Type of Battery for STM32U585 MCU

SSiva.11 · ‎2021-09-16

Hi All,

We are planning to use STM32U585 series MCU. while going through the datasheet it is mentioned as Vbat with internal charging circuit. Whether we use non rechargeable battery or Supercapacitor for Vbat pin? or it can be used only rechargeable battery ,

if we use non rechargeable battery or super cap, shall we able disable the charging of vbat?

Peter BENSCH · ‎2021-09-16

The internal circuitry consists of a resistor of either 1.5k or 5kohms as descibed in RM0456, section 10.4.7. It can be enabled (to charge e.g. supercaps) or disabled (to use e.g. a non rechargable battery).

[edit]corrected chapter no, thx to @TDK[/edit]

Good luck!

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/Peter

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TDK · ‎2021-09-16

You can use any battery or supercapacitor which provides the appropriate voltage to that pin.

~~Not sure what you mean by disable charging. The STM32 isn't going to try to charge the battery for you.~~

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TDK · ‎2021-09-16

This should read section 10.4.7. I learned something.

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