PCM2901

PCM2903

SLES034B − MARCH 2002 − REVISED JUNE 2004

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27

D+/D−

2.5 V (Typ.)

0 V

Internal Reset

Ready for Setup

SOF

Ready for Playback

SEL1 (Pin 9)

Bus Reset

Set Configuration

SOF

SOF

BPZ

Bus Idle

3.3 V

(Typ.)

5 V = VBUS

(Typ.)

1st Audio Data

2nd Audio Data

SSPND

VOUTL

VOUTR

700

µs

Device Setup

1 ms

VDD (Pin 27)

Figure 36. Power-On Under Attach

Play, Stop, and Detach Sequence

When the host finishes or aborts the playback, the PCM2901/2903 stops playing after the last audio data has

played.

Record Sequence

The PCM2901/2903 starts the audio capture into the internal memory after receiving the SET_INTERFACE

command.

Suspend and Resume Sequence

The PCM2901/2903 enters the suspend state after it sees a constant idle state on the USB bus, approximately

5 ms. While the PCM2901/2903 enters the suspend state, the SSPND flag (pin 28) is asserted. The

PCM2901/2903 wakes up immediately after detecting a non-idle state on the USB bus.