CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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3.3 Power interface
The CLM920 AC3 module power connector consists of three parts:
VBAT_BB, VBAT_RF is the module working power supply
USIM_VDD is the working power supply for SIM card
VDD_EXT is 1.8V output power (50mA)
3.3.1 Power supply design
CLM920 AC3 module power interface is as follows
：
Table 3-4 Power pin definitions
The CLM920 AC3 module is powered by a single power supply and the module provides
four power supply pins. Two of them are RF power supplies and two are baseband power
supplies. The power supply range is from 3.3V to 4.2V. It is recommended to use 3.7V/2A
power supply. If the module's operating voltage drop causes the VBAT supply voltage to be
too low or the supply current is insufficient, the module may shut down or restart. Therefore,
in order to reduce the power fluctuation of the module when working, it is necessary to use a
low-ESR value of the voltage regulator capacitor, the power pin and the ground pin should be
connected and can provide sufficient power supply capability.
Under the premise of ensuring that the VBAT power supply is sufficient, two 470uF/6.3V
tantalum capacitors can be connected in parallel with the power input, 1uF in parallel, 0.1uF
Pin
Name
I/O Description
Min
Typical
Max
57,58
VBAT_RF
PI
Module power
supply
3.3V
3.7V
4.2V
59,60
VBAT_BB
PI
Module power
supply
3.3V
3.7V
4.2V
14
USIM_VDD PO
SIM card power
supply
0
1.8V/2.85V
1.98/3.3V
7
VDD_EXT
PO
LDO output
1.8V
8~10,19,22
,36,46,48,5
0~54,56,72
, 85~112
GND
Ground
-
0
-
