The device has many supported features
and flexible options that can be used in the system to seamlessly connect the PCM3120-Q1 and any other audio device 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 operations, audio conferencing, noise cancellation, and so
forth. Figure 8-13 shows a
diagram of the PCM3120-Q1 and PCMx140-Q1 devices in a configuration
where the control and audio data buses are shared.
Figure 8-13 Multiple
Devices With Shared Control and Audio Data Buses
The PCM3120-Q1 consists
of the following features to enable seamless connection and interaction of multiple
devices using a shared bus:
I2C broadcast
simultaneously writes to (or triggers) all PCM3120-Q1 and
PCMx140-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 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 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