CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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Figure 3-4 DC switching power supply reference circuit
Figure 3-5 PMOS tube control power switch reference circuit
To prevent damage to the module from surges and overvoltages, it is recommended to
connect a 5.1V/500mW Zener diode to the VBAT pin of the module.
It is recommended to add 3 ceramic capacitors (33pF, 10pF, 100nF) to the power pin
input and place them near the VBAT pin.
The minimum operating voltage of the module is 3.3V. Since the data is transmitted or
the call will generate more than 2A, the ripple voltage drop will occur on the power
supply voltage. Therefore, the actual supply voltage must not be lower than 3.3V.
Due to the large current consumption of the module power pins, it is recommended that
the PCB traces be as short as possible. Minimize the equivalent impedance of the VBAT
trace.
