Smart Machine Smart Decision
4.8.1.
SIM Card Application
Table 17: SIM pin definition
Pin name
Pin number
Function
VSIM
16
Voltage supply for SIM card. Support 1.8V or 3V SIM card
SIM_DATA
14
SIM data input/output
SIM_CLK
55
SIM clock
SIM_RST
15
SIM reset
SIM_PRE
54
SIM card detection
It is recommended to use an ESD protection component such as ST (
) ESDA6V1W5 or ON SEMI
) SMF05C. That the SIM peripheral circuit should be close to the SIM card socket. The
reference circuit of the 8-pin SIM card holder is illustrated in the following figure.
Figure 32: Reference circuit of the 8-pin SIM card holder
The SIM_PRESENCE pin is used for detection of the SIM card hot plug in. User can select the 8-pin SIM card
holder to implement SIM card detection function. AT command “AT+CSDT” is used to enable or disable SIM
card detection function. For details of this AT command, please refer to
document [1]
.
If the SIM card detection function is not used,
user can keep the SIM_PRESENCE pin open. The reference
circuit of 6-pin SIM card holder is illustrated in the following figure.
SIM800H_Hardware_Design_V1.01
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Содержание SIM800H
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