A2B BUS FEATURES
Line topology
Single master, multiple slave
Up to 15 m between nodes and up to 40m overall cable length
Communication over distance
Synchronous data
Multichannel I2S/TDM to I2S/TDM
Synchronous clock, phase aligned in all nodes
Low latency slave to slave communication
Control and status information I2C to I2C
GPIO and interrupt
Bus power or local power slave nodes
Configurable with SigmaStudio graphical software tool
AEC-Q100 qualified for automotive applications
A2B TRANSCEIVER FEATURES
Configurable A2B bus master or slave operation
I2C interface
8-bit to 32-bit multichannel I2S/TDM interface
Programmable I2S/TDM data rate
Up to 32 upstream and 32 downstream channels
PDM interface
Programmable PDM clock rate
Up to 4 high dynamic range microphone inputs
Simultaneous reception of I2S data with up to 4 PDM microphones
Unique ID register for each transceiver
Crossover or straight-through cabling
Programmable settings to optimize EMC performance

The Automotive Audio Bus (A2B®) provides a multichannel, I2S/TDM link over distances of up to 15 m between nodes. It embeds bidirectional synchronous pulse-code modulation (PCM) data (for example, digital audio), clock, and synchronization signals onto a single differential wire pair. A2B supports a direct point to point connection and allows multiple, daisy-chained nodes at different locations to contribute and/or consume time division multiplexed (TDM) channel content.

A2B is a single-master, multiple-slave system where the transceiver at the host controller is the master. The master generates clock, synchronization, and framing for all slave nodes.

Parameter Name	Parameter Value
Network	Ethernet
Applications	audio
Other characteristics	data analog bidirectional programmable