PCM2704C datasheet(26/53 Pages) TI2

26 / 53 page

PCM2704C, PCM2705C, PCM2706C, PCM2707C

SBFS036B – MAY 2015 – REVISED AUGUST 2015

www.ti.com

9.5 Programming

9.5.1 USB Interface

Control data and audio data are transferred to the PCM2704C/5C/6C/7C through the D+ pin (pin 9 for the

PCM2704C/5C, pin 23 for the PCM2706C/7C) and D– pin (pin 8 for the PCM2704C/5C, pin 22 for the

PCM2706C/7C). D+ should be pulled up with a 1.5-k

Ω (±5%) resistor. To avoid back voltage in self-powered

operation, the device must not provide power to the pullup resistor on D+ while VBUS of the USB port is inactive.

All data to/from the PCM2704C/5C/6C/7C are transferred at full speed. Table 4 shows the information that is

provided in the device descriptor. Some parts of the device descriptor can be modified through external ROM

(PCM2704C/6C) or SPI (PCM2705C/7C).

Table 4. Device Descriptor

DEVICE DESCRIPTOR

DESCRIPTION

USB revision

1.1 compliant

Device class

0x00 (device defined interface level)

Device subclass

0x00 (not specified)

Device protocol

0x00 (not specified)

Max packet size for endpoint 0

8 bytes

Vendor ID

0x08BB (default value, can be modified)

0x27C4/0x27C5/0x27C6/0x27C7 (These values correspond to the model number, and the value can

Product ID

be modified.)

Device release number

1.0 (0x0100)

Number of configurations

Vendor strings

BurrBrown from Texas Instruments (default value, can be modified)

Product strings

USB AUDIO

DAC (default value, can be modified)

Serial number

Not supported

Table 5 shows the information contained in the configuration descriptor. Some parts of the configuration

descriptor can be modified through external ROM (PCM2704C/6C) or SPI (PCM2705C/7C).

Table 5. Configuration Descriptor

CONFIGURATION DESCRIPTOR

DESCRIPTION

Interface

Three interfaces

0x80 or 0xC0 (bus-powered or self-powered, depending on PSEL; no remote wake up. This value can

Power attribute

be modified.)

0x0A, 0x32, or 0xFA (20 mA for self-powered, 100 mA or 500 mA for bus-powered, depending on

Max power

PSEL and HOST. This value can be modified.)

Table 6 shows the information contained in the string descriptor. Some parts of the string descriptor can be

modified through external ROM (PCM2704C/6C) or SPI (PCM2705C/7C).

Table 6. String Descriptor

STRING DESCRIPTOR

DESCRIPTION

0x0409

BurrBrown from Texas Instruments (default value, can be modified)

USB AUDIO

DAC (default value, can be modified)

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Product Folder Links: PCM2704C PCM2705C PCM2706C PCM2707C

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