1.在没有mcu的情况下可以通过8个gpio脚组成24键的键盘
2.支持i2c与外界mcu进行联系
3.基本功能同cm108
4.48pin lqfp封装
5.支持第三方软件
6.主要应用于高效低成本的pc网络电话公司电话0755-83732995
l compliant with usb 2.0 full speed operation
l compliant with usb audio device class specification v1.0
l supports usb suspend/resume mode and remote wakeup with volume control pins
l single 12mhz crystal input with on-chip pll and embedded usb transceiver
l jumper pin for speaker mode (playback only) or headset mode (playback + recording)
l for headset mode, usb audio function topology has 2 input terminals, 2 output terminals, 1 mixer unit, 1 selector unit, and 3 feature units
l jumper pin for operation system mixer unit enable/disable under headset mode
l for speaker mode, usb audio function topology has 1 input terminal, 1 output terminal, and 1 feature unit
l support one control endpoint, one isochroous out endpoint, one isochroous in endpoint, and one interrupt in endpoint
l alternate zero bandwidth setting for releasing playback bandwidth on usb bus when this device is inactive
l volume up, volume down, and playback mute support usb hid for host control synchronization
l record mute pin with led indicator for record mute status
l external eeprom interface for vendor specific usb vid, pid, and serial number
l supports aes/ebu, iec60958, s/pdif consumer formats for stereo pcm data at s/pdif output
l 8 gpio pins with read/write via hid
l embedded buzzer function controlled by register
l support i2c interface for external mcu integrated
l jumper pin for output voltage swing (3.5v or 2.5v)
l jumper pin for power mode setting
l isochroous transfer uses adaptive mode with internal pll for synchronization
l 48k/44.1khz sampling rate for both playback and recording
l soft mute function
l embedded high performance 16 bit audio dac with earphone phone buffer
l host side data loss noise reduction function
l embedded 16 bit adc input with microphone boost
l embedded power on reset block
l embedded 5v to 3.3v regulator for single external 5v operation
l compatible with win98 se / win me / win 2000 / win xp and mac os9 / os x without additional driver
l 48 pin lqfp package
l support hardware sdk tool for third-party software or soft-phone development