CM6535
USB Audio Chip
DESCRIPTION
FEATURES
The CM6535 is a USB 2.0 audio chip builds in 8051 for
flexible applications with Tri-Colors PWM LED driver,
two (2)-channel ADC/DAC and S/PDIF and I2S
interface makes it suitable for headset, notebook/
USB 2.0 full-speed compliant
USB Audio Class 1.0 compliant
USB Human Interface Device (HID) Class 1.1 compliant
Two (2)-channel DAC & I2S for audio output interface
Two (2)-channel ADC & I2S for audio input interface
Supports Digital Microphone Interface
mobile
docking,
speaker
and
microphone
applications. The internal 8051 can also be developed
to different applications, such as Microsoft™ Lync/
Skype/VoIP device and Android Phone or Tablet/Slate
docking device. The CM6535 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 internal
DAC/ADC and I2S support 8~96 KHz sampling rate and
16/24bits resolution.
Built-in S/PDIF Input/output transmitter
Built-in Equalizer on both playback and recording paths
Built-in AGC on recording path
Supports dual tone generator
The CM6535 integrates the equalizer on both playback
and recording paths to compensate the frequency
response of microphones and headphones.
Supports USB suspend/resume/reset functions
Supports control, interrupt, bulk, and isochronous data
transfers
The CM6535 also integrates 512K Byte flash (Including
32KB F/W programming size) and requires few passive
components to make a finish product. Thus, it can
save the total BOM cost and PCB area can be smaller.
Embedded 1T 8051 with 32K Byte SRAM and 512K Byte
flash(Including 32K Byte F/W programming size)
Supports OMTP and CTIA auto switch on a 4-pole jack
Integrated Tri-Colors PWM LED driver
Master/Slave H/W I2C/SPI/UART control interface for
external audio devices or FLASH access
Built-in 30mW @ 32 ohm load headphone amplifier
On chip watchdog timer
BLOCK DIAGRAM
SPDIF In
2 Channel I2S In
USB
Interface
-18~45dB
Microphone In
-30~33dB
-16~12dB
AGC
ADC
Line In
32K
SRAM
-30~33dB
External
12M Crystal
5-Band EQ
+12dB
-15~32dB
-30~12dB
MCU with 512K FLASH
-62~0dB
-44~0dB
4K ROM
DAC
Speaker/ Heaphone
5-Band EQ
2 Channel I2S Out
SPDIF Out
GPIO x 12
PWM LED X 3
Uart, I2C, SPI
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