220.127.116.11 Using Multiple Devices With Shared Buses
The device has many supported features and flexible options that can be used in the system to seamlessly connect multiple PCM6xx0-Q1 devices by sharing a single common I2C control bus and an audio serial interface bus. This architecture enables multiple applications to be applied to a system that require a microphone array for beam-forming operation, hands-free in-vehicle communication, car cabin active noise cancellation, and so forth. Figure 36 shows a diagram of multiple PCM6xx0-Q1 devices in a configuration where the control and audio data buses are shared.
Figure 36. Multiple PCM6xx0-Q1 Devices With Shared Control and Audio Data Buses
The PCM6xx0-Q1 consist of the following features to enable seamless connection and interaction of multiple devices using a shared bus:
- Supports up to four pin-programmable I2C slave addresses
- I2C broadcast simultaneously writes to (or triggers) all PCM6xx0-Q1 devices
- Supports up to 64 configuration output channel slots for the audio serial interface
- Tri-state feature (with enable and disable) for the unused audio data slots of the device
- Supports a bus-holder feature (with enable and disable) to keep the last driven value on the audio bus
- The GPIOx pin can be configured as a secondary output data lane for the audio serial interface
- The GPIOx or GPIx pin can be used in a daisy-chain configuration of multiple PCM6xx0-Q1 devices
- Supports one BCLK cycle data latching timing to relax the timing requirement for the high-speed interface
- Programmable master and slave options for the audio serial interface
- Ability to synchronize the multiple devices for the simultaneous sampling requirement across devices
See the Multiple PCM6xx0-Q1 Devices With Shared TDM and I2C Bus application report
for further details.