The CM6531N is a low power USB 2.0 audio controller builds in 8051 for Lightning  interface applications. Accompany with ultra-low power codec makes it suitable for low power headset, notebook/mobile docking and microphone applications. The internal 8051 can also be developed to different applications, such as Android Phone or iDevice Accessories with special functions, such as HID buttons or LED control. The CM6531N is compatible with USB Audio Class 1.0 and USB 2.0 full-speed, Thus it can plug and play without additional software installation on the major operation systems. The I2S support 8~96 KHz sampling rate and 16/24bits resolution. 

The CM6531N also integrates 512K Byte flash (Including 32KB F/W programming size) but requires few passive components to make a finish product. Thus it can save the total BOM cost and PCB area can be smaller.


  • Support Apple iAP1/iAP2 Protocol
  • Support Apple lightning interface
  • Standby(<10mA) and operation power consumption meet Apple's spec
  • USB 2.0 full-speed compliant
  • USB Audio Class 1.0 compliant
  • USB Human Interface Device (HID) Class 1.1 compliant
  • Two (2) channel I2S for audio output interface 
  • Two (2) channel I2S for audio input interface
  • Supports Digital Microphone Interface
  • Built-in S/PDIF Input/output Interface
  • Supports USB suspend/resume/reset functions
  • Supports control, interrupt, bulk, and isochronous data transfers
  • Embedded 1T 8051 with 32K Byte SRAM and 512K Byte/Flash (Including 32K Byte F/W programming size)
  • Integrated Tricolors PWM LED driver
  • Master/Slave hardware I2C/SPI/UART control interface for external audio devices or FLASH access
  • On chip watchdog timer
  • Industrial standard QFN-48 package (7x7mm)
USB Audio,PCIe audio,USB audio ic,USB sound chip