FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

STM32F413VH RTC using LSI

sushanth
Associate

‎2018-03-19 04:53 AM

Posted on March 19, 2018 at 12:53

Hi.

We are using STM32F413VH in one of our projects. We were planning to use the RTC peripheral with LSI as clock source to get timestamps and check weather the tasks are running periodically. We are planning to use RTC as it is independent of the system clock.

My question is how stable & accurate is the LSI? Can we use it to accurately measure time?

Thanks in advance.

0 Kudos
3 REPLIES 3
waclawek.jan
Guru

‎2018-03-19 02:07 PM

Posted on March 19, 2018 at 22:07

My question is how stable & accurate is the LSI?

It's very bad in this regard. It's primary purpose is to wake it up the mcu from very low power consumption modes in  applications where timing is not an issue.

0690X0000060AAeQAM.png

JW

0 Kudos
sushanth
Associate

‎2018-03-20 05:46 AM

Posted on March 20, 2018 at 13:46

We were planning to use the RTC for clocktest for safety purposes. Can we go ahead with LSE?

0 Kudos
henry.dick
Senior II

‎2018-03-20 06:30 AM

Posted on March 20, 2018 at 14:30

The data sheet has the answer for your question.

If your mcu is always running, consider using the main oscillator for time stamping.

0 Kudos
Top