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CLM920 TD3 LTE Module Hardware Usage Guide
69
USB_DP
70
USB_DM
3.3 Power interface
The CLM920 TD3 module power interface consists of three parts:
VBAT is the module working power supply
UIM_PWR is the working power supply for SIM card
VDD_EXT is 1.8V output power (50mA)
VDD_SDIO is the SD card pull-up power supply (50mA)
3.3.1 Power supply design
CLM920 TD3 module power interface is as follows：
Pin
Name
57,58,59,6
VBAT
0
14
UIM_PWR
7
VDD_EXT
34
VDD_SDIO
8,9,10,19,
22,36,46,4
8,50,51,52
GND
,53,54,56,
72,
85~112
The CLM920 TD3 module is powered by a single power supply and the module provides
four power supply pins. The VBAT power supply range is 3.3-4.2V, and it is recommended to
use 3.7V/2A power supply. When transmitting data or talking under HSPA/UTMS/GSM
network, the instantaneous high-power transmission will produce a peak current of more than
2A peak, which will cause a large ripple on the power supply. If the instantaneous voltage
drop causes the VBAT supply voltage to be too low. Or the supply current is insufficient and
the module may shut down or restart. In order to ensure the normal operation of the module,
Shanghai Yuge Information Technology co., LTD
USB_DP
USB_DM
Table 3-4 Power pin definitions
I/O
Description
Module power
PI
supply
PO
SIM power supply
PO
Output power
PO
Output power
Ground
USB
Min
Typical
3.3V
3.7V
0
1.8V/2.85V
1.8V
1.8V/2.85V
-
0
Max
4.2V
1.98/3.3V
-
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