Internal Connection of RAK4630

LPWAN Modules / EVBs
1

RAK4630 includes nRF52840 SoC and SX1262 LoRa transceiver. How does nRF52840 connect to SX1262 internally? Is it SPI?

Thanks

2

Yes, it is SPI.

The pin assignment can be found in the LoRaWAN library SX126x-Arduino

	_hwConfig.CHIP_TYPE = SX1262;		   // Chip type, SX1261 or SX1262
	_hwConfig.PIN_LORA_RESET = 38;		   // LORA RESET
	_hwConfig.PIN_LORA_NSS = 42;		   // LORA SPI CS
	_hwConfig.PIN_LORA_SCLK = 43;		   // LORA SPI CLK
	_hwConfig.PIN_LORA_MISO = 45;		   // LORA SPI MISO
	_hwConfig.PIN_LORA_DIO_1 = 47;		   // LORA DIO_1
	_hwConfig.PIN_LORA_BUSY = 46;		   // LORA SPI BUSY
	_hwConfig.PIN_LORA_MOSI = 44;		   // LORA SPI MOSI
	_hwConfig.RADIO_TXEN = -1;			   // LORA ANTENNA TX ENABLE
	_hwConfig.RADIO_RXEN = 37;			   // LORA ANTENNA RX ENABLE (power for antenna switch)
	_hwConfig.USE_DIO2_ANT_SWITCH = true;  // LORA DIO2 controls antenna
	_hwConfig.USE_DIO3_TCXO = true;		   // LORA DIO3 controls oscillator voltage
	_hwConfig.USE_DIO3_ANT_SWITCH = false; // LORA DIO3 controls antenna
	_hwConfig.USE_RXEN_ANT_PWR = true;	   // RXEN is used as power for antenna switch
	_hwConfig.USE_LDO = false;			   // LORA usage of LDO or DCDC power regulator (defaults to DCDC)
3

Thanks again, Bernd.