
CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
- 36 -
Figure 3-15 RI pin signal waveform
DTR:
The DTR pin can be used as the sleep wake-up pin of the CLM920 NC3 module. When
the module enters sleep, the DTR pin can be pulled low to wake up the module.
Pull the DTR pin first
Send AT+DISABLEUSB=1, AT+CSCLK=1, after the module enters sleep
Pull down the DTR pin wake-up module.
3.7 USIM interface
The CLM920 NC3 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 3-11 SIM card signal definition
Pin
Signal
name
I/
O
Descript
ion
Param
eter
Level value (V)
Remarks
Min
Typical Max
13
USIM_
DET
DI
USIM
card
detectio
n
VIH
1.6
1.8
2
This pin signal
is internally
pulled high. If
the
USIM_DET
pin is not used,
leave it
VIL
0
0.18