PCM2900

PCM2902

SLES035B − MARCH 2002 − REVISED JUNE 2004

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USB INTERFACE

Control data and audio data are transferred to the PCM2900/2902 via D+ (pin 1) and D– (pin 2). All data to/from

the PCM2900/2902 is transferred at full speed. The device descriptor contains the information described in

Table 1. The device descriptor can be modified on request; contact a Texas Instruments representative for

details.

Table 1. Device Descriptor

USB revision

1.1 compliant

Device class

0x00 (device defined interface level)

Device sub class

0x00 (not specified)

Device protocol

0x00 (not specified)

Max packet size for end-point 0

8 byte

Vendor ID

0x08BB (default value, can be modified)

Product ID

0x2900 / 0x2902 (default value, can be modified)

Device release number

1.0 (0x0100)

Number of configurations

1

Vendor strings

String #1 (see Table 3)

Product strings

String #2 (see Table 3)

Serial number

Not supported

The configuration descriptor contains the information described in Table 2. The configuration descriptor can be

modified on request; contact a Texas Instruments representative for details.

Table 2. Configuration Descriptor

Interface

Four interfaces

Power attribute

0x80 (Bus powered, no remote wakeup)

Max power

0x32 (100 mA. Default value, can be modified)

The string descriptor contains the information described in Table 3. The string descriptor can be modified on

request; contact a Texas Instruments representative for details.

Table 3. String Descriptor

#0

0x0409

#1

Burr-Brown from TI (default value, can be modified)

#2

USB audio codec (default value, can be modified)

DEVICE CONFIGURATION

Figure 31 illustrates the USB audio function topology. The PCM2900/2902 has four interfaces. Each interface

is constructed by alternative settings.