2020-03-03 09:36 AM
Hi,
I am trying to get some clarification on the accuracy of the STM32L4's HSI16. AN4736 mentions that the HSI16 will leave ST's factory calibrated to [-0.75%, 0.5%] at 30 C. DS11453 section 6.3.8 shows that the drift over 0 to 85 C will be -1% to 1%. Is this in addition to the [-0.75%, 0.5%] so that the total drift over temperature could be up to -1.75%? Or is [-1%, 1%] the total drift?
Also, the HSI16 stabilization time is given as 5 us max. Can the frequency be considered as 100% of its final value after this time?
Solved! Go to Solution.
2020-03-10 09:30 AM
Hello @PRuss
The total HSI16 oscillator frequency drift over temperature (0 to 85°C) is -1% to 1% as mentioned in STM32L431 datasheet DS11453.
The HSI16 oscillator stabilization time is 5 µs max, so the frequency can reach 100% of its value after this time.
Best regards
Bouraoui
2020-03-03 09:51 AM
I'd formulate it so that the total deviation of HSI16 from nominal frequency in the given temperature range is up to -1.75%, without additional calibration.
> Also, the HSI16 stabilization time is given as 5 us max. Can the frequency be considered as 100% of its final value after this time?
Yes, that's the purpose of that parameter.
Please note that I am not ST.
JW
2020-03-10 09:30 AM
Hello @PRuss
The total HSI16 oscillator frequency drift over temperature (0 to 85°C) is -1% to 1% as mentioned in STM32L431 datasheet DS11453.
The HSI16 oscillator stabilization time is 5 µs max, so the frequency can reach 100% of its value after this time.
Best regards
Bouraoui
2020-03-10 10:00 AM
It's good to get clarification that this is the total drift, and the stabilization time is to 100%. Thanks!