Quectel M35 - Figure 33: Reference Circuit for Sim1 Interface with 8-Pin Sim Card Holder

GSM/GPRS Module Series
M35 User Manual
M35_User_Manual Confidential / Released 55 / 85
The following figure is the reference design for SIM1 interface.
VDD_EXT
Module
SIM1_VDD
SIM_GND
SIM1_RST
SIM1_CLK
SIM1_DATA
SIM1_PRESENCE
22R
22R
22R
10K
100nF SIM_Holder
GND
GND
TVS
33pF33pF 33pF33pF
VCC
RST
CLK
IO
VPP
GND
GND
Figure 33: Reference Circuit for SIM1 Interface with 8-pin SIM Card Holder
If SIM1 card detection function is not used, keep SIM1_PRESENCE pin open. The reference circuit for a
6-pin SIM card socket is illustrated as the following figure.
Module
SIM1_VDD
SIM_GND
SIM1_RST
SIM1_CLK
SIM1_DATA
SIM1_PRESENCE
22R
22R
22R
100nF
SIM_Holder
GND
TVS
33pF33pF 33pF
VCC
RST
CLK IO
VPP
GND
GND
33pF
Figure 34: Reference Circuit for SIM1 Interface with the 6-pin SIM Card Holder