About Dhanoosh

Dhanoosh · 2023-11-06

Hi community,I'm having a STM32F407VET6 PCB board where VBAT is connected to a 10 uF decoupling capacitor [Instead of recommended 100 nF capacitor].in order to achieve some backup time when both the coin cell and 3.3V are not connected.My RTC is work...

Dhanoosh · 2023-12-11

Hi TDK,Please let me know if you have any idea to resolve my RTC issue addressed at https://community.st.com/t5/stm32-mcus-products/stm32f4-rtc-issue-when-coincell-vbat-is-removed/m-p/605408/thread-id/226795Thanks,Dhanoosh B

Dhanoosh · 2023-12-08

Hi JWI am using the STM32 Cube IDE to generate code. In that RTC goes into error state based on the above circumstances at RTC_EnterInitMode. I will write the generated function below HAL_StatusTypeDef RTC_EnterInitMode(RTC_HandleTypeDef *hrtc) { ...

Dhanoosh · 2023-11-06

Gotcha, Thanks Evangelist!

Dhanoosh · 2023-11-06

The datasheet describes the voltage level in Vbat as ranging from 1.65 to 3.6 volts. Let me change the capacitor as suggested and update the findings.

Dhanoosh · 2023-11-06

Hi LCE,Thanks for the response. I also wanted to know why the RTC goes to error handler mode after a particular power cycle duration [7 seconds]. Does increasing the capacitance fix the error handling issue?

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Re: STM32F4 RTC ISSUE WHEN COINCELL [VBAT] IS REMOVED