User's Manual

Smart Machine Smart Decision
SIM7500A_User Manual_V1.00 2017-06-30
15
USIM_CLK 11 DO USIM clock
USIM_VDD 14 PO
Power output for USIM card, its
output Voltage depends on USIM
card type automatically. Its output
current is up to 50Ma.
USB
VBUS 9 DI,PD
Valid USB detection input with
3.6～5.85V detection voltage
USB_DM 7 I/O
Negative line of the differential,
bi-directional USB signal.
USB_DP
8 I/O
Positiveline of the differential,
bi-directional USB signal.
UART interface
RTS 36 DOH Request to send
If unused, keep
them open.
CTS 41 DI,PU Clear to Send
RXD 39 DI,PU Receive Data
RI 42 DOH Ring Indicator
DCD 37 DOH Carrier detects
TXD 38 DOH Transmit Data
DTR 40 DI,PU DTE get ready
I2C interface
SCL 4 DO I2C clock output
If unused, keep
them open.
SDA 5 I/O I2C data input/output
PCM interface
PCM_OUT 21 DO PCM data output.
If unused, please
keep them open.
PCM_IN 20 DI PCM data input.
PCM_SYNC 19 DO PCM data frame sync signal.
PCM_CLK 18 DO PCM data bit clock.
MCLK 17 DO Audio Master clock
GPIO
NETLIGHT 52 DO
LED control output as network
status indication.
If unused, please
keep them open.
STATUS 50 DO
Operating status output.
High level: Power on and firmware
ready
Low level: Power off
GPIO_1 26 IO GPIO
GPIO_49 49 IO GPIO
USIM_DET 12 IO
Default: GPIO
Optional: USIM card detecting
input.
H: USIM is removed
L: USIM is inserted
GPIO_37 48 IO GPIO