CM6571 Datasheet, PDF (7/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

 S/PDIF transmitter
 Aux in
CM6571
USB Audio Sound Chip
3.5 Integrated 8051 microprocessor
 Embedded 8051 microprocessor to handle comment/protocol transactions
 Connects to an external EEPROM memory for firmware codes
 HID interrupts can be implemented via firmware codes
 Provides maximum HW configuration flexibility with firmware code upgrade
 VID/PID/product strings can be customized via firmware code programming
3.6 Control interface
 Master I2C control interface for external audio devices or EEPROM access
 Maximum of 15 GPIO pins can be configured via firmware programming
 GPIOs set to HID key, LED indicator and IR receiver configurations
3.7 General
 HW EQ for both playback and record paths
 Single 12MHz crystal input is required only (embedded PLL function)
 Single 5V power supply (embedded 5V to 1.8V regulator for digital core, 5V to 3.3V regulator for digital IO, 5V to
3.5V regulator for analog codec)
 3.3V digital I/O pads with 5V tolerance
 Industry-standard VQFN-88 package (10x10mm)
Note:
CM6571 is a USB 2.0 full speed audio device. Since bandwidth limitation, CM6571 can’t support 96KHz/24btis for
playback and capture streams simultaneously. The possible combinations are as below table.
Audio Format
Playback
96KHz/24bits
48K/24bits or below
Capture
48kHz/24bits or below
96KHz/24bits
And for best compatibility in different OS, the default input and output audio format support up to 48KHz and 16bits.
96KHz/24bits can be enabled by firmware update.
Revised: Nov. 2012
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