User's Manual

M10 Hardware Design

M10_HD_V3.0 - 53 -

Module

SIM_VDD

SIM_RST

SIM_CLK

SIM_DATA

SIM_PRESENCE

22R

VCC

RST

CLK IO

VPP

GND

VDD_EXT

10K

100nF SIM_CARD

GND

ESDA6V8V6

GNDPRESENCE

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 Figure

33 circuit is adopted.

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

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

Figure 34: Reference circuit of the 6 pins SIM card