User's Manual

Figure2 GT2GM-M module placement

The antenna pad in your PCB should be 3~5mm wide and there must not be any other traces and

ground under the pad. If needed, the matching network can be added between the antenna pad and

antenna port. The recommended circuit is shown as below:

Figure 3 GT2GM-M Antenna match

6.2 VBAT Pin (Pin 2~4)

The Power amplifier is supplied by the VBAT pin. During transmitting mode, high output

power will draw a large amount of current. The width of this power trace that is connected to the

VBAT pin could not be less than 60mil. In addition, it is better to shunt a 100uf@6.3V (low ESR)

bypass capacitor on VBAT pins to prevent voltage drop and to reduce ripple.(The maximum

current should be 1500mA in some time)

6.3 Charge in Pin (Pin 1)

In this module,we added the charge manage circuit for lithium battery , the max charge

Circuit should be 400mA. The charge voltage 5.5V+/-0.5V.

6.4 UART interface

The UART1 used as debug 、software download or as AT command control

Pin name DIR Pin Number

Function unit

TXD1 O 20 UART 1 data transmitting port

RXD1 I 19 UART 1 data receiving port

M5206

Module