• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 79 subscribers
  • Views 935 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F425: ENTERING AND EXITING LPM3

SUMAN BHARTI
Intellectual 555 points
Part Number: MSP430F425

I am working on energy meter which need low power mode to save battery.

Can anybody please suggest/guide me how to get into LPM3 when power goes off and way to exit from it after power comes.

I have provided power sense on pin number 61 (port 2.3) in my hardware. 

Thanks in advance.

  • 0
    TI__Guru**** 217367 points
    Well if the device is not powered then you don't have to worry about entering a LPM since the device will not be on in the first place. It will then restart operation once it receives power again. The MSP430F425 does not have a backup battery or auxiliary power system and is not recommended for new designs (NRND). TI provides a wide range of devices supported by the MSP430-ENERGY-LIBRARY, including the fe427a, 4794, 6736, 47197, and afe253. I also recommend you look into the wide arrange of Application Reports and TI designs available for MSP430 metering solutions:

    www.ti.com/.../slaa538.pdf
    www.ti.com/.../slaa391.pdf
    www.ti.com/.../TIDM-MSP430AFE253SUBMETEREVM
    www.ti.com/.../TIDM-SINGLEPHASEMETER-AFE

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Intellectual 555 points

    Dear Ryan, 

    I already have PCB, with battery provided in it for battery backup.

    I have written code for RTC in it and want to use battery backup to run controller in LPM, so that RTC should be correct.

    I also want to provide display with switch in power off mode. On switch interrupt, only KWH display will be shown for 5 sec, then controller will again go to sleep mode.

    Controller will regain full active mode, when supply comes in. For this, i have provided power sensing on pin no. 61 (Port 2.3).

    I have seen this design of many companies, with same controller, MSP430F425/427. They are using same hardware with same features.

    Please help how it can be done.

**Attention** This is a public forum