Decription Of Hardware Interfaces; Summary; Power And Reset; Power Design - Zte MG2636 User Manual

4

Decription of Hardware Interfaces

4.1 Summary

This chapter introduces each logic function interfaces of MG2636 module & its operation descriptions, and
provides the designing sample.
 Power and Reset Interface
 COM Port
 SIM 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.
Classification
Input voltage
 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

Table 4-1 Voltage characteristics

MIN.
3.3 V
Typical
3.8 V
15
MG2636 module
Max.
4.25 V