Overview
The Automotive Audio Bus provides a multichannel, I 2 S/TDM link over distances of up to 10 meters between nodes. It embeds bidirectional synchronous data, clock, control data, and a power supply onto a single, differential wire pair. A2 B supports a direct point-to-point connection and allows multiple daisy-chained nodes at different locations to contribute or consume time division multiplexed chan- nel content. A2 B is a single master, multiple slave system where the transceiver chip at the host controller is the master. It generates clock, synchronization, and framing for all slave nodes. The master A2 B chip is programmable over a control bus (I 2 C) for configuration and readback. An extension of this control bus is embedded in the A2 B data stream, allowing direct access of registers and status information on slave transceivers as well as I 2 C-to-I 2 C communication over distance.
Target Applications Include
- Audio ECU communication links
- Active noise cancellation (ANC)
- Microphone arrays for hands-free and in-car communications systems
Hands-Free and ANC: Two Approaches
- Traditional approach: analog audio; many expensive cables and connectors.
- New approach: digital audio; single, low cost, unshielded twisted pair (UTP) wire transports audio, control, clock, and power.
Features and Benefits
SigmaStudio Graphical Design Environment
- Visual bus setup and configuration
- Graphical user interface to view and configure all registers
- Bus bandwidth utilization calculation
- Bit error rate test (BERT)
- Line diagnostics
- Firmware driver generation
Multifunction Evaluation Systems
- Proof of concept
- Test and verification
- Debug, EMC testing
Product Comparison Guide
Ordering Guide
1 Z = RoHS compliant part.
2 W = qualified for automotive applications.
