Eddy Wireless SD Cards Series Spezifikationen PDF herunterladen (Seite 52)

M12 Hardware Design

M12_HD_V3.3 - 51 -

default configuration, SIM card detection function is disabled. Customer’s application can use

“AT+QSIMDET=1,0” to switch on and “AT+QSIMDET=0,0” to switch off the SIM card

detection function. For details of this AT command, please refer to document [1]. When

“AT+QSIMDET=1,0” is set and the tray with SIM card is removed from SIM socket, the

following URC will be presented.

+CPIN: NOT READY

When the tray with SIM card is inserted into SIM socket again and the module finishes

re-initialization SIM card, the following URC will be presented.

Call Ready

Module

SIM_VDD

SIM_RST

SIM_CLK

SIM_DATA

SIM_PRESENCE

22R

VDD_EXT

10K

100nF SIM_Holder

GND

ESDA6V8V6

33pF

33pF 33pF

33pF

VCC

RST

CLK IO

VPP

GND

Figure 33: Reference circuit of the 8 pins SIM card

Note: Please do not use “AT+QSIMDET=1,1” which causes to initialize SIM card when the

above circuit is adopted.

If customer does not need the SIM card detection function, keep the SIM_PRESENCE pin open.

The reference circuit using a 6-pin SIM card socket is illustrated as the following figure.

Quectel

Confidential

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Eddy Wireless SD Cards Series Spezifikationen Seite 52