LPM2100 mg NB Module Hardware User Guide
Shanghai Yuge Information Technology Co., Ltd.
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Table 3-8 SIM card hot swap detection pin definition
NO
Pin detection status
Functional description
1
High
SIM card insertion, SIM_DECT is high
2
Low
SIM card is pulled out, SIM_DECT is low
Figure 3-17 SIM card hot swap detection circuit*
①
It is recommended to add a diode protection next to the SIM_DECT pin of the
module.
②
When using a normally closed SIM card holder or a normally open SIM card holder,
the detection level can be set by the AT command. If AT+HOSCFG=1,1 is set, the state of the
SIM card is high when it is in position. When AT+HOSCFG=1,0 is set, the state of the SIM
card is low when it is in position. When AT+HOSCFG=0,0 is set. The SIM card hot plug
function is turned off.
③
"*" indicates that it is under development.
3.8 ADC interface
The LPM2100 mg series module provides a 10-bit analog-to-digital conversion input
interface for sample monitoring such as external temperature. The ADC pin voltage can be
read by the AT command.
In order to improve the accuracy of the ADC, the ADC trace should have a good
reference ground.