5 ms

D+/D–

SSPND

Idle

Active

Active

Suspend

D+/D–

1 ms

SET_INTERFACE

Audio Data

IN Token

Audio Data

IN Token

Audio Data

IN Token

SOF

SOF

SOF

SOF

SOF

V L

V R

IN

IN

PCM2903C

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SBFS038A – JUNE 2012 – REVISED SEPTEMBER 2015

9.5.3.3 Record Sequence

The PCM2903C starts the audio capture into the internal memory after receiving the SET_INTERFACE

command, as shown in Figure 39.

Figure 39. Record Sequence

9.5.3.4 Suspend and Resume Sequence

The PCM2903C enters the suspend state after it detects a constant idle state on the USB bus (approximately

5 ms), as shown in Figure 40. While the PCM2903C enters the suspend state, the SSPND flag (pin 28) is

asserted. The PCM2903C wakes up immediately after detecting a non-idle state on the USB bus.

Figure 40. Suspend and Resume Sequence

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