User's Manual

Smart Machine Smart Decision
SIM7500A_User Manual_V1.022016-09-29
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 Shielding the SIM card signal by ground well
 Recommended to place a 100nF capacitor on SIM_VDD line and keep close to the SIM
card holder
 Add some TVS which parasitic capacitance should not exceed 50pF
 Add 51Ω resistor to (SIM_RST/SIM_CLK/SIM_DATA) signal could enhance ESD
protection
 Add 22pF capacitor to (SIM_RST/SIM_CLK/SIM_DATA) signal to induce RF signal
interference
3.5.3 Recommended USIM Card Holder
It is recommended to use the 6-pin USIM socket such as C707 10M006 512 produced by
Amphenol. User can visit http://www.amphenol.com for more information about the holder.
Figure 19: Amphenol SIM card socket
Table 13: Amphenol USIM Socket Pin Description
Pin
Signal
Description
C1
USIM_VDD
USIM Card Power supply.
C2
USIM_RST
USIM Card Reset.
C3
USIM_CLK
USIM Card Clock.
C5
GND
Connect to GND.
C6
VPP
C7
USIM_DATA
USIM Card data I/O.