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CLM920 TD3 LTE Module Hardware Usage Guide
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.
Signal
Pin
I/O
name
USIM_
13
DI
DET
USIM_
14
PO
VDD
USIM_
15
IO
DATA
USIM_
16
DO
CLK
USIM_
17
DO
RST
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Table 3-12 SIM card signal definition
Descripti
Para
on
meter
VIH
USIM
card
VIL
detection
USIM
V3.0
card
V1.8
power
supply
VIH
VIL
USIM
card data
VOH
VOL
VOH
USIM
card
clock
VOL
USIM
VOH
card
Level value (V)
Min
Typical
Max
1.6
1.8
2
0
0.18
2.75
3.0
3.05
1.75
1.8
1.95
0.65*
3.05
VDD
-0.3
0
0.25*
VDD
VDD
3.05
-0.45
0
0
0.45
VDD
3.05
-0.45
0
0
0.45
VDD
3.05
-0.45
Remarks
This pin signal is
internally pulled
high. If the
USIM_DET pin is
not used, leave it
floating.
USIM_VDD=3.0V
USIM_VDD=1.8V
USIM_VDD:3.0V/1
.8V
USIM_VDD:3.0V/1
.8V
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