CLM920_AC3 Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
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Figure 3-16 RI pin signal waveform
Send AT+DISABLEUSB=1, AT+CSCLK=1, after the module enters sleep.
3.7 USIM interface
The CLM920 AC3 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 3-13 SIM card signal definition
Pin
Name
I/O
Descri
ption
Para
meter
Level value (V)
Remarks
Min
Typical
Max
13
USIM_
PRESE
NCE
DI
USIM
card
detecti
on
VIH
1.6
1.8
2
If you do not
use hot plug
power, 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
USIM_VDD=
1.8V
15
USIM_
DATA
IO
USIM
card
data
VIH
0.65*
VDD
3.05
USIM_VDD:
3.0V/1.8V
VIL
-0.3
0
0.25*
VDD
