Datasheet

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
www.ti.com SBFS038 –JUNE 2012
Record Sequence
The PCM2903C starts the audio capture into the internal memory after receiving the SET_INTERFACE
command, as shown in Figure 38.
Figure 38. Record Sequence
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 39. 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 39. Suspend and Resume Sequence
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Product Folder Link(s): PCM2903C