PCM2704CDB datasheet(23/53 Pages) TI2

23 / 53 page

16 Bits

Frames

N Frames

(2) Continuous Write Operation

(1) Single Write Operation

MSB

LSB

MSB

LSB

PCM2704C, PCM2705C, PCM2706C, PCM2707C

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SBFS036B – MAY 2015 – REVISED AUGUST 2015

9.3.8 External ROM Example

External ROM data (sample set)

0xBB, 0x08, 0x04, 0x27,

0x50, 0x72, 0x6F, 0x64, 0x75, 0x63, 0x74, 0x20, 0x73, 0x74, 0x72, 0x69, 0x6E, 0x67, 0x73, 0x2E,

0x56, 0x65, 0x6E, 0x64, 0x6F, 0x72, 0x20, 0x73, 0x74, 0x72, 0x69, 0x6E, 0x67, 0x73, 0x20, 0x61,

0x72, 0x65, 0x20, 0x70, 0x6C, 0x61, 0x63, 0x65, 0x64, 0x20, 0x68, 0x65, 0x72, 0x65, 0x2E, 0x20,

0x80,

0x7D,

0x0A, 0x93, 0x01

Explanation

Data are stored beginning at address 0x00

Vendor ID: 0x08BB

Product ID: 0x2704

Product string: Product strings (16 bytes)

Vendor string: Vendor strings are placed here (32 bytes, 31 visible characters are followed by 1 space).

Power attribute (bmAttribute): 0x80 (bus-powered)

Max power (maxPower): 0x7D (250 mA)

Auxiliary HID usage ID: 0x0A, 0x93, 0x01 (AL A/V capture)

Note that the data bits must be sent from LSB to MSB on the I2C bus. Therefore, each data byte must be stored

with its bits in reverse order.

9.3.9 Serial Programming Interface (PCM2705C/7C)

The PCM2705C/7C supports a SPI to program the descriptor and to set the HID state. External ROM Descriptor

(PCM2704C/6C) describes descriptor data. Figure 5 shows the SPI timing; SPI Timing Characteristics lists the

respective timing characteristics.

Figure 29 shows the SPI write timing sequence.

Figure 29. SPI Write Operation

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Product Folder Links: PCM2704C PCM2705C PCM2706C PCM2707C

PCM2704CDB bảng dữ liệu(PDF) 23 Page - Texas Instruments