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Automotive Audio Bus (A2B) Transceiver

AD2430/AD2438

Rev. Sp0

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A2B BUS FEATURES

Line topology

Single main node, up to 16 subordinate nodes

Up to 15 m between nodes and up to 80 m overall cable

length

Communication over distance

Synchronous data

Multichannel I

2S/TDM to I2S/TDM

Clock synchronous, phase-aligned in all nodes

Low latency subordinate-to-subordinate

communication

Control and status information I2C to I2C

GPIO over distance

Bus power or local power subordinate nodes

Configurable with SigmaStudio+ graphical software tool

AEC-Q100 qualified for automotive applications

BASELINE A2B TRANSCEIVER FEATURES

Configurable as A

2B main or last subordinate nodes

Programmable via I

2C interface

8-bit to 32-bit multichannel I

2S/TDM interface

I2S/TDM/PDM programmable data rate

I2C mailbox

PDM inputs for 4 high dynamic range microphones on main

or subordinate nodes

Support for receiving I

2S/TDM data on nodes with up to

4 PDM microphones

Unique ID register for each transceiver

Support for crossover or straight-through cabling

Programmable settings to optimize EMC performance

AD2430/AD2438 TRANSCEIVER ENHANCEMENTS

Cable diagnostics with integrated line power switches

Supports 3.3 V input at VIN in low voltage input (LVI) mode

for local powered subordinate node

Dedicated hardware reset pin

I2S/TDM crossbar switch

Flexible mapping of Tx/Rx TDM channel data to A2B slots

Support for I2C fast mode plus (1 MHz)

Support for in-cabin LED control using 4 PWM outputs

8 GPIO pins with configurable pin mapping

AUTOMOTIVE APPLICATIONS

Hands free/speech recognition

Microphone arrays

In-car telematics and emergency call systems

Overhead consoles

In-car communications

Figure 1. Functional Block Diagram

TRX

LINE DIAGNOSTICS

WITH INTEGRATED

SWITCHES

PWM

I2C

PLL

VREG1

VREG2

I2S / TDM

PDM

GPIO

IRQ