About BRieh.1

BRieh.1 · 2023-01-20

I have an ESC ECS-.327-CDX-1082 32.768KHz crystal on the LSE of an STM32F427.I have read and followed AN2867.All of the boards produced so far have had the oscillator come up initially.All of the boards subjected to thermal cycling (-20°C to +70°C) h...

BRieh.1 · 2023-04-13

Sorry for the delay.It looks as if it takes 2-10msec after the backup domain reset before the LSE is stable.

BRieh.1 · 2023-02-22

Also, the voltage provided by the supercap never dropped below 2.1 volts.

BRieh.1 · 2023-02-22

The solution is to do a backup domain reset. There appears to be a finite amount of time between the backup domain reset and the re-enabling of the LSE oscillator. We can now sucessfully recover from this event. Thanks to all of you who have contr...

BRieh.1 · 2023-01-30

Thermal cycle consists of 1.5 hours of Vdd power from ambient to +70°C then to 0°C when Vdd power is removed and the LSE +RTC are powered by Vbatt via the supercap for 1.5 hours. After the 1.5 hours, Vdd power is reapplied and LSE fails to start. L...

BRieh.1 · 2023-01-27

With the LSE up and running, I dripped some IPA over the circuit and indeed, the LSE stopped.When the IPA evaporated, the LSE begins to run again.

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I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.

Re: I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.

Re: I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.

Re: I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.

Re: I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.

Re: I am experiencing failures of the LSE oscillator on STM32F427VIT6 during thermal cycling.