• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 78 subscribers
  • Views 679 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

How can use RTC-A of MSP430F5325 Controller when power will fail

chandrashekhar pardikar
Prodigy 20 points
Other Parts Discussed in Thread: MSP430F5325, MSP430F5333, MSP430F5335, MSP430F5336, MSP430F5338

Hi all,

I want to use inbuilt RTC of the MSP430F5325 micro controller, In this micro controller RTC-A is present i can use it during supply available but when supply will fail micro controller power will lost.

I want RTC to continuously log data after power will fail . Then how i can connect the external battery to the controller for getting the power supply after power will fail there is any provision in this IC.

 Please reply as sson as possible i stuck up


Thanks

chandresh

  • 0
    Guru 14640 points

    Here is a quote from http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/19196/74558#pi316701=2 -

    "the RTC is not supported by the backup battery on the F5524 device. [same device family as F5325]

    The best way to figure out which devices support this feature is by checking the product brochure.

    Download this from the overview page:

    http://www.ti.com/lsds/ti/microcontrollers_16-bit_32-bit/msp/overview.page

    And perform a search for 'battery backup'.

    This is mainly available in the F663x/563x families."

    -----------------------------------------

    A round-about way of checking for battery-backed RTC on MSP430, but there are some devices that have it. Whether those devices also have other features that you need is something you will have to determine. If you are not able to find such a 430 device, you may need to invest in an external RTC chip that has battery-backup...

  • 0 in reply to Todd Anderson78572
    Guru 14640 points

    I just did a quick search of the document and found MSP430F5333, MSP430F5335, MSP430F5336, and MSP430F5338 as possible alternatives...

     

  • 0 in reply to Todd Anderson78572
    Prodigy 20 points

    Dear Sir,

    Thanks for the answer,

    If we can not drive RTC in this controller in battery backup mode then why Ti has given RTC in this controller without battery battery back up RTC of this controller don't have any use.

    Do you have the chipest circuit of the external rtc interfacing to this controller .

  • 0 in reply to chandrashekhar pardikar
    Guru 14640 points

    I know that the MSP430F5333 has a larger footprint than the F5325, but it does have battery backup. Can that part be substituted into your design?

    If not, I would look at a site like Digi-key or Mouser for an appropriate part. I did a google search on "standalone realtime clock" and it did point me to a spot on Digi-key with an interesting looking stand-alone part.

    Hopefully, that helps. I happen to be working with an MSP that does not have battery backup, and the RTC has done well - as well as an external stand-alone RTC. (I did have some issues with losing the crystal and reverting to the internal oscillator, but once understood, I have been able to make the MSP430 RTC work fine...) I also understand that you may be in an environment where battery-backed RTC is a requirement.

**Attention** This is a public forum