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Key Modules For Your Success
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展得國際有限公司
7
4. Board connections
Figure 2: Board connections and placement diagram.
PIN
Voltage
level
Description
PIN
Voltage
level
Description
P1
GND
Analog Ground
P16
SPI-DO
SPI data output, 3.3V I/O; reserved for
firmware download
P2
GND
Analog Ground
P17
NC
P3
GND
Analog Ground
P18
GNDDIG
Digital Ground
P4
NC
P19
1PPS
Time puls signal
P5
VCC
3.3V power supply
P20
LED
P6
GNDDIG
Digital Ground
P21
NC
P7
NC
P22
TxD
Serial Output
P8
BBat
Backup battery supply(1.95~3.6V)
P23
RxD
Serial Input
P9~12
NC
P24~25
NC
P13
SPI-CNS
SPI chip select, 3.3V I/O; reserved for
firmware download
P26
nreset
Low level force reset
P14
SPI-CLK
SPI clock, 3.3V I/O; reserved for
firmware download
P27
NC
P15
SPI-DI
SPI data input, 3.3V I/O; reserved for
firmware download
P28
GND
Analog Ground
P16
SPI-DO
SPI data output, 3.3V I/O; reserved
for firmware download
P29
RF in
RF in
P17
NC
P30
GND
Analog Ground
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