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CLM920 TD3 LTE Module Hardware Usage Guide
3.7.2 UIM_DET Hot Swap Reference Design
The CLM920 TD3 module supports the USIM card hot plug function. The UIM_DET
pin acts as an input detection pin to determine whether the USIM card is inserted or not. The
UIM_DET pin defaults to a pull-up high. The hot plug function can be turned on or off by
AT+HOSCFG. This function is off by default (see the 9X07 AT command set for details).
NO.
AT command
1
AT+HOSCFG=1,1
2
AT+HOSCFG=1,0
It is recommended to add a diode protection next to the UIM_DET pin of the module.
When using a normally closed SIM card holder or a normally open SIM card holder, the
detection function can be set by the AT command. If AT+HOSCFG=1 is set, the status of
the SIM card is high when the SIM card is in position, and AT+HOSCFG=1 is set. When
the SIM card is in the state, the status is low. Set AT+HOSCFG=0, 0 SIM card hot swap
function is off.
3.8 General purpose GPIO interface
The CLM920 TD3 module contains five general control signals. The interface is defined
as follows：
Pin Signal name
Shanghai Yuge Information Technology co., LTD
Table 3-13 SIM card hot swap detection pin definition
UIM_DET status
high
low
Figure 3-17 Hot swap detection of the USIM card
Table 3-14 General GPIO Pin Definitions
I/O Description
Functional description
SIM card insertion, UIM_DET is high
SIM card insertion, UIM_DET is low
Level value (V)
param
eter
Min
Typical Max
Remarks
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