CLM920 TD3 LTE Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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Send AT+DISABLEUSB=1, AT+CSCLK=1, and the module will go to sleep.
Pull down the DTR pin wake-up module.
3.7 USIM interface
The CLM920 TD3 module provides a USIM card interface compatible with the ISO
7816-3 standard. The USIM card power supply is provided by the module's internal power
manager and supports 1.8V/3.0V voltage.
Table 3-12 SIM card signal definition
Pin
Signal
name
I/O
Descripti
on
Para
meter
Level value (V)
Remarks
Min
Typical
Max
13
USIM_
DET
DI
USIM
card
detection
VIH
1.6
1.8
2
This pin signal is
internally pulled
high. If the
USIM_DET pin is
not used, leave it
floating.
VIL
0
0.18
14
USIM_
VDD
PO
USIM
card
power
supply
V3.0
2.75
3.0
3.05
USIM_VDD=3.0V
V1.8
1.75
1.8
1.95
15
USIM_
DATA
IO
USIM
card data
VIH
0.65*
VDD
3.05
USIM_VDD=1.8V
VIL
-0.3
0
0.25*
VDD
VOH VDD
-0.45
3.05
VOL
0
0
0.45
16
USIM_
CLK
DO
USIM
card
clock
VOH VDD
-0.45
3.05
USIM_VDD:3.0V/1
.8V
VOL
0
0
0.45
17
USIM_
RST
DO
USIM
card
VOH VDD
-0.45
3.05
USIM_VDD:3.0V/1
.8V