SimCom SIM7020E - Contact

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SIM7020_Hardware_Design_V1.02 12 2018-07-25
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Table 5: Pin description
Pin name Pin No.
Default
status
Description Comment
Power supply
VB AT 34 、
3
PI
Power supply, voltage range:
2.1
-
3.6V.
VDD_EXT 40
PO
Power output 1.8V for other
external circuits with Max
50mA current output, such as
level shift circuit. Not present in
PSM mode.
If unused, keep it open.
VDD_3V3 9
PO
Power output 3.3V for other
external circuits with Max
50mA current output. Not
present in PSM mode.
Voltage range
3.3V-3.5V( depend on
VBAT). If unused,
keep it open.
GND
8 、
19 、
2
、27、 3
0
、
33 、
3
、37
Ground
System Control
PWRKEY 39
DI，PU
System power on/off control
input, active low. The efficient
input level must be below 0.5V.
PWRKEY has been
pulled up to VBAT via
40Kohm resistor
internally.
RESET 28 DI，PU
System reset control input,
active low.
RESET has been
pulled up to VBAT via
40Kohm resistor
internally.
SIM interface
SIM _ D ATA 15 I/O， PU SIM Card data I/O
All lines of SIM
interface should be
protected against ESD.
SIM_RST 17 DO SIM Reset
SIM_CLK 16 DO SIM clock
SIM_VDD 18 PO
Power output for SIM card, its
output Voltage depends on SIM
card type automatically. I
SIM_DET
14 DI
SIM card detecting input. (This
function do not support yet in
standard software.)
If used, keep a 10kΩ
resistor pulling up to
the VDD_EXT