SM470R1B1M-HT Real Time Clock firmware options

Cam Buskell

Other Parts Discussed in Thread: SM28VLT32-HT, SM470R1B1M-HT

Hello.

I am assisting in building a tool that will serve as a memory storage unit for applications up to 200C

This tool is based around the SM470R1B1M-HT micro and SM28VLT32-HT Flash.

I also require an RTC. The problem is that no RTCs exist in my temperature ranges. Now I've found a few options for high temp XOs at 32kHz, but I would still have to implement the firmware for the RTC separately.

What I am looking for is some advice on how to proceed. Would it be best to make use of a RTI pin on the micro to count pulses from the XO and create the counting clock from there? What other options can you suggest for this implementation? Any examples?

Thanks for your time.

over 13 years ago

Jean-Marc Mifsud over 13 years ago

TI__Mastermind 22375 points

Cam,

Sorry for this late answer.

Is your question still open on your side or did you find a solution for your problem?

The only solution that I can see is to use the RTI to generate a tick that will be use to emulate RTC by software.

Cam Buskell over 13 years ago in reply to Jean-Marc Mifsud

Intellectual 425 points

Yes. This design is in concept level, so it is very much open for any options you have to suggest.

Thanks for following up with this issue.

Kejun Wang over 12 years ago in reply to Jean-Marc Mifsud

Prodigy 170 points

Hi Jean

1) one of the clock sources of the RTI comes from oscillator directly, if I feed an external clock signal to the pin OSCIN, does the clock source of the RTI come from this external oscillator directly?

2) where is the another clock source of the RTI? what is the frequency?

3) Can I disable PLL by software to save the power?

Thank you

Clark

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SM470R1B1M-HT Real Time Clock firmware options