how to make RTC active when power is off

[RGate.0]

I am going to use STM32F030k6t6. IC is not having VBAT pin. Please suggest how to make RTC active when power is off

[waclawek.jan]

The 'F030 is a cut-down version of the 'F031/'F051, with some features deliberately left off.

In other words, you have to chose an STM32 model which has the VBAT pin.

JW

[RGate.0]

Dear Waclawek.jan sir,

Thanks for your reply .

I want to know is there any solution to use stm32f030k6t6 as clock. As i want to make cost effective application.

[waclawek.jan]

You can have an external switchover (maybe just a diode or two) from primary power source to battery, and write the software so that if primary source goes away the mcu goes into some of the low-power mode.

However, the battery consumption will be higher than it would be using a mcu with VBAT pin.

jW

[RGate.0]

Please share the details or link about how to deal with low power modes for respective microcontroller. it will be very helpful for me

[Piranha]

Isn't STM32L010K4 or similar chips more appropriate, if energy consumption and low power modes are important? The price is approximately the same. Are there some other special requirements?