hardware design v1.00

Smart Machine Smart Decision
SIM968_Hardware Design_V1.00 2013.02.25
15
DISP _D/C 8 O
DISP _CS 9 O
I
2
C interface
I2C_SDA 56 O
I
2
C serial bus data
I2C_SCL 55 I/O
I
2
C serial bus clock
If these pins are unused,
keep open.
Keypad interface / GPIOs
GPIO1/KBR0 31 GPIO1/keypad row 0
GPIO2/KBR1 32 GPIO2/keypad row 1
GPIO3/KBR2 33 GPIO3/keypad row 2
GPIO4/KBC0/
SIM_PRESENCE
34
GPIO4/keypad column 0/ SIM card
detection
GPIO5/KBC1 35 GPIO5/keypad column 1
GPIO6/KBC2 36
I/O
GPIO6/keypad column 3
If these pins are unused,
keep open.
GSM Serial port/ Debug interface
RXD 68 I Receive data
TXD 71 O Transmit data
RTS 66 O Request to send
CTS 67 I Clear to send
DCD 70 O Data carrier detect
RI 69 O Ring indicator
DTR 72 I Data terminal ready
If only TXD and RXD
are used, it is suggested
to pull down DTR, and
others pins can be kept
open.
DBG_TXD 38 O
DBG_RXD 39 I
For debugging and upgrading
firmware
If these pins are unused,
keep open.
GNSS Serial port
GPS_TXD 15 O
GPS_RXD 16 I
For GNSS NMEA information output
If these pins are unused,
keep open.
GPS_TXD1 29 O
GPS_RXD1 30 I
Serial communication for RTCM
If these pins are unused,
keep open.
SIM interface
SIM_VDD 20 O
Voltage supply for SIM card. Support
1.8V or 3V SIM card
SIM_DATA 17 I/O SIM data input/output
SIM_CLK 19 O SIM clock
SIM_RST 18 O SIM reset
All signals of SIM
interface should be
protected against ESD
with a TVS diode array.
ADC
ADC 47 I Input voltage range: 0V ~ 2.8V If it is unused, keep open.
Pulse width modulation( PWM )
PWM1 48 O PWM
PWM2 49 O PWM
PWM3 50 O PWM
If these pins are unused,
keep open.
GSM/GNSS RF interface
GSM_ANT 59 I/O GSM radio antenna connection Impendence must be