Table 5: Pin Description - SimCom SIM7020C Hardware Design

PD Pull down

Table 5: Pin description

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