hmm... I'm nowhere near microamps, I'd love to be in the uA range. I'm powering the board at 12V, and using the pic's internal 5V shunt regulator. I've got a 510 ohm resistor between the power input and the pic. I have a diode on the 12V in, so it goes 12V in --> diode---> 510 ohm res ---> Pic. I also have two strings of LEDs picking up power after that diode, and the strings are switched to GND through a FET (BSH114). I'm PWMing the 2 fets. I also have a TVS to gnd (smaj24) on the 12V coming in. I figure that the LEDs aren't drawing any current when the FET is off, The TVS shouldn't be, the shunt regulator has got to draw some current, I'm thinking 4 or 5 mA. and then whats left is the pic, which is only driving the fets. I have a 10K pull down on the PWM line, and a 10K pullup to vcc on the switch input.
I'm measuring a current draw of about 12mA on the 12V line when the lights are off and the switch is open circuit. Chip running at 8Mhz with no napping = 12.6mA on my fluke DMM (300mA) setting. chip running at 4MHz with napping = 12.6mA.
Bookmarks