Current consumption in low power mode

Sami,

the LPM3 current consumption only includes whatever is mentioned in the test conditions of the respective data sheet, which typically is the oscillator, a timer being clocked from that oscillator, brownout protection, and full RAM and peripheral configuration retention.

If you want to use peripherals during low-power mode you would need to add in that current as well. One thing to keep in mind is that you should consider to enable peripherals on-demand only using a timer-driven wakeup approach. For example, your average power consumption will be much lower in  a system where you fire up the comparator let's say once every second to perform a measurement, shut it off, and go back to low-power mode, rather than leaving it always-on. But of course what you can do will depending on your system.

Regards,
Andreas

thanks Andre,

Each pin in ports P1 and P2 have interrupt capability configured with PxIFG, PxiE and PxIES registers. So if i were activated an interrupt Pin in LPM3. This pin enabled interruption will need more power consumption or not. 

Regards

There is no current penalty for having interrupts enabled since this functionality doesn't draw any static current. For example, you could have all 16 PxIE bits set, and still get the advertised LPM3 number.

Regards,
Andreas

Andreas Dannenberg said:

If you want to use peripherals during low-power mode you would need to add in that current as well. One thing to keep in mind is that you should consider to enable peripherals on-demand only using a timer-driven wakeup approach. For example, your average power consumption will be much lower in  a system where you fire up the comparator let's say once every second to perform a measurement, shut it off, and go back to low-power mode, rather than leaving it always-on. But of course what you can do will depending on your system.

For the example you propose, it is necessary to know tEN_CMP.