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Power Consumption in PIC16F690

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Mechatrommer:
Currently i'm working on mcu hobby project with pic16f690. Checking the amperage, its 2-4mA while doing nothing (infinite loop), when i send sleep command, the current is 1-2mA. I've setup the pic so it has 3 ADC input pin, another digital input pins that is normally pulled low with 10K resistor, the other unused pin is set as output (floating and not connected), timer0&1 are activated. Operating at 8MHz internal clock at 5V.

In the manual, its says, normal operation = 0.22mA, standby = 50nA @ 4 MHz, 2V. i guess the standby means sleep. So any idea on how to achieve this low current? and is my pic current consumption normal or on the high side? thanx.

alm:
Do you have something else like a voltage regulator or LED drawing current? Are you sure your current measurement is accurate down to the 1mA?

Mechatrommer:

--- Quote from: alm on July 01, 2010, 01:25:01 pm ---Do you have something else like a voltage regulator or LED drawing current? Are you sure your current measurement is accurate down to the 1mA?

--- End quote ---

no v.reg, no led. i'm using Uni-T DMM, can measure down to uA. In uA, it will read thousands.

alm:
Can't help with the expected power consumption for a PIC, don't have experience with those. I did notice that the power consumption figures are at 4MHz, 2V. The latter might be significant, any figures for 5V? Can you lower the voltage and see what happens with the current? Can you remove the PIC and see if the consumption drops to <<1mA? If the DMM has a resolution in the uA, it should have no problems measuring 1mA.

s3c:
This does seem a bit high, I've achieved extremely low power consumption by turning everything off before entering sleep mode, on the other hand I've had a PIC that ran at 200mA for no particular reason...

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