STM32H7 very hot

[jean]

Hello dear community,

I've started using STM32H743VGT6 on a custom board I've made.

I'm testing the hardware now and I quickly detected that the temperature is really high (approx. 70°c on the top of the chip package).

I have another board, based on a STM32H743BIT6, quite similar, and the temperature of this one seems normal (approx. 40°C)

• dividing the H7 clock speed by 2 really helps to reduce the temperature, but my original clock config seems right (tested with cubeMX)
• It's not easy for me to measure the current drawn by the H7, as the 3V3 is used by many other devices

Have you ever experienced that kind of issue?

Thanks a lot, have a nice day!

Jean

[jean]

Thanks for the AN5337 info! That's interesting. I've never thought about using a lower frequency. Every previous project using STM32F was running at max speed and the heat was low. Even my STM32H743 package running at 480MHz in a big package (LQFP-208) was not heating.

So indeed I might use a lower system frequency for my STM32H743 LQFP-100

I already have a wide, solid ground plane under the H7. I will also think about a place for a heat-sink.

[tawat25]

Thank you this topic i have design my board with stm32H723  i need maximum adc speed  so set clock to 550 Mhz but the chip is hot . i have down to 400 Mhz   founded temperature cool down . but adc sample rate down too. why?

[Tesla DeLorean]

Synchronous?

Check clock sources and dividers servicing the ADC.

Here we tend to unpack the RCC settings to confirm we understand the Reference Manual and what we ended up with.