SX1302 PCI-e Board

6 / 12 www.rejeee.com 2020-04-29
2.2. Power Interface
Chart 4: Power Interface Definition
Pin No.
IO
Description
GND
4,9,15,18,21,26,27,29,34,35,37,40,43,50
3.3V
2,24,39,41,52
PI
3.3V Power
Input
M-GW1302S power on with DC 3.3V, Max TX currency can reach 400mA. In order
to prevent voltage drop, the switching power supply or LDO used shall be able to
provide sufficient current, and a tantalum capacitor or electrolytic capacitor with
large capacitance value shall be added at the module power supply port. If the
switching power supply is used to supply power to the module, the circuit wiring
shall avoid the antenna as far as possible to prevent EMC interference.
Pic 2: DC-DC Reference Design
2.3. SPI Interface
M-GW1302S SPI interface definition as below:
Chart 5: SPI interface definition
Name
Pin No.
I/O
Description
Voltage
SX_SCK
45
DI
SPI time input
3.3V
SX_MISO
47
DO
SPI data output
3.3V
SX_MOSI
49
DI
SPI data input
3.3V
SX_CSN
51
DI
SPI signal input
3.3V
If you want full-duplex communication, please refer to SX1302 datasheet.