MG3732 module
17
This chapter introduces each logic function interfaces of MG3732 module & its operation descriptions, and
provides the designing sample.
Power and Reset Interface
COM Port
UIM Card Interface
Audio Interface
PCM interface
USB2.0 interface
Antenna Interface
Remarks:
In the system, the module layout should be far away from high-speed circuit, switch power, power
transformer, large power inductor, or single chip microcomputer’s clock circuit.
4.2
Power and Reset
4.2.1
Power Design
The module could work under two power modes: 1. Power adaptor; 2. Battery
The power could directly be supplied externally, the external power is added directly to V_MAIN and meets
the voltage requirements in table 4-1. The external power could be supplied by the power adaptor with constant
output, battery, USB power converter, etc. It’s recommended to design 2A current to meet the requirements of
GSM/GPRS.
Table 4-1 Voltage characteristics
Classification
MIN.
Typical
Max.
Input voltage
3.3 V
3.8 V
4.25 V
Power on
The module will be turned off after power-on normally. To turn on the module, provide a 2000-2500mS
low level pulse to ON/OFF PIN.
Power off
To turn off the module, provide a 2500-4000mS low level pulse to ON/OFF PIN.
Reset
To reset the module, provide a 2500-4000mS low level pulse to ON/OFF PIN
After reset, the module will be turned off. To turn on the module, provide a 2000-2500mS low level
pulse to ON/OFF PIN.
V_MSME_1V8
There is a voltage output pin with current adjuster on MG3732 module, which can be used to supply external
power to the board. The voltage of this pin and the voltage of baseband processor/memory come from the same
voltage adjuster. The voltage output is available only when the module is on. The normal output voltage is 1.8V,
and the user should absorb the current from this pin as little as possible (less than 10mA). Generally, it is
recommended to use this pin for pull-up when matching the level.
