Antenna Switch CTRL/ floating

[maxgerhardt]

The SX1261MBxAS board has a PE4259 RF switch.

The implementation for this board sets the pin to analog in (PIN_ANALOGIC) when the switch is supposed to be turned off.

LoRaMac-node/src/boards/NucleoL152/sx1261mbxbas-board.c

Lines 317 to 325 in 24d55f6

	void SX126xAntSwOn( void )
	{
	GpioInit( &AntPow, RADIO_ANT_SWITCH_POWER, PIN_OUTPUT, PIN_PUSH_PULL, PIN_PULL_UP, 1 );
	}
	void SX126xAntSwOff( void )
	{
	GpioInit( &AntPow, RADIO_ANT_SWITCH_POWER, PIN_ANALOGIC, PIN_PUSH_PULL, PIN_NO_PULL, 0 );
	}

Per datasheet the CTRL/ pin (that this piece of the software controls) is also the V_DD, positive supply voltage pin.

Does this pin not need to be driven to LOW instead of floating to prevent the switch from drawing any power?

[mluis1]

From our observations/testing letting this pin floating provides the expected result.
You are free to keep it as PIN_OUTPUT

If you don't mind I move this issue to the Discussions tab. In addition you may get better support by posting your question on Semtech developer portal forum