power save in pic

hi all,
does any one worked on a pic ckt. powered by 6v battery which works for long duration( months ).i am using a pic16f628A attached to a rf receiver. i need to receive a data, based on this an led is lit up. the rf receiver is powered through the pic. i tried using WDT and SLEEP mode. But the power saving is not happening :cry: . i put the prescaler set to 2.3s .
Plz help. Thanks in advance.
jibu.

jibu said:

hi all,
does any one worked on a pic ckt. powered by 6v battery which works for long duration( months ).i am using a pic16f628A attached to a rf receiver. i need to receive a data, based on this an led is lit up. the rf receiver is powered through the pic. i tried using WDT and SLEEP mode. But the power saving is not happening :cry: . i put the prescaler set to 2.3s .
Plz help. Thanks in advance.
jibu.

Click to expand...

Are you sure the power is being used by the PIC and not the regulator? Normal regs will take much more current to run than the chip in SLEEP mode. If you can be really sure of the maximum battery voltage at any temp or charge state and the exact value of Vdd is not too critical, you can use a couple of diodes to drop it to 4.6v which of course consumes no quiescent current.

Some of the config options can result in a bit higher currents consumed during sleep mode, WDT and BOR in particular.

also if u down the clock speed to 32khz or somming then that will save some juice.