CM6502B Evaluation Board

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For new designs, the Cmedia CM6533 is highly reomended. The CM6533 integrates FLASH and Xtal which reduces BOM cost.
Cmedia’s CM6500 / CM6502 is a highly-integrated USB audio single chip optimized for consumer headset solutions. This document is a user guide for CM6500 / CM6502 evaluation boards (EVB), which describes the board’s functions, I/O jacks, LEDs, controls and some user notes.

CM6500 / CM6502 supports standard HID compliant volume control pins and playback control pins. CM6500 / CM6502 also offers playback operation and playback/record mute LED indicators in order that users know the current status.

All necessary analog and digital modules are embedded in CM6500 / CM6502, including stereo DAC, headphone driver, stereo ADC, microphone pre-amp booster, PLL, regulator, and USB transceiver. Moreover, CM6502 integrates 5-band hardware equalizer (EQ) with 4 default preset modes (Default/flat, Communication, Gaming, and Movie). The EQ preset gain parameters can also be customized for compensating the headphone SPL performance or to be complaint with TIA-920 standard.

In addition, embedded Mic Auto-Gain-Control (AGC) function can adjust input gain automatically to avoid large signal clipping or too small input signal level for a stable voice communication recording quality. Optional clipping detection LED also gives users an alert when the near-to-excess large input signal happens. With versatile CM6500 / CM6502-based headsets, users will get better sound experience on PC.

The CM6500 / CM6502 USB Audio controller evaluation board has several hardware features. With each feature’s description in Figure 1, the feature’s location can be clearly identified.

Cmedia CM6500_CM6502_001.jpg

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USB 2.0 full-speed compliant
USB Audio Class 1.0 compliant
USB Human Interface Device (HID) Class 1.1 compliant
2 channel DAC for audio output interface
2 channel ADC for audio input interface
Build in 48K/44.1KHz and 16bit S/PDIF transmitter
Build in AGC on recording path
Support USB suspend/resume/reset functions
Support control, interrupt, bulk, and isochronous data transfers
Embedded 1T 8051
Master I2C control interface for external audio devices or EEPROM access
14 GPIO pins


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Cmedia CM6502B-EVB Datasheet
Cmedia CM6502B-EVB User Manual

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CM6502B Evaluation Board
Part #: CM6502B-EVB
CM6502B Evaluation Board