Am I completely misunderstanding Vgs, rdsON etc?
The Vgs threshold is -2.0 to -4.0v
Do I need a different FET?
I'm trying to use a P-channel MOSFET (FQP7P06) as a high-side switch to turn off power to my sensors/radio from a 3.3v ATmega328P.
Why? The nrf24l01+ only consumes 900nA when you put it in standby.
something in my circuit is eating 2xAA in a week
So find out what it is with a multimeter....
Quote from: fungus on Feb 11, 2014, 10:39 amWhy? The nrf24l01+ only consumes 900nA when you put it in standby.i'm not convinced, that's datasheet speak for the chip alone, not measured by anyone in a circuit with pna/amp etc; as far as i know.something in my circuit is eating 2xAA in a week, its not the MCU, so i'm powering off the bmp085, dht11, ds18b20 and nrf24l01+ using the mosfet (or trying to!)
Five minutes with a multimeter and a switch will reveal the truth...
for some odd reason none of my meters work as ammeters properly.
You probably blew the fuses by not being careful. Take them apart and look.