Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 17 / 82
3 Application Interface
The module adopts LCC package and has 44 pins. The following chapters provide detailed descriptions
about these pins.
 Pin of module
 Operating modes
 Power supply
 Power on/down
 Power saving
 RTC
 Serial interfaces
 Audio interfaces
 PCM interface
 SIM card interface
 SD card interface
 ADC
 Behaviors of the RI
 Network status indication
 RF transmitting signal indication