8.3.1.3 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 TLV320ADC6140 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, audio conferencing, noise cancellation, and so forth. Figure 35 shows a diagram of multiple TLV320ADC6140 devices in a configuration where the control and audio data buses are shared.

The TLV320ADC6140 consists 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 TLV320ADC6140 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 GPIO1 or GPOx pin can be configured as a secondary output data lane for the audio serial interface
• The GPIO1 or GPIx pin can be used in a daisy-chain configuration of multiple TLV320ADC6140 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 TLV320ADCx140 Devices With a Shared TDM and I²C Bus application report for further details.