ISP1302 USB OTG carkit transceiver with 50-mA charge pump ISP1302 ISP1302 Flexible, cost-effective solution for adding USB functionality to mobile phones that support carkit and OTG applications. Key features • Fully complies with - Universal Serial Bus Specification Rev. 2.0 - On-The-Go Supplement Rev. 1.0a - On-The-Go Transceiver Specification (CEA-2011) - Mini-USB Analog Carkit Interface (CEA-936-A) • Full-speed (12 Mbps) and low-speed (1.5 Mbps) data transfer rates • Built-in analog switches support analog audio signals multiplexed on D+ and D– lines • I 2 C-bus interface (up to 400 kHz) • Designed for low power • Supports OTG HNP and SRP - Power-down mode (< 20 μA) • Flexible power-supply input (3.0 to 4.5 V) • Wide range for digital interface I/O voltage (1.65 to 3.6 V) • Small halogen- and lead-free HVQFN24 package (4x4 mm 2 ) Applications • Mobile phones that support carkit and OTG applications • Other handheld applications (digital still camera, PDA, etc.) The ISP1302 Universal Serial Bus (USB) On-The-Go (OTG) transceiver lets basebands and processors that have a USB OTG core interface with the USB physical layer. With support for the Mini-USB Analog Carkit Interface (CEA-936-A) standard, the ISP1302 makes it easy to add carkit support to mobile phones with USB functionality. The ISP1302 is fully compliant with Universal Serial Bus Specification Rev. 2.0, On-The-Go Supplement Rev. 1.0a, and On-The-Go Transceiver Specification (CEA-2011). It supports full-speed (12 Mbps) and low-speed (1.5 Mbps) data transfer rates. Carkit support Carkits enable hands-free operation of a mobile phone. Connected directly to the phone or installed in a car stereo, they typically contain a speaker and a microphone, and draw current from the car’s power adapter. The simplest, most cost-effective way to connect a carkit to a phone is via the USB interface. The USB connector can be used for digital data and multiplexed analog audio, so there’s no need to modify the phone design for carkit application. The ISP1302 includes audio bypass circuitry, consisting of built-in switches that support analog audio signals multiplexed on the D+ and D- lines, plus the necessary DC biasing circuits. For more advanced carkit applications, such as caller ID display, the ISP1302 also supports data-during-audio operation - that is, transferring Universal Asynchronous Receiver-Transmitter (UART) data bytes between the phone and the carkit without interrupting the call. The phone processor typically operates at 2.5 V, while the D+ and D- lines operate at 3.3 V. With this much voltage difference, care must be taken to avoid damaging the phone processor. The ISP1302 has a built-in level shifter that protects the processor from voltage differences. Stand-alone Carkit implementation Car stereo implementation
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ISP1302USB OTG carkit transceiver with 50-mA charge pump
ISP1302ISP1302
Flexible, cost-effective solution for adding USB functionality
to mobile phones that support carkit and OTG applications.
Key features
• Fully complies with
- Universal Serial Bus Specifi cation Rev. 2.0
- On-The-Go Supplement Rev. 1.0a
- On-The-Go Transceiver Specifi cation (CEA-2011)
- Mini-USB Analog Carkit Interface (CEA-936-A)
• Full-speed (12 Mbps) and low-speed (1.5 Mbps) data transfer rates
• Built-in analog switches support analog audio signals multiplexed
on D+ and D– lines
• I2C-bus interface (up to 400 kHz)
• Designed for low power
• Supports OTG HNP and SRP
- Power-down mode (< 20 μA)
• Flexible power-supply input (3.0 to 4.5 V)
• Wide range for digital interface I/O voltage (1.65 to 3.6 V)
• Small halogen- and lead-free HVQFN24 package (4x4 mm2)
Applications
• Mobile phones that support carkit and OTG applications
• Other handheld applications (digital still camera, PDA, etc.)
The ISP1302 Universal Serial Bus (USB) On-The-Go (OTG)
transceiver lets basebands and processors that have a USB OTG core
interface with the USB physical layer. With support for the Mini-USB
Analog Carkit Interface (CEA-936-A) standard, the ISP1302 makes it
easy to add carkit support to mobile phones with USB functionality.
The ISP1302 is fully compliant with Universal Serial Bus Specifi cation
Rev. 2.0, On-The-Go Supplement Rev. 1.0a, and On-The-Go Transceiver
Specifi cation (CEA-2011). It supports full-speed (12 Mbps) and
low-speed (1.5 Mbps) data transfer rates.
Carkit support
Carkits enable hands-free operation of a mobile phone.
Connected directly to the phone or installed in a car stereo, they
typically contain a speaker and a microphone, and draw current from
the car’s power adapter.
The simplest, most cost-effective way to connect a carkit to a phone
is via the USB interface. The USB connector can be used for digital
data and multiplexed analog audio, so there’s no need to modify the
phone design for carkit application. The ISP1302 includes audio bypass
circuitry, consisting of built-in switches that support analog audio
signals multiplexed on the D+ and D- lines, plus the necessary DC
biasing circuits.
For more advanced carkit applications, such as caller ID display,
the ISP1302 also supports data-during-audio operation - that is,
transferring Universal Asynchronous Receiver-Transmitter (UART) data
bytes between the phone and the carkit without interrupting the call.
The phone processor typically operates at 2.5 V, while the D+ and
D- lines operate at 3.3 V. With this much voltage difference, care must
be taken to avoid damaging the phone processor. The ISP1302 has a
built-in level shifter that protects the processor from voltage differences.
Stand-alone Carkit
implementation
Car stereo
implementation
Philips SemiconductorsPhilips Semiconductors is one of the world’s top semiconductor suppliers, with 20 manufacturing and assembly sites and a sales organization that delivers in 60 countries. For a complete up-to-date list of our sales offices please visit our website http://www.semiconductors.philips.com/sales
©2005 Koninklijke Philips Electronics N.V.All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliableand may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
date of release: September 2005document order number: 9397 750 15541Printed in the Netherlands
To save power in OTG peripherals, the transceiver supports OTG
Session Request Protocol (SRP). The host and peripheral controllers
can both be powered down while the USB function is idle; the SRP is
activated only when a peripheral requires a USB session. For additional
power savings, the transceiver offers a power-down mode that
consumes no more than 20 μA.
For easy access to the phone’s control and status registers, the ISP1302
supports the I2C-bus (Inter-IC bus) at up to 400 kHz. The transceiver
accepts power supply inputs from 3.0 V to 4.5 V, supports digital
interface I/O voltages from 1.65 to 3.6 V. ESD protection of ±12 kV
is provided on the D+, D-, ID, VBUS, and GND pins. The transceiver
provides full industrial-grade operation (-40°C to +85°C) and is
available in a small, halogen- and lead-free HVQFN24 package that
measures only 4x4 mm2.
Block diagram of ISP1302
DGND
OE_N/INT_N
SE0/VM
DAT/VP
INT_N
SCL
RESET_N
SDA
ADR/PSW
RCV
SERVICE_N
VCC(I/O) CBCAVCCVREG
SPKR_R/MIC
SPKR_L
DM
DP
BUS
ID
CGND
CR_INT
V
ISP1302
ID Detector
19
24
18
23
21 22207
6
4
5
2
3
13
14
9
1
12
8
Level Shifter
DIF TX
DIF RX
SED+
SED–
10
11
16
15
die pad17
SE Detector
AGND
Clock andTimer
3.3V DC-DCRegulator
VBUSCharge Pump
VBUSComparator
SerialController
CarkitInterruptDetector
AudioData
Control
Pull-up andPull-downResistors
AudioBypass
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