SimCom SIM7000 Hardware Design page 18

NRESET 16
SIM interface
SIM_DATA 31
SIM_RST 33
SIM_CLK 32
SIM_VDD 30
SIM_DET 34
USB*
USB_VBUS 24
USB_DP 27
USB_DM 28
UART interface
DTR 3
RI 4
DCD 5
CTS 7
RTS 8
TXD 9
RXD 10
I2C interface
I2C_SDA 37
I2C_SCL 38
PCM interface
PCM_CLK 11
SIM7000 _Hardware Design _V1.04
System reset control input,
DI, PU
active low.
SIM Card data I/O, which has
been pulled up via a 10KR
I/O,PU resistor to SIM_VDD
internally. Do not pull it up or
down externally.
DO SIM Reset
DO SIM clock
Power output for SIM card, its
output Voltage depends on SIM
PO
card type automatically. Its
output current is up to 50mA.
DI SIM card detecting input.
Valid USB detection input with
DI,PD
3.5~5.25V detection voltage
Positive line of the differential,
I/O
bi-directional USB signal.
Negative line of the differential,
I/O
bi-directional USB signal.
DI,PU DTE get ready
DOH Ring Indicator
DOH Carrier detects
DOH Clear to Send
DI,PU Request to send
DOH Transmit Data
DI,PU Receive Data
I/O I2C clock output
DO I2C data input/output
DO PCM data bit clock.
Smart Machine Smart Decision
NRESET has been
pulled up to 1.8V 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
Software download
interface.
If unused, keep them
open.
If unused, keep open,
or else pull them up
via 2.2KΩ resistors to
the VDD_EXT.
If unused, please keep
2018-1-31