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1. mischianti.org › stm32-internal-rtc-clock-andSTM32: internal RTC, clock and battery backup (VBAT)

   mischianti.org › stm32-internal-rtc-clock-and

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   May 2, 2023 · VBAT operation is activated when VDD is not present. A symbiotic element is the VBAT pin, which allows the power of the device VBAT domain from an external battery, an external super-capacitor, or from VDD when no external battery and an external super-capacitor are present. The VBAT pin supplies the RTC and the backup registers.

2. electronics.stackexchange.com › questions › 256847How can I measure the VBAT voltage throuth ADC of STM32F103?

   electronics.stackexchange.com › questions › 256847

   Sep 9, 2016 · Sadly the STM32F103 series does not offer an internal ADC channel connected to VBAT, so you have to connect it externally. The problem arises as soon as you power off the microcontroller. If you were to connect the VBAT directly to another pin of the STM32 and turn off the main power supply, the protection diodes would start conducting and try to power the STM32.

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     STM32 Tutorial | Getting Started with STM32F103C & Arduino IDE

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     Getting started with the STM32 microcontroller - STM32F103C8T6 via Arduino

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     STM32 Arduino Tutorial - How to use the STM32F103C8T6 board with the Arduino IDE

     Sep 30, 2017

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4. electronics.stackexchange.com › questions › 225840microcontroller - Why should I connect Vbat pin of stm32f37x ...

   electronics.stackexchange.com › questions › 225840

   Apr 1, 2016 · RTC time is not kept in Stm32f103 by vbat. 1. RISC-V GD32VF103 battery backup domain. 0. STM32 Power configuration. Hot Network Questions Perfect ruler search

5. electronics.stackexchange.com › questions › 243228stm32 - VBAT circuit explanation - Electrical Engineering ...

   electronics.stackexchange.com › questions › 243228

   Jun 28, 2016 · Is it there to mimic a battery? No they're decoupling capacitors. It is good practice to have a decoupling capacitor near each VDD / VBAT pin of the IC.. The decoupling caps are needed with most ICs especially digital ICs because almost all of these use CMOS logic and this logic has the habit of drawing a current pulse from the supply when it switches.

6. www.st.com › resource › enSTM32F101xx, STM32F102xx and STM32F103xx low-power modes

   www.st.com › resource › en

   If no external battery is used in the application, VBAT must be connected externally to VDD. 1.1.3 Voltage regulator The voltage regulator is always enabled after reset. It works in three different modes depending on the application modes: in Run mode, the regulator supplies full power to the 1.8 V domain (core, memories and digital peripherals)

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7. vivonomicon.com › 2019/10/15 › reading-batteryReading Battery Voltage with the STM32’s ADC - Vivonomicon

   vivonomicon.com › 2019/10/15 › reading-battery

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   Oct 15, 2019 · The returned value is on a scale of 0 – 4095, because it is a 12-bit ADC. A value of zero means that the ADC reads zero volts, and a value of 4095 means that the ADC reads the supply voltage, which is 3.3V in this case. Since the voltage divider cuts the battery’s voltage in half, we can calculate the total voltage with this equation:

8. People also ask

   Does STM32F103 have an internal ADC channel?

   • Sadly the STM32F103 series does not offer an internal ADC channel connected to VBAT, so you have to connect it externally. The problem arises as soon as you power off the microcontroller.

   stm32 - How can I measure the VBAT voltage throuth ADC of STM32F1…

   electronics.stackexchange.com/questions/256847/how-can-i-measure-the-vbat-voltage-throuth-adc-of-stm32f103

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   How do you charge a STM32 battery?

   • Hooray, it’s fully charged! Our first step is designing an STM32 board with a battery charger, a battery connector, and an ADC connection to read the battery’s voltage. Most lithium batteries today have a charge voltage of 4.2V, which I like to think Douglas Adams would appreciate, but most STM32s have a maximum voltage of 3.6V.

   Reading Battery Voltage with the STM32’s ADC - Vivonomicon

   vivonomicon.com/2019/10/15/reading-battery-voltage-with-the-stm32s-adc/

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   Should a stm32f373x be connected to VDD?

   • I'm using a STM32f373x and with no battery. The product specification on page 77 says it should be connected to VDD. I have made a test with Vbat pin left open and the micro is working. Why I should connect Vbat to VDD and why it may work if it's open?

   microcontroller - Why should I connect Vbat pin of stm32f37x to VDD

   electronics.stackexchange.com/questions/225840/why-should-i-connect-vbat-pin-of-stm32f37x-to-vdd-when-there-is-no-battery

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   How does stm32f10xxx work?

   • are implemented at the end of the main.c and use the STM32F10xxx standard peripheral library. The RTC is running and, each ADC conversion and storage are gated by the RTC Alarm in the main loop. The RTC Alarm wakes up the STM32F10xxx from the WFE or STOP_WFE mode. the PC1 I/O shows the time taken by the ADC conversion and RTC Alarm register reload.

   STM32F101xx, STM32F102xx and STM32F103xx low-power modes

   www.st.com/resource/en/application_note/cd00171691-stm32f101xx-stm32f102xx-and-stm32f103xx-lowpower-modes-stmicroelectronics.pdf

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   Why is my stm32f10xxx not working?

   • This is because the debugger cannot take the hand while the STM32F10xxx is in low-power mode. Once this has been done, the boot pin must be configured back to BOOT FLASH. Measurement is then started by disconnecting and reconnecting the power supply. The power off/ power on reset sequence is necessary to avoid internal debug module overconsumption.

   STM32F101xx, STM32F102xx and STM32F103xx low-power modes

   www.st.com/resource/en/application_note/cd00171691-stm32f101xx-stm32f102xx-and-stm32f103xx-lowpower-modes-stmicroelectronics.pdf

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   How can stm32f10xxx reduce power consumption?

   • Sleep mode Another way of reducing power consumption is to switch to the STM32F10xxx Sleep mode when the application is waiting for an event or an interrupt. This example shows the possible STM32F10xxx clock configurations that can be used to optimize the power consumption of an application.

   STM32F101xx, STM32F102xx and STM32F103xx low-power modes

   www.st.com/resource/en/application_note/cd00171691-stm32f101xx-stm32f102xx-and-stm32f103xx-lowpower-modes-stmicroelectronics.pdf

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9. community.st.com › t5 › stm32-mcusHow to use the STM32 ADC's internal reference voltage

   community.st.com › t5 › stm32-mcus

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   Jan 30, 2024 · In some applications, specifically battery-powered ones, it is common for the supply voltage to drop as the battery discharges. Sometimes, both VDDA and VREF+ is powered directly by the battery. The problem with this is if the VDDA is based off of this battery voltage, then you may have difficulties to get precise voltage conversions from the ADC.