EVAL-ADPD4000Z-PPG User Guide - analog.com · Wavetool Evaluation Software. is connected via the USB cable to the evaluation setup. Select the proper COM port found in the dropdown

EVAL-ADPD4000Z-PPG User Guide UG-1529

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluating the ADPD4000/ADPD4001 Multimodal Front End

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 14

FEATURES Board supports ADPD4000 and ADPD4001 population ADPD4000 (SPI) is the default board population All inputs and outputs are accessible to the user 3 separately driven green LEDs included 1 red and 1 IR LED included Metal baffle to block optical crosstalk Works with the Wavetool Evaluation Software allowing

Time domain graphing and logging Frequency domain graphing Statistical analysis Data streaming to other applications

EVALUATION KIT CONTENTS EVAL-ADPD4000Z-PPG evaluation board Ribbon cable Wrist strap, with hook and loop fastener

ADDITIONAL EQUIPMENT NEEDED PC running Windows® 7 or Windows 10 operating system EVAL-ADPDUCZ, Cortex-M4 microcontroller motherboard Optional: EVAL-ADPDM3Z, alternative Cortex-M3

microcontroller motherboard (available from the EVAL-ADPD2140Z product page)

ONLINE RESOURCES ADPD4000/ADPD4001 data sheet Wavetool Evaluation Software package

GENERAL DESCRIPTION The EVAL-ADPD4000Z-PPG evaluation board provides users with a simple means of evaluating the ADPD4000/ADPD4001 photometric front end.

The EVAL-ADPD4000Z-PPG evaluation board implements a simple discrete optical design for vital signs monitoring applica-tions, specifically wrist-based photoplethysmography (PPG).

The EVAL-ADPD4000Z-PPG has three green light emitting diodes (LEDs), one infrared (IR), and one red LED, all separately driven. A single 7 mm2 photodiode (PD) is populated on the board. The PD has no optical filter coating. However, a pin for pin alternative device with an IR block filter is available.

The full evaluation system includes the Wavetool Evaluation Software graphical user interface (GUI) that provides users with low level register access and high level system configurability. Raw data streamed to this tool can be displayed in real time with limited latency. Views are provided for both frequency and time domain analysis.

A user datagram protocol (UDP) transfer capability from the Wavetool Evaluation Software (available for download on the EVAL-ADPD4000Z-PPG product page) allows data stream connections and register configurability to external analysis programs, such as LabVIEW® or MATLAB®, in real time.

The EVAL-ADPD4000Z-PPG board is powered by the EVAL-ADPDUCZ microcontroller board (obtained from the EVAL-ADPD4000Z-PPG product page). In addition to the power requirements, serial port interface (SPI) (default) or I2C data streams are received from the ADPD4000 by the microcontroller. A ribbon cable connects the two boards. The microcontroller repackages the data, sending it to a virtual serial port over the USB to the PC, displayed on the Wavetool Evaluation Software. The EVAL-ADPD4000Z-PPG can also be connected directly to the microcontroller development system of the user, using the SPI for the ADPD4000 (or I2C for the ADPD4001).

The ADPD4000/ADPD4001 data sheet, available at www.analog.com, provides full specifications for the ADPD4000/ADPD4001. Consult the ADPD4000/ADPD4001 data sheet in conjunction with this user guide when using the EVAL-ADPD4000Z-PPG.

https://www.analog.com/ADPD4000?doc=EVAL-ADPD4000Z-PPG-UG-1529.pdf





https://www.analog.com/EVAL-ADPD4000z-ppg?doc=EVAL-ADPD4000Z-PPG-UG-1529.pdf



https://www.analog.com/EVAL-ADPD2140Z?doc=EVAL-ADPD4000Z-PPG-UG-1529.pdf



http://www.analog.com/ADPD4000?doc=EVAL-ADPD4000Z-PPG-UG-1529.pdf

















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UG-1529 EVAL-ADPD4000Z-PPG User Guide

Rev. 0 | Page 2 of 14

TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Kit Contents ................................................................... 1 Additional Equipment Needed ....................................................... 1 Online Resources .............................................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Evaluation Board Photographs ....................................................... 3 Getting Started .................................................................................. 4

Install the Wavetool Evaluation Software.................................. 4

Connecting the EVAL-ADPDUCZ to the EVAL-ADPD4000Z-PPG Board .............................................................4 Starting the Wavetool Evaluation Software ...............................5 USB UART Connection................................................................5 Select the Proper View ..................................................................5 Loading the Device Configuration .............................................6 Starting Real-Time Graphing ......................................................7 Optimizing and Running the ADPD4000 and ADPD4001 .....7

Evaluation Board Schematics and Artwork ...................................8

REVISION HISTORY 6/2019—Revision 0: Initial Version




EVALUATION BOARD PHOTOGRAPHS

Figure 1. EVAL-ADPD4000Z-PPG Top Side

Figure 2. EVAL-ADPD4000Z-PPG Bottom Side, Optical

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GETTING STARTED INSTALL THE WAVETOOL EVALUATION SOFTWARE Download the Wavetool Evaluation Software package from the EVAL-ADPD4000Z-PPG product page.

Version 2.1.x or later of the Wavetool Evaluation Software is required to work with this evaluation board. It is recommended to download the latest version from the Wavetool Evaluation Software link.

Unzip the downloaded folder, if required, and run the Wavetool Evaluation Software executable file. Some users have found that they must install the tool as the administrative user or run Windows in elevated mode to ensure drivers are properly downloaded during the installation.

Follow the prompts, beginning with the setup window shown in Figure 3 for software installation.

Figure 3. Wavetool Evaluation Software, Installer Window

A click through licensing window appears during installation of the Wavetool Evaluation Software package. The terms of the license must be read and accepted to install the package.

If the default directory was selected in the installation, for example, C:\Analog Devices\ADI_ApplicationsWaveTool-Rel2.1.5, the executable file is then found in the top level directory (note that the version number may be different) and named Applications Wavetool.exe. Run this file directly, or create and place a shortcut on the desktop.

Note that there is a full help utility included in the Wavetool Evaluation Software, as well as links to videos and other documentation in the Wavetool Evaluation Software library showing how to use the tool (see Figure 4).

Figure 4. Wavetool Evaluation Software, Getting Help

CONNECTING THE EVAL-ADPDUCZ TO THE EVAL-ADPD4000Z-PPG BOARD Connect the keyed gray ribbon cable between the EVAL-ADPD4000Z-PPG board and the EVAL-ADPDUCZ Cortex-M4 micro-controller motherboard.

Connect the USB cable between the EVAL-ADPDUCZ evaluation motherboard and the PC. Use the USB miniconnector on the short side of the board as shown in Figure 5. After connection, turn the white slider power switch to the on position (see Figure 5). If the switch is already on, toggle the power switch to off, wait 3 sec, then toggle the switch back on again.

When the USB cable is connected from the EVAL-ADPDUCZ back to the PC, the second LED below the power switch illumi-nates, indicating that the on-board battery is being charged from the PC. When the power switch is turned to the on position, the LED immediately below the power switch illuminates, indicating that the EVAL-ADPDUCZ Cortex-M4 microcontroller is also on.

Figure 5. Connect the EVAL-ADPDUCZ to the EVAL-ADPD4000Z-PPG

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UPGRADE USBMICRO PORT

RIBBONCABLECONNECTOR(KEYED)

M4 MOTHERBOARD

POWER ON SWITCH(OFF IS SHOWN)

EVAL-ADPD4000Z-PPG

USB MINICONNECTORFOR DATA PATH

BOOTMODE(UPGRADE)

RESET

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The USB microconnector on the long side of the board is only used for firmware upgrades for the EVAL-ADPDUCZ board.

Figure 6 shows the stretch wrist strap that is shipped with the EVAL-ADPD4000Z-PPG board.

Figure 6. Optional Wrist Strap on EVAL-ADPD4000Z-PPG

Figure 7 shows the connectivity of the EVAL-ADPD4000Z-PPG board to the EVAL-ADPDM3Z Cortex-M3 microcontroller motherboard. The EVAL-ADPDM3Z is an alternative microcontroller typically used for demonstration purposes in smaller form factor situations.

Figure 7. Connecting the EVAL-ADPDM3Z to the EVAL-ADPD4000Z-PPG

STARTING THE WAVETOOL EVALUATION SOFTWARE After the Wavetool Evaluation Software is installed and the EVAL-ADPDUCZ Cortex-M4 microcontroller motherboard and the EVAL-ADPD4000Z-PPG board are connected to the PC, the user can start the Wavetool Evaluation Software.

The executable file is Applications Wavetool.exe found in the appropriate installation directory as described in the Install the Wavetool Evaluation Software section.

USB UART CONNECTION To establish the software connection between the Wavetool Evaluation Software and the evaluation board firmware, select a connection to the specific UART port used by the EVAL-ADPDUCZ Cortex-M4 microcontroller.

Click the green circular Connect icon (see Figure 8) and choose the specific COM port from the list.

Figure 8. Connect to the PC COMx Port

For this example, the PC running the Wavetool Evaluation Software is connected via the USB cable to the evaluation setup. Select the proper COM port found in the dropdown list to connect the Wavetool Evaluation Software to the device.

If connection via Bluetooth® or Bluetooth low energy (BLE) is required, or if there are any other connection issues, refer to the Wavetool Evaluation Software user guide that is provided via the Help icon from within the software package (see Figure 4).

SELECT THE PROPER VIEW After the COM port connection is established, an EEPROM on the evaluation board is read so that the Wavetool Evaluation Software can determine what type of evaluation board it is communicating to. Look at the bottom line of the window in Figure 9.

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M3MOTHERBOARD

EVAL-ADPD4000Z-PPGEVAL BOARD

STACKINGCONNECTORS

RESET

USBTYPE C

BUTTON BBOOTMODE(UPGRADE)

BUTTON AFORCE BLEMODE

M3 MOTHERBOARD ANDEVAL-ADPD4000Z-PPG EVAL BOARD

MOUNTED TOGETHER

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The text states: Connected on USB COM17 to OPL ADPD4000 family (S). The (S) indicates SPI connection, whereas the (I) indicates an I2C connection.

For a specific evaluation board, various application modes and sensor devices are displayed (see Figure 9).

Figure 9. Select Sensor to Open ADPD Device Window

In the Sensors section, select the ADPD400x sensor to open the window shown in Figure 10 for the EVAL-ADPD4000Z-PPG. If ECG leads are connected to this evaluation board, select the ECG application within the Applications section, which is a specific mode of operation for the EVAL-ADPD4000Z-PPG.

If more information is required about any of the demonstration applications, refer to the Wavetool Evaluation Software user guide provided via the Help icon from within the software package.

LOADING THE DEVICE CONFIGURATION In the upper left corner of the ADPD Device window, click the gear icon (see the red box in Figure 10) to open the ADPD Config window (see Figure 10 insert).

Load the device configuration file for the ADPD4000 or ADPD4001 device. The Wavetool Evaluation Software provides specific device configurations that may be suitable for the experimental requirements of a user. These device configuration files are *.dcfg extension files.

Select the file from one of two file folder icons in the upper left of the ADPD Config window. The first folder (see the blue box in Figure 10) shows local copies of the device configuration file. The folder in the green box shows consistently updated files found remotely in the cloud.

For this example of PPG measurements, select the configuration file that can be found in both the remote and local folders.

Figure 10. Connect to the PC COMx Port

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STARTING REAL-TIME GRAPHING When the ADPD4000 or ADPD4001 device is configured, data can be read from the EVAL-ADPD4000Z-PPG. The ADPD4000 and ADPD4001 allow data to be collected in sequential, time division multiplex (TDM). To observe the data, select the appropriately configured time slot.

In this example, the configuration loaded is ADPD4000_ defaultABC_test.dcfg and configures three separate time slots. SLOT_A uses the three green LEDs, SLOT_B uses the red LED, and SLOT_C uses the IR LED. All the slots are configured to run and use the same photodiode input.

Select two of the time slots to display from the slot selection dropdown menus in the ADPD Device window. Figure 10 shows the data for SLOT_A and SLOT_B. After selecting the appropriate slots, click the play button (the small triangular black icon) in the menu bar in the upper left side of the ADPD Device window.

Clicking play causes data from the selected slots to be streamed to the PC and displayed. The red and green LEDs on the EVAL-ADPD4000Z-PPG are now lit (the IR LED is also lit, but cannot be seen).

Shown in the graphs of Figure 10 is an example of a PPG signal measured from a finger pressed lightly to the metal disk surface covering the photodiode and the LEDs. Note that a wait of several seconds may be needed for the waveform to stabilize while maintaining a light but consistent finger contact.

It is possible, using the Wavetool Evaluation Software, to save the raw data to a comma separated values (.csv) file that can be read easily into Excel®. Explore the icons in the ADPD Device window. Pop up tool tips text provide explanations of icon functions

OPTIMIZING AND RUNNING THE ADPD4000 AND ADPD4001 After the configuration file is loaded, the settings can be further optimized using the ADPD Config window shown in the insert in Figure 10. Typically, the device is set up under conditions, for example, measuring the response from a fixed reflector or measuring a PPG signal from the wrist or finger.

Settings can be optimized for any set of conditions by manip-ulating LED drive currents, transimpedance amplifier (TIA) gain, and analog front-end (AFE) timing, or by using different operating modes that may be more optimal for a specific set of measurements, for example, using float mode for very low current transfer ratio (CTR).

For information on optimization of the ADPD4000 and ADPD4001, refer to the ADPD4000/ADPD4001 data sheet.

For functional descriptions of the Wavetool Evaluation Software, and some of the application demonstration modes, refer to the Wavetool Evaluation Software itself. The wavetool provides links to videos and additional software documentation within its help utility (see Figure 4).





















EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 11. EVAL-ADPD4000Z-PPG Schematic, Page 1

PPG PHOTODIODE

OPEN INPUTPOTENTIAL REF IN

IMPEDANCE

TO IMPEDANCE INPUTS

R9 NORMALLY 0 OHM

ECG IN

R27 OM PINS 1-2 FOR SPI

R25 OVERLAP WITH JP11 PINS 2-3 FOR I2CR25 OM PINS 1-2 FOR SPI

R27 OVERLAP WITH JP10 PINS 2-3 FOR I2C

OVERLAP DUAL FOOTPRINT

R16 OVERLAP WITH JP2

DEFAULT 1.8V IO

LEDS

U3 RED AND IR LED

R19 OVERLAP WITH JP6

ADXL362BCCZ

ADPD4000/ADPD4001

D2 AND D1 ARE

SHORT WITH 0 OHM FOR NORMAL OPERATION

FOR ONE SPLIT DRIVER POPULATE JP4, JP5 PINS 1-2

ALLOWS DIFFERENTIAL PD ON PIN 2-3OR VC1 DRIVEN PD ON PINS 1-2

POPULATION OF R32 ON JP1

SHORT 2-3 WITH R33, R34, 0 OHM FOR NORMAL OPERATION

R19 NORMALLY 0 OHM

R18 NORMALLY 0 OHM

R19 R9 AND R18 SHOW SUGGESTED VALUES FOR CURRENT MEASUREMENT

TP1A AND TP1B ARE FOR BAFFLE PEM NUT HOLES

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CONN1_SPI1_MISO/P1_8LEDX4B

GND_LOCAL

GND_LOCAL

DUT_CS_N_ADXL

LEDX3B

VDD_3V

VDD_1.8V

CONN1_WAKE1/P1_0

ACCEL_TRIGGER

CONN1_TMR0_OUT/P0_14

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Figure 12. EVAL-ADPD4000Z-PPG Schematic, Page 2

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VD

D_1

.8V

_LD

O2

CO

NN

1_W

AK

E1/

P1_

0

DU

T_C

S_N

_AD

XL

VD

D_1

.8V

VD

D_1

.8V

GN

D_L

OC

AL

GN

D_L

OC

AL

GN

D_L

OC

AL

VD

D_3

V

CO

NN

2_B

PR

0_TO

NE

_N/P

0_8

CO

NN

1_W

AK

E1/

P1_

0

VD

D_1

.8V

VD

D_1

.8V

7

4

8 56321

2 31

2

6 4 1

3

5

2 31

191715131197531

2018161412108642

161412108642

15131197531

2018161412108642

191715131197531

NC

NC

NC

VS

SS

CL

SD

A

WC

_NV

CC

BCO

MA

BCO

MA

S1

D

VD

D

S2

GN

DIN

BCO

MA

20180-012




Figure 13. Component: Top Layer and Silkscreen

Figure 14. Layer 2, Ground

2018

0-01

320

180-

014




Figure 15. Layer 3, Power

Figure 16. Layer 4, Inner Signal

2018

0-01

520

180-

016




Figure 17. Layer 5, Ground

Figure 18. Bottom Layer, Opticals

2018

0-01

720

180-

018




Figure 19. EVAL-ADPD4000Z-PPG Layout, Bottom Layer, Inverted Silkscreen View

2018

0-01

9




Figure 20. EVAL-ADPD4000Z-PPG, Jumpers and Connectors

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

GPIO

INPU

TS

I2C (1.8V)

EXTERNALLEDS

ECG

IMPEDANCE

SPARE

GROUND POINTS

GROUND CONNECTION FORMETAL BAFFLEPOINTS

DATA CONFIGURATION JUMPERSSPI SELECTED

SEPARATE DRIVES SELECTED

GREEN LED DRIVER CHOICE

3.3V OR 1.8V IO VOLTAGE CHOICE

1.8V SELECTED

PHOTODIODE CONNECT VC1 OR DIFFERENTIALVC1 SHOWN SELECTED

MOUNTING HOLES AND STRAP SLOTS

2018

0-02

0

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

©2019 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG20180-0-6/19(0)


https://www.analog.com/?doc=eval-adpd4000z-ppg-ug-1529.pdf

EVAL-ADPD4000Z-PPG User Guide - analog.com · Wavetool Evaluation Software. is connected via the USB cable to the evaluation setup. Select the proper COM port found in the dropdown

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