1 ms

SET_INTERFACE

Audio Data

IN Token

Audio Data

IN Token

Audio Data

IN Token

SOF

SOF

SOF

SOF

SOF

D+/D-

V L

V R

IN

IN

5 ms

Idle

Active

Active

Suspend

D+/D-

SSPND

PCM2900C

PCM2902C

www.ti.com

SBFS039

– SEPTEMBER 2011

Record Sequence

The PCM2900C/2902C starts the audio capture into the internal memory after receiving the SET_INTERFACE

command, as shown in Figure 34.

Figure 34. Record Sequence

Suspend and Resume Sequence

The PCM2900C/2902C enters the suspend state after it sees a constant idle state on the USB bus

(approximately 5 ms), as shown in Figure 35. While the PCM2900C/2902C enters the suspend state, SSPND

flag (pin 28) is asserted. The PCM2900C/2902C wakes up immediately upon detecting a non-idle state on the

USB bus.

Figure 35. Suspend and Resume Sequence

Copyright

© 2011, Texas Instruments Incorporated

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Product Folder Link(s): PCM2900C PCM2902C