Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 43 / 82
Figure 21: Sketch Map for RS-232 Interface Match
Please visit vendor web site to select suitable IC, such as: http://www.maximintegrated.com and
http://www.exar.com/
.
3.8. Audio Interfaces
The module provides one analog input channels and two analog output channels.
Table 9: Pin Definition of Audio Interface
Interface Pin Name Pin No. Description
AIN/AOUT1
MICP 3 Microphone positive input
MICN 4 Microphone negative input
SPK1P 5 Channel 1 Audio positive output
SPK1N 6 Channel 1 Audio negative output