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Discussion Groups | MSP430 | Current supply in LPM3
The purpose of this group is to foster exchange of information on the Texas Instruments MSP430 family of microcontrollers and related tools. Everyone welcome, all levels of familiarity/expertise.
Current supply in LPM3 - rene - Oct 23 10:36:57 2009
CPU: MSP430F149
My device must run with a 3.68 MHz xtal on XT1
because I want 57600 baud rate.
Have you a solution with standard xtal at 32.768 kHz for this baud rate
How I can evaluate the standby current on LPM3 mode with a 3.68 MHz xtal.
Thank
------------------------------------
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My device must run with a 3.68 MHz xtal on XT1
because I want 57600 baud rate.
Have you a solution with standard xtal at 32.768 kHz for this baud rate
How I can evaluate the standby current on LPM3 mode with a 3.68 MHz xtal.
Thank
------------------------------------
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Re: Current supply in LPM3 - old_cow_yellow - Oct 23 11:44:32 2009
You can simply turn on the 3.68 MHz xtal on XT1, go to LPM3, and measure the current
consumption.
To reduce the current, you could use a watch xtal instead. The firmware should adjust the DCO once in a while so that its frequency is 225 times that of the watch xtal. 225*32769=7372800 which is 2*3.6864 MHz
--- In m...@yahoogroups.com, "rene" wrote:
>
> CPU: MSP430F149
>
> My device must run with a 3.68 MHz xtal on XT1
> because I want 57600 baud rate.
>
> Have you a solution with standard xtal at 32.768 kHz for this baud rate
>
> How I can evaluate the standby current on LPM3 mode with a 3.68 MHz xtal.
>
> Thank
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
To reduce the current, you could use a watch xtal instead. The firmware should adjust the DCO once in a while so that its frequency is 225 times that of the watch xtal. 225*32769=7372800 which is 2*3.6864 MHz
--- In m...@yahoogroups.com, "rene"
>
> CPU: MSP430F149
>
> My device must run with a 3.68 MHz xtal on XT1
> because I want 57600 baud rate.
>
> Have you a solution with standard xtal at 32.768 kHz for this baud rate
>
> How I can evaluate the standby current on LPM3 mode with a 3.68 MHz xtal.
>
> Thank
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )