4H/RC12 5
RP61/PWM4L/RC13 6
RP62/S1PWM7H/RC14 7
RP63/S1PWM7L/RC15 8
MCLR9
PCI22/S1PCI22/RD1510
VSS11
VDD12
PCI21/S1ANN1/S1PGA2N2/S1PCI21/RD1413 S1ANN0/S1PGA1N2/RD1314
AN12/S1AN10/IBIAS3/RP48/RC0 15
AN0/CMP1A/RA0 16
RE217
AN1/S1AN15/RA1 18
RE319
AN2/S1AN16/RA2 20
AN3/IBIAS0/S1AN0/S1CMP1A/S1PGA1P1/RA3 21
RE422
AN4/IBIAS1/S1MCLR3/S1AN1/S1CMP2A/S1PGA2P1/S1PGA3P2/RA4 23
RE524
AVDD25
AVSS26
S1AN14/S1PGA2P2/RD1227
AN13/S1ANA1/ISRC0/RP49/RC1 28
AN14/S1ANA0/ISRC1/RP50/RC2 29
RP54/S1AN11/S1CMP1B/RC6 30
VDD31
VSS32
CMP1B/S1AN8/S1CMP3B/RP51/RC3 33
OSC I/CLKI/AN5/RP32/S1AN5/RB0 34
OSCO/CLKO/AN6/IBIAS2/RP33/S1AN4/RB1 35
S1AN17/S1PGA1P2/RD1136
S1PGA3N2/RE637
ISRC3/S1AN13/S1CMP2B/RD1038
RE739 AN15/ISRC2/RP55/S1AN12/RC7 40
DACOUT/AN7/CMP1D/RP34/INT0/S1MCLR2/S1AN3/S1ANC0/S1ANC1/S1CMP1D/S1CMP2D/S1CMP3D/RB2 41
RE842
PGD2/AN8/RP35/S1PGD2/S1AN18/S1CMP3A/S1PGA3P1/RB3 43
RE944
PGC2/RP36/S1PGC2/S1AN9/S1PWM5L/RB4 45
RP56/ASDA1/SCK2/S1ASDA1/S1SCK1/RC8 46
RP57/ASCL1/SDI2/S1ASCL1/S1SDI1/RC9 47
PCI20/S1PCI20/RD948 SDO2/PCI19/S1SDO1/S1PCI19/RD849
VSS50
VDD51
RP71/S1PWM8H/RD752 RP70/S1PWM6H/RD653 RP69/S1PWM6L/RD554 PGD3/RP37/SDA2/S1PGD3/RB5 55
PGC3/RP38/SCL2/S1PGC3/RB6 56
RE1057
TDO/AN9/RP39/S1MCLR1/S1AN6/S1PWM5H/RB7 58
RE1159
PGD1/AN10/RP40/SCL1/S1PGD1/S1AN7/S1SCL1/RB8 60
PGC1/AN11/RP41/SDA1/S1PGC1/S1SDA1/RB9 61
ASCL2/RE1262
RP52/S1PWM2H/RC4 63
ASDA2/RE1364
RP53/S1PWM2L/RC5 65
RP58/S1PWM1H/RC10 66
RP59/S1PWM1L/RC11 67
RP68/S1PWM3H/RD468 RP67/S1PWM3L/RD369
VSS70
VDD71
RP66/S1PWM8L/RD272 RP65/S1PWM4H/RD173 RP64/S1PWM4L/RD074
TMS/RP42/PWM3H/RB10 75
TCK/RP43/PWM3L/RB11 76
RE1477
TDI/RP44/PWM2H/RB12 78
RE1579
RP45/PWM2L/RB13 80
U1 dsPIC33CH128MP508
Sch
ematics
2
01
8 M
icroch
ip T
ech
no
log
y Inc.
Ad
van
ce
Info
rma
tion
DS
50
00
27
62
A-p
ag
e 2
3
FIG )
Designed with
Altium.com
1 23 4
5 67 8
9 1011 12
13 1415 16
17 1819 20
222123 24
25 2627 28
29 3031 32
33 3435 36
HDR-2.54 Female 2x18
J11
3V3n Access Headers
1 23 4
5 67 8
9 10
HDR-2.54 Female 2x5
J18VOUT 5V
B RA3_ISENSEH
3V3
4 RA4_S1MCLR3RE5
RE3RA1_VINSENSERE2RA0_POT
RC4_PWMB
B
B
RC10_RXBRC11_TXB
RC14_S1PWM7HRC15_S1PWM7L
RC5_S1PWM2L
RC13_TRANSIENT
RC0_PWMDACFB
RC12
I
22
GD3
B
RB13_INTBRB15_PWMA
RB14_RGB_BLUE
RB10_SCKARB11RB12
RE0_LED1RE1_LED2
RE13_SDAA
RE14RE15
RD0_RXARD1_TXA RD2_INTARD3_CSA RD4_RSTA
OA
SIB
RD14_ISENSELRD13
RD15MCLR
TFB
URE A-2: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET TWO OF FOUR
I/O Pi
16V1 μF
0603
C30
Isolated USB-UART Interface
100kR76
ID 4
VBUS1
GND 5
D- 2
D+ 3
0
USB micro-B TH/SMT
J 16
U9D_PU9D_N
U9D_PU9D_N
VDD1GP0 2GP1 3RST 4UART RX 5UART TX 6GP2 7GP38
SDA9
SCL10
VUSB11
D-12
D+13
VSS14
MCP2221AU9
U9_V DD
U9_V DD
16V1 μF0603
C31
U9_G ND
U9_G ND
U9_G ND
U9_G ND
U9_V DD
U9_G ND
U9_G ND
3V3
1k0603
1%R75
RC10_RXBRC11_TXB
460.8 kB aud max
DNP
231J17
If installing J17, us e regulated 5V (5.5V max) isolated wall cube with center pin positive. Also recommended to cut NT2 and populate D1 to prevent VBUS backdrive current.
VBUS5
0.1 μF25V
C33
0.1 μF25V 0603
C29
0.1 μF25V 0603
C32
1 23 4
5 67 8
9 1011 12
13 1415 16
17 1819 20
222123 24
25 2627 28
29 3031 32
33 3435 36
HDR-2.54 Female 2x18
J12
3V3
Power Status (Green)LED5
5V
Power Supply
470R06031%
R182.2 μF10V0603
C232.2 μF10V0603
C39
VOUT1
VOUT2
GND 3EN4 NC5 VIN6
MIC5528 3V3
U12DNPD1
Net Tie0.5 mm
NT2
5VDNP
D7
Net Tie0.5 mm
NT3
VDD11
A12
A23
GND14 GND2 5
B2 6B1 7
VDD28
SI8422AB -D-IS
U11
RA2_TRANSIENTFRE
RC2RC3_MOSIA
RC6_RST
RC7_ANA
RC8_SCKBRC9_MISO
RB0_OSC
RB2_ANBRB3_PGDRB4_PGC
RB5_S1PRB6_S1PGC3RB7_CSBRB8_SCLB
RB9_SDA
RB1_IBIAS2
RE8_S2RE9_S3
RE7_S1RE6
RE10RE11
RE12_SCLA
RD6_MIS
RD8_MO
RD5_RGB_REDRD7_RGB_GREEN
RD10
RD12_S1PGA2P2
RD9
RD11
U1VDD
RC1_VOU
Isol
atio
n
5V
dsP
IC33C
H C
urio
sity Develo
pm
ent B
oard
User’s G
uid
e
DS
50
00
27
62
A-p
ag
e 2
4A
dv
anc
e In
form
atio
n
20
18
Micro
chip
Te
chn
olo
gy In
c.
FOUR)
Designed with
Altium.com
100R0603
1%
R56
3V3
12
J 10
z (J10 Open)z (J10 Closed)
4.7k1%
R70
Resistor Gain (J13 Closed) = 0.5481 (1.470 mV/ADC LSB at 12-bit, 3.3 VREF)
1k1%
R57
VOUT_FB
12
J13
1k06031%
R72
Resistor Gain (J13 Open) = 0.1754 (4.592 mV/ADC LSB at 12-bit, 3.3 VREF)
3V3
100R0603
1%R55
S1PWM2L_DAC_ISET
1PWM2L DAC/DC Bias Generator/RC Filter
0.010 μF25V0603
C26
DNP
C44
DNP
C43
DNPR86
0.1 μF25V
C25
0.1 μF25V0603
C41
100R06031%
R52
330R1%
R98
DNP
C46100R0603
1%R61
High-side current sense level shifter
Output voltage feedback circuit
+A3
-A2
OUTA 1
A
AVSS
4
VDD
8
MCP6292U7A
0.1 μF 25V0603
C24
+A3
-A4
OUTA 1
VSS
2
VDD
5
MCP6001U8
5V
5V
+B5
-B6
OUTB 7B
MCP6292
U7BB AT 54D8
3
1 2
RZM001P02T2LQ1
RA3_ISENSEH
12DNP
J19
RC0_PWMDACFB
20R08051%
6
ASED
RC1_VOUTFB
_J 10
_J 13
Designed with
Altium.com
FIGURE A-3: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET THREE OF
1k06031%
R54
RC15_S1PWM7L
TP LOOP BlackDNPTP5
Pole at ~ 15.9 kHPole at ~ 1.45 kH
10 μF25V0805
C3410 μF25V0805
C35
RSX
101M
M-3
0TR
D5
10 μF25V0805
C36
4.7k1%
R80
1k06031%
R85
470R
0603
1%
R831k0603
1%
R79
13
2MMBT3904Q 9
100R
0603 1%
R87
VOUT
0.010 μF 25V
0603C40
2.2k06031%
R84
S
On- time restrictorsub-circuit Adjustable constant-current transient load
Note: Q8 is driven in the linear region.Limit (peak power) * (on-time) product tomaintain peak Q8 juntion temp <150°C. 4
1,2,3
5,6,7,8
MCP87130TQ 8
13
2MMBT3904Q10
10k1%
R88
20k06031%
R90
20k0603
1%R91
MMBD914D6
10k1%
R89
Transient Load Tester Circuit
1R1206
1%
1/4W
R94
1R1206
1%
1/4W
R9 31R
12061%
1/4W
R9 2
1R1206
1%
1/4W
R591R1206
1%
1/4W
R7410 μF25V0805
C42
0603DNP
C3 8100R0603
1%R9 5
0.1 μF 25V0603
C37
16V1 μF0603
C51
470R06031%
R103
0603DNP
C52
Buck mode low-side off-time currentsense (Note: 0. 0V to -300 mV signal,
suggest -8x PGA gain)
For Buck Mode: PWM Q6, Drive Q2 DC OFFFor Boost Mode: Drive Q6 DC OFF (logic high or tri-state) , PW M Q2For Buck/Boost Mode: PWM Q6 and Q2 with s ame signal (Note: Q6 drive s hould be active-low, Q2 active-high)
Configurable Buck, Boost or Buck/Boost Test Circuit
Input voltage mo nitoring
41,2,3
5,6,7,8
MCP87130T
Q 2
3V3
0R0603
R60
0.1 μF25V0603
C21
5V
5V
330R1%
R15
5V
1R
12061%
1/4W
R6 3
BAT54D9
13
2MMBT3904Q 7
VOUT
0.010 μF25V 0603
C15
10k1%
R65
270R1%
R66
0.010 μF25V0603
C2220k0603
1%
R67
12
3
MMBT3906Q11
5V
1k06031%
R68
DNPC45
DNPR71
DNPR69
Hardware overcurrent protection (useful during
firmware development)
Output overvoltage protection (useful during firmware development)
ISENSEH
10 μF25V0805
C47
VOUT
GND2
I03 Y 4
Vcc 5
I2 6I11
NC7SZ58P6X
U105V
Configured as : Schmitt OR
C onfigured as : Schmitt AND
GND2
I03 Y 4
VCC5
I2 6I11
NC7SZ57P 6X
U5
3V3
3V3
ISENSEH_BIASED
RD14_ISENSEL
RA1_VINSENSE
RA2_TRANSIENTFB
5V
RC14_S1PWM7H
820R1%
R58
RC5_S1PWM2L
S1PWM2L_DAC_ISET
RC13_TRANSIENT
VOUT
Net TieNT5
12
DNPJ14
RSX
101M
M-3
0TR
D2
10 μF25V0805
C5310 μF25V0805
C55
10k 1%R82
5V
12
TERMINAL 1x2
J21VOUT
R9
10k1%
R102150R06031%
R97
ISENSEH_BI
ISENSEH
10k1%
R64
0.010 μF25V0603
C54
100 μF25V
C57
L ow ESR
Screw
3
1 2
BSS308PEQ 6
33 μH
L1
270R1%
R62
Sch
ematics
2
01
8 M
icroch
ip T
ech
no
log
y Inc.
Ad
van
ce
Info
rma
tion
DS
50
00
27
62
A-p
ag
e 2
5
FIG R)
Designed with
Altium.com
13
2MMBT3904Q 5
330R1%
R32 4.7k1%
R31
10k1%
R49
100R1%
R47MCLR
4.7k1%
R37
330R1%
R29
330R1%
R36
PKMOSI
PKMISO
PKSCK
RB3_PGD2
RB4_PGC2
13
2MMBT3904Q 4
10k1%
R46
12
3MMBT3906Q 3
10k1%
R44
3V3
100k1%
R42
3V3
Target ICSP™ Signals
Bumpon Hemisphere Black
PAD1 PAD2 PAD3 PAD4
URE A-4: dsPIC33CH CURIOSITY BOARD LAYOUT SCHEMATIC REV. 1.0 (SHEET FOUR OF FOU
100k1%
R45
D_PD_N
D_ND_P
3.16k1%
R27
1k1%
R25
VDD_SENSEVPP_SENSE
VPP_SENSE
VDD_SENSE
10k1%
R48
PKEE_CS
PKEE_WPPKEE_SCK
PKEE_MISO
PKEE_MISO
PKEE_CS
10k1%
R50
PKEE_SCK
PKEE_MOSI
PKEE_MOSIPKEE_WP
10k1%
R24
PKSCKPKMISOPKMOSI
PK_PGCPK_PGD
3V3
3V3
3V3
3V3 3V3
3V3
3V3 3V3 3V3
10k1%
R33
3V3
+t
500 mA Polyfuse1210TH1
100R1%
R2 8
10k1%
R35
10k1%
R38
3V3
2
31DNPX2
DNPR41DNP
R39
3V3 3V3
RC11_TXB
RC10_RXBDNP
R40
DNP
R43
1k06031%
R30
1k06031%
R34
3.57k06031%
R26
ID 4
VBUS1
GND 5
D- 2
D+ 3
0
USB MICRO-B FEMALE
J 20
PICkit™ On-Board
PKOB Serial EEPROM (25LC256)
3V3
PKOB USB Interface
123456
J9
PK_PGDPK_PGC
3V3
VPP/MCLRVDD
GND
ICSPCLKNC
ICSPDAT
PKVBUS
10 μF25V0805
C14
3V3
DSC 6011J I1A-012.0000
10k1%
R51
4.7k1%
R23
4.7k1%
R53
12
3 MM
BT
3906
Q12
0.1 μF25V0603
C49
20k
06031%
R101
0.1 μF25V0603
C50
20k0603
1%R100
PKVBUS
16V1 μF0603
C48
(with VBUS inrush slew rate limiting)
VBUS5
0.1 μF25V
C160.1 μF25V
C170.1 μF25V
C180.1 μF25V
C19
0.1 μF25V0603
C27
0.1 μF25V0603
C28
0.1 μF25V0603
C20
CS1
SO 2
WP3
VSS4
SI5 SCK6
HOLD7
VCC8
25L C 256-I/SN
U6
PMD5/CN63/RE5 1
SCL3/PMD6/CN64/RE6 2
SDA3/PMD7/CN65/RE7 3
C1IND/RP21/PMA5/CN8/RG64
C1INC/RP26/PMA4/CN9/RG75
C2IND/RP19/PMA3/CN10/RG86
MCLR7
RP27/PMA2/C2INC/CN11/RG98
Vss9
VDD10
PGEC3/AN5/C1INA/VBUSON/RP18/CN7/RB5 11PGED3/AN4/C1INB/USBOEN/RP28/CN6/RB4 12AN3/C2INA/VPIO/CN5/RB3 13AN2/C2INB/VMIO/RP13/CN4/RB2 14PGEC1/AN1/VREF -/RP1/CN3/RB1 15PGED1/AN0/VREF+/RP0/PMA6/CN2/RB0 16
PGEC2/AN6/RP6/CN24/RB6 17
PGED2/AN7/RP7/RCV/CN25/RB7 18
AVDD19
AVss20
AN8/RP8/CN26/RB8 21
AN9/RP9/PMA7/CN27/RB9 22
TMS/CVREF/AN10/PMA13/CN28/RB10 23
TDO/AN11/PMA12/CN29/RB11 24
Vss25
VDD26
TCK/AN12/PMA11/CTED2/CN30/RB12 27
TDI/AN13/PMA10/CTED1/CN31/RB13 28
AN14/CTPLS/RP14/PMA1/CN32/RB14 29
AN15/RP29/REFO/PMA0/CN12/RB1530
SDA2/RP10/PMA9/CN17/RF431
SCL2/RP17/PMA8/CN18/RF532
RP16/USBID/CN71/RF333
VBUS34
VUSB35
D-/RG336 D+/RG237
VDD38
OSCI/CLKI/CN23/RC12 39
OSCO/CLKO/CN22/RC15 40
Vss41
RTCC/DMLN/RP2/CN53/RD8 42
DPLN/SDA1/RP4/CN54/RD9 43
SCL1/RP3/PMCS2/CN55/RD1044
RP12/PMCS1/CN56/RD11 45
DMH/RP11/INT0/CN49/RD0 46
SOSCI/C3IND/CN1/RC13 47
SOSCO/T1CK/C3INC/RPI37/CN0/RC14 48
VCPCON/RP24/CN50/RD1 49
DPH/RP23/CN51/RD2 50
RP22/PMBE/CN52/RD3 51
RP25/PMWR/CN13/RD4 52
RP20/PMRD/CN14/RD5 53
C3INB/CN15/RD6 54
C3INA/CN16/RD7 55
VCAP/VDDCORE56
ENVREG57
VBUSST/VCMPST1/CN68/RF058
VCMPST2/CN69/RF159
PMD0/CN58/RE0 60
PMD1/CN59/RE1 61
PMD2/CN60/RE2 62
PMD3/CN61/RE3 63
PMD4/CN62/RE4 64
U4
3
1 2
DMP2100UQ13
STB1
GND2 OUT 3
VDD4
12.00 MH z
X 3
PIC24FJ256GB106-I/PT
dsPIC33CH Curiosity Development Board User’s Guide
NOTES:
DS50002762A-page 26 Advance Information 2018 Microchip Technology Inc.
dsPIC33CH CURIOSITY DEVELOPMENTBOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS
Qty. Designator Description Mfg. 1 Mfg. 1 Part # Mfg. 2 Mfg. 2 Part #
28 C1, C2, C3, C4, C6, C7, C8, C9, C11, C12, C13, C16, C17, C18, C19, C20, C21, C24, C25, C27, C28, C29, C32, C33, C37, C41, C49, C50
Capacitor Ceramic, 0.1 µF, 25V, 10%, X7R, SMD, 0603
Murata Electronics®
GRM188R71E104KA01D Wurth Elektronik 885012206071
5 C5, C30, C31, C48, C51
Capacitor Ceramic, 1 µF, 16V, 10%, X7R, SMD, 0603
Taiyo Yuden Co., Ltd.
EMK107B7105KA-T Wurth Elektronik 885012206052
9 C10, C14, C34, C35, C36, C42, C47, C53, C55
Capacitor Ceramic, 10 µF, 25V, 10%, X5R, SMD, 0805
Murata Electronics
GRM21BR61E106KA73L
5 C15, C22, C26, C40, C54
Capacitor Ceramic, 0.010 µF, 25V, 10%, X7R, SMD, 0603
Yageo Corporation
CC0603KRX7R8BB103 Wurth Elektronik 885012206065
2 C23, C39 Capacitor Ceramic, 2.2 µF, 10V, 10%, X7R, SMD, 0603
MurataElectronics
GRM188R71A225KE15D Wurth Elektronik 885012206027
1 C57 Capacitor Aluminum, 100 µF, 20%, 25V, Low-ESR, Radial
KEMET ESY107M025AE3AA
19 R1, R3, R5, R24, R33, R35, R38, R44, R46, R48, R49, R50, R51, R64, R65, R82, R88, R89, R102
Resistor TKF, 10k, 1%, 1/10W, SMD, 0603
Panasonic® - ECG
ERJ-3EKF1002V
17 R2, R4, R6, R8, R14, R19, R25, R30, R34, R54, R57, R68, R72, R73, R75, R79, R85
Resistor TKF, 1k, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF1001V
8 R7, R23, R31, R37, R53, R70, R80, R99
Resistor TKF, 4.7k, 1%, 1/10W, SMD, 0603
ROHM Semiconductor
MCR03EZPFX4701
3 R9, R10, R58 Resistor TKF, 820R, 1%, 1/10W, SMD, 0603
Stackpole Electronics, Inc.
RMCF0603FT820R
8 R11, R12, R13, R15, R29, R32, R36, R98
Resistor TKF, 330R, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF3300V
3 R16, R62, R66 Resistor TKF, 270R, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF2700V
1 R17 Resistor, Variable, 10K, 20%, TH
Alps Electric Co., Ltd.
RK09K1130A5R
3 R18, R83, R103 Resistor TKF, 470R, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF4700V
9 R20, R28, R47, R52, R55, R56, R61, R87, R95
Resistor TKF, 100R, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF1000V
1 R26 Resistor, SMD, 3.57 kOhm, 1%, 1/10W, 0603
Vishay/Dale CRCW06033K57FKEA
1 R27 Resistor TKF, 3.16k, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF3161V
3 R42, R45, R76 Resistor TKF, 100k, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF1003V
6 R59, R63, R74, R92, R93, R94
Resistor TKF, 1R, 1%, 1/4W, SMD, 1206
ROHM Semiconductor
MCR18EZHFL1R00
1 R60 Resistor TKF, 0R, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3GSY0R00V
6 R67, R77, R90, R91, R100, R101
Resistor TKF, 20k, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF2002V
2018 Microchip Technology Inc. Advance Information DS50002762A-page 27
dsPIC33CH Curiosity Development Board User’s Guide
1 R84 Resistor TKF, 2.2k, 1%, 1/10W, SMD, 0603
Panasonic - ECG
ERJ-3EKF2201V
1 R96 Resistor TKF, 20R, 1%, 1/8W, SMD, 0805
ROHM Semiconductor
MCR10EZHF20R0
1 R97 Resistor TKF, 150R, 1%, 1/10W, SMD, 0603
Stackpole Electronics, Inc.
RMCF0603FT150R
1 L1 Inductor, 33 µH, 1.7A, 0.120R, TH
Bourns®, Inc. RLB0914-330KL Wurth Elektronik 7447471330
2 D2, D5 Diode Schottky, 30V, 1A, PMDU ROHM Semiconductor
RSX101MM-30TR
1 D6 Diode Rectifier, MMBD914LT1G, 1V, 10 mA, 100V, SMD, SOT-23-3
ON Semiconductor®
MMBD914LT1G
2 D8, D9 Diode Schottky, BAT54, 800 mV, 200m A, 30V, SOT-23-3
Diodes Incorporated®
BAT54-7
2 LED1, LED2 Diode LED Red, 2V, 20 mA, 104 mcd, Diffuse, SMD, 0805
OSRAM Opto Semiconductors GmbH.
LS R976-NR-1 Wurth Elektronik 150080RS75000
1 LED3 Diode LED Tri Red, Green, Blue Cree, Inc. CLX6D-FKB-CMPQSGKBB7A363
1 LED5 Diode LED Green, 2.2V, 25 mA, 15 mcd, Clear, SMD, 0603
Kingbright Electronics Co., Ltd.
APT1608SGC Wurth Elektronik 150060GS75000
3 Q3, Q11, Q12 Transistor BJT PNP, MMBT3906, -40V, -200 mA, 300 mW, SOT-23-3
Diodes Incorporated
MMBT3906-7-F
5 Q4, Q5, Q7, Q9, Q10
Transistor BJT NPN, MMBT3904, 40V, 200 mA, 310 mW, SOT-23-3
Diodes Incorporated
MMBT3904-7-F
1 Q1 MOSFET P-CH, 20V, 0.1A, SOT-723-3
ROHM Semiconductor
RZM001P02T2L
1 Q6 MOSFET P-CH, 30V, 2A, SOT-23
Infineon Technologies AG
BSS308PEH6327XTSA1
1 Q13 MOSFET P-CH, 20V, 4.3A, SOT-23
Diodes Incorporated
DMP2100U-7
2 Q2, Q8 MOSFET N-CH, 25V, MCP87130T-U/LC
Microchip Technology Inc.
MCP87130T-U/LC
4 J3, J8 Connector Header-2.54 Female, 1x8, 0.100" (2.54 mm), Tin, Through-Hole
Sullins Connector Solutions
PPTC081LFBN-RC Wurth Elektronik 61300811821
2 J10, J13 Connector Header-2.54 Male, 1x2, Gold, 5.84MH, TH, Vertical
FCI 77311-118-02LF Wurth Elektronik 61300211121
2 _J10, _J13 Mechanical Hardware Jumper Cap, 2.54 mm, 1x2
3M 969102-0000-DA Wurth Elektronik 60900213421
2 J11, J12 Connector Header-2.54 Female, 2x18, 0.100" Pitch, Gold, TH
Samtec, Inc. SSW-118-01-G-D Wurth Elektronik 61303621821
2 J16, J20 Connector USB 2.0 micro-B Female, TH/SMD, R/A
FCI 10118194-0001LF Wurth Elektronik 629105136821
1 J18 Connector Header-2.54 Female, 2x5, 0.100", Gold, TH
Samtec, Inc. SSQ-105-02-G-D Wurth Elektronik 61301021821
1 J21 Connector Screw Terminal, 5 mm, 1x2, Female, 12-26AWG, 18A, TH, R/A
Phoenix Contact GmbH & Co.
1935161 Wurth Elektronik 691102710002
4 S1, S2, S3, S4 Switch Tact, SPST, 12V, 50 mA, PTS645SM43SMTR92 LFS, SMD
C&K Components
PTS645SM43SMTR92 LFS Wurth Elektronik 430182043816
4 PAD1, PAD2, PAD3, PAD4
Mechanical Hardware Rubber Pad, Bumpon Hemisphere, 0.44" x 0.20", Black
3M SJ-5003 (BLACK)
1 TH1 PTC Resettable, 0.50A, 16V, Chip, 1210
Bel Fuse Inc. 0ZCB0050FF2G
1 U11 Digital ISO, 2.5KV, General Purpose, 8-SOIC
Silicon Laboratories® Inc.
SI8422AB-D-IS
TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS (CONTINUED)
Qty. Designator Description Mfg. 1 Mfg. 1 Part # Mfg. 2 Mfg. 2 Part #
DS50002762A-page 28 Advance Information 2018 Microchip Technology Inc.
Bill of Materials (BOM)
1 U5 IC Logic Gate, UHS, 2-INP, SC70-6
Fairchild Semiconductor®/ON Semiconductor
NC7SZ57P6X
1 U10 IC Logic Gate, UHS, 2-INP, SC70-6
Fairchild Semiconductor/ON Semiconductor
NC7SZ58P6X
1 U1 dsPIC33CH128MP508, TQFP-80
Microchip Technology Inc.
dsPIC33CH128MP508-I/PT
1 U4 Microchip MCU, 16-Bit, 32 MHz, 256 kB, 16 kB, PIC24FJ256GB106-I/PT, TQFP-64
Microchip Technology Inc.
PIC24FJ256GB106-I/PT
1 U6 Microchip Memory Serial EEPROM, 256k, SPI, 25LC256-I/SN, SOIC-8
Microchip Technology Inc.
25LC256T-I/SN
1 U7 Microchip Analog Op Amp, 2-Ch, 10 MHz, MCP6292T-E/MS, MSOP-8
Microchip Technology Inc.
MCP6292T-E/MS
1 U8 Microchip Analog Op Amp, 1-Ch, 1 MHz, MCP6001T-I/OT, SOT-23-5
Microchip Technology Inc.
MCP6001T-I/OT
1 U9 Microchip Interface, USB, I2C, UART, MCP2221A-I/ST, TSSOP-14
Microchip Technology Inc.
MCP2221A-I/ST
1 U12 MIC5528-3.3 Linear Voltage Regulator IC, Positive, Fixed, 1 Output, 3.3V, 500 mA, 6-TDFN (1.2x1.2)
Microchip Technology Inc.
MIC5528-3.3YMT-TR
1 X1 MEMS Oscillator, 8.0000 MHz, 2.5x2.0 mm
Microchip Technology Inc.
DSC6011JI1A-008.0000
1 X3 MEMS Oscillator, 12.0000 MHz, 2.5x2.0 mm
Microchip Technology Inc.
DSC6011JI1A-012.0000
Do Not Populate Parts Listed Below
3 C38, C45, C52 Unpopulated pad
3 C43, C44, C46 Unpopulated pad
2 D1, D7 Unpopulated pad
3 J1, J14, J19 Unpopulated pad
2 J2, J15 Unpopulated pad
1 J9 Unpopulated pad
1 J17 Unpopulated pad
7 R21, R22, R69, R71, R78, R81, R86
Unpopulated pad
4 R39, R40, R41, R43 Unpopulated pad
1 TP5 Unpopulated pad
1 X2 Unpopulated pad
TABLE B-1: dsPIC33CH CURIOSITY DEVELOPMENT BOARD BILL OF MATERIALS (CONTINUED)
Qty. Designator Description Mfg. 1 Mfg. 1 Part # Mfg. 2 Mfg. 2 Part #
2018 Microchip Technology Inc. Advance Information DS50002762A-page 29
DS50002762A-page 30 Advance Information 2018 Microchip Technology Inc.
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Worldwide Sales and Service
10/25/17