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 I2S/TDM to I2S/TDM

Clock synchronous, phase aligned in all nodes

Low latency node to node communication

Control and status information I2C to I2C

GPIO over distance

Bus power or local power subordinate nodes

Configurable with SIgmaStudio/SigmaStudio+ graphical

software tool

AEC-Q100 qualified for automotive applications

BASELINE A2B TRANSCEIVER FEATURES

Configurable as A2B bus main node or subordinate node

Programmable via I2C and SPI interfaces

8-bit to 32-bit multichannel I2S/TDM interface

I2S/TDM/PDM programmable data rate

Up to 32 upstream and 32 downstream channels

PDM inputs for 4 high dynamic range microphones on main

or subordinate nodes

Simultaneous I2S/TDM operations 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

AD243x TRANSCEIVER ENHANCEMENTS

Mixed Signal

Up to 50 W A2B bus power

Increased voltage regulator capacity (up to 100 mA)

ADC monitoring of supply voltages

Supports 3.3 V input at VIN in Low Voltage Input (LVI)

mode

Digital

High speed SPI (up to 10 Mbps) over distance

A2B bus self-discovery

Dedicated hardware reset pin

I2S/TDM crossbar switch

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

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

APPLICATIONS

Distributed audio systems

Personal audio zones

In car communications

Smart/remote tuner modules