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Play, Stop, and Detach Sequence

Record Sequence

Suspend and Resume Sequence

D+/D–

V

L

OUT

V

R

OUT

AudioData

AudioData

Last AudioData

Detach

SOF

SOF

SOF

SOF

SOF

1ms

V

(Pin3)

BUS

T0056-02

D+/D–

V L

IN

V R

IN

1ms

SET_INTERFACE

AudioData

IN Token

AudioData

IN Token

AudioData

IN Token

SOF

SOF

SOF

SOF

SOF

T0259-01

PCM2900

PCM2902

SLES035E – MARCH 2007 – REVISED MARCH 2008

When the host finishes or aborts the playback, the PCM2900/2902 stops playing after the last audio data has

played.

The PCM2900/2902 starts the audio capture into the internal memory after receiving the SET_INTERFACE

command.

The PCM2900/2902 enters the suspend state after it sees a constant idle state on the USB bus, approximately

5 ms. While the PCM2900/2902 enters the suspend state, SSPND flag (pin 28) is asserted. The PCM2900/2902

wakes up immediately when detecting the non-idle state on the USB bus.

Figure 33. Play, Stop, and Detach

Figure 34. Record Sequence

Copyright © 2007–2008, Texas Instruments Incorporated

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Product Folder Link(s): PCM2900 PCM2902