CLM920_NC3_LTE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 14 of 37
48
1.5V
NC
49
RESERVED
PCM_DIN
DI
PCM receiving data
50
GND
GND
Ground
51
RESERVED
PCM_SYNC
DO
Frame
synchronization
signal
52
3.3Vaux
VBAT
PI
power input
The module typically has an IO port level of 1.8V (in addition to the SIM, the SIM card port level
supports 1.8V and 3.0V).
This module defines the RESERVED and NC pins to be left unconnected.
3.3 Power Interface
The CLM920_NC5 Mini PCIE module power connector consists of two parts:
VBAT is the working power of the module;
UIM_PWR is the working power supply for the SIM card;
The power interface of the CLM920_NC5 Mini PCIE module is as follows:
Table 3-3 Power pin definition
Pin number
name
I/O
description
Min
typical
Max
2,24,39,41,52
VBAT
PI
Module
power
supply
3.3V
3.7V
4.2V
8
UIM_PWR
PO
SIM
power
supply
0
1.8V/2.85V
1.9/2.95V
17
VDD_EXT
PO
Output power
1.8V
4,9,15,18,21,26,2
7,29,34,35,37,40,
43,50
GND
Ground
-
0
-
CLM920_NC5 Mini PCIE module adopts single power supply mode, the module provides 5 power
supply pins and 14 ground pins. In order to ensure the normal operation of the module, all power and
ground pins must be connected. The module power supply range is 3.3-4.2V, and it is recommended to
use 3.7V/2A power supply. The module will generate a peak current of more than 2A when transmitting
data or talking, resulting in a large ripple on the power supply. Therefore, when designing the circuit, the
power supply trace should be kept as short as possible. It is recommended to reserve one 220uF capacitor
near the power input. Customers are advised to use DCDC or LDO to provide sufficient current. The VBAT
is then powered through the MOS transistor so that the module can be completely powered down. For
practical use, please refer to the following circuit design: