hardware design v1.00

Smart Machine Smart Decision
SIM968_Hardware Design_V1.00 2013.02.25
14
Pin name Pin number I/O Description Comment
Power supply
VBAT 62, 63 I GSM power supply 3.2V ~ 4.8V
VRTC 42 I/O Power supply for GSM RTC
It is recommended to
connect with a battery or
a capacitor (e.g. 4.7uF).
VDD_EXT 44 O 2.8V output power supply If it is unused, keep open.
GPS_VCC 12 I GNSS Power supply 2.8V~4.3V
V_BACKUP 13 I Power supply for GNSS RTC
It is recommended to
connect with a battery or
LDO
GPS_VANT_OUT 75 O 2.8V output for GNSS active antenna If it is unused, keep open.
GPS_VANT_IN 76 I GNSS active antenna power supply If it is unused, keep open.
GND
1, 2, 5, 10, 14, 37,
40, 41, 43, 57, 58,
60, 61, 64, 65, 77,
78, 80
Ground
Charge interface
VCHG 74 I Charger input
TEMP_BAT 73 I Battery temperature sensor
Power on/down
PWRKEY 3 I
PWRKEY should be pulled low at
least 1 second and then released to
power on/down the module.
Pulled up internally.
Audio interfaces
MIC1P 23
MIC1N 24
I Differential audio input
SPK1P 22
SPK1N 21
O Differential audio output
MIC2P 27
MIC2N 28
I Differential audio input
SPK2N 25
SPK2P 26
O Differential audio output
If these pins are unused,
keep open.
Status
STATUS 52 O Power on status
NETLIGHT 51 O Network status
If these pins are unused,
keep open.
1PPS 11 O
Time Mark outputs timing pulse
related to receiver time
If unused, keep open.
LCD interface
DISP _CLK 6 O
DISP_DATA 7 I/O
Display interface If these pins are unused,
keep open.