I am new to msp430. I am wondering if we are in lpm3 mode and timer_a
running, how much power consumption it will take for a typical msp430.
The data sheets seem to say a typical of 1 ua in lpm3 mode including
watchdog timer running, but does not seem to say if that figure will
hold if timer_a is also running.
Thanks
Asok

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Hi,

The electrical characteristics given in the datasheet are almost true.
I have checked it with a sample program(LPM3+TimerON) using MSP430F123,
below is the test result.

power consumption in LPM3 mode+Timer running

1.5uA @ 3.0V
0.9uA @ 2.5V

I can send you the necessary circuit diagram and sample program if
necessary.

BRG..

--- In m..., "asok_subra" wrote:
>
> I am new to msp430. I am wondering if we are in lpm3 mode and timer_a
> running, how much power consumption it will take for a typical msp430.
> The data sheets seem to say a typical of 1 ua in lpm3 mode including
> watchdog timer running, but does not seem to say if that figure will
> hold if timer_a is also running.
> Thanks
> Asok
>

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Hi,
Thanks for your response. Did they give the current for timer_a
operation anywhere in the data sheets? I thought I could not locate
it. In your tests what are the timers you used?
Thanks
Asok

--- In m..., "paddu.koti" wrote:
>
> Hi,
>
> The electrical characteristics given in the datasheet are almost true.
> I have checked it with a sample program(LPM3+TimerON) using MSP430F123,
> below is the test result.
>
> power consumption in LPM3 mode+Timer running
>
> 1.5uA @ 3.0V
> 0.9uA @ 2.5V
>
> I can send you the necessary circuit diagram and sample program if
> necessary.
>
> BRG..
>
> --- In m..., "asok_subra" wrote:
> >
> > I am new to msp430. I am wondering if we are in lpm3 mode and timer_a
> > running, how much power consumption it will take for a typical msp430.
> > The data sheets seem to say a typical of 1 ua in lpm3 mode including
> > watchdog timer running, but does not seem to say if that figure will
> > hold if timer_a is also running.
> > Thanks
> > Asok
>
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No,there is no detail abt timer current in the datasheet.
I have used timer_A with below settings,and I didn't check the power consumption at LPM3 without timer,
CCTL0 = CCIE;         
CCR0 = 20000;
TACTL = TASSEL_2 + MC_1;
※I have checked timer current in LPM0 mode, it was
   45uA@(1Mhz,3V)

Only way you can check the power consumption of MSP430 peripherals is through
experiments.
BRG...
----- Original Message ----
From: asok_subra
To: m...
Sent: Monday, June 2, 2008 1:03:22 PM
Subject: [msp430] Re: lpm3 power and timers
Hi,
Thanks for your response. Did they give the current for timer_a
operation anywhere in the data sheets? I thought I could not locate
it.. In your tests what are the timers you used?
Thanks
Asok

--- In msp430@yahoogroups. com, "paddu.koti" wrote:
>
> Hi,
>
> The electrical characteristics given in the datasheet are almost true.
> I have checked it with a sample program(LPM3+ TimerON) using MSP430F123,
> below is the test result.
>
> power consumption in LPM3 mode+Timer running
>
> 1.5uA @ 3.0V
> 0.9uA @ 2.5V
>
> I can send you the necessary circuit diagram and sample program if
> necessary.
>
> BRG..
>
> --- In msp430@yahoogroups. com, "asok_subra" wrote:
> >
> > I am new to msp430. I am wondering if we are in lpm3 mode and timer_a
> > running, how much power consumption it will take for a typical msp430.
> > The data sheets seem to say a typical of 1 ua in lpm3 mode including
> > watchdog timer running, but does not seem to say if that figure will
> > hold if timer_a is also running.
> > Thanks
> > Asok
>




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