Datasheet

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
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Product Folder Link(s): PCM2900C PCM2902C