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SIM7000 _Hardware Design _V1.04 2018-1-31
NRESET 16 DI, PU
System reset control input,
active low.
NRESET has been
pulled up to 1.8V via
40Kohm resistor
internally.
SIM interface
SIM _ D ATA 31 I/O,PU
SIM Card data I/O, which has
been pulled up via a 10KR
resistor to SIM_VDD
internally. Do not pull it up or
down externally.
All lines of SIM
interface should be
protected against ESD.
SIM_CLK 32 DO SIM clock
SIM_VDD 30 PO
Power output for SIM card, its
output Voltage depends on SIM
card type automatically. Its
output current is up to 50mA.
SIM_DET 34 DI SIM card detecting input.
If used, keep a 10kΩ
resistor pulling up to
the VDD_EXT
USB*
USB_VBUS 24 DI,PD
Valid USB detection input with
3.5~5.25V detection voltage
Software download
interface.
USB_DP 27 I/O
Positive line of the differential,
bi-directional USB signal.
USB_DM 28 I/O
Negative line of the differential,
bi-directional USB signal.
UART interface
DTR 3 DI,PU DTE get ready
If unused, keep them
open.
RI 4 DOH Ring Indicator
RTS 8 DI,PU Request to send
TXD 9 DOH Transmit Data
I2C interface
I2C_SDA 37 I/O I2C clock output
If unused, keep open,
or else pull them up
via 2.2KΩ resistors to
the VDD_EXT.
I2C_SCL 38 DO I2C data input/output
PCM interface
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