STM32L496 - Consumes more current when not flashed.

[Anuraglokhande]

Hi,

We have observation that STM32L496RGT6 takes around 32mA current when not even flashed first time. That is STM32 has purchased from supplier and assembled only. It takes 32mA.

 

When it is first time programmed when it takes less current.

What could be reason and how to solve first problem.

/Anurag

 

[KDJEM.1]

Hello ​@Anuraglokhande ;

 

Which low power mode are you using?

Could you please test an available PWR example.

 

Thank you.

Kaouthar

[waclawek.jan]

The ‘L4 is one of the STM32 which enter bootloader when run with “empty” FLASH.

And I’m willing to bet that the ‘L496 bootloader pulls the SPIx_MISO pins to VDD level hard, as soon as the bootloader enters, similarly to other ‘L4 and some other STM32 families too, even if AN2606 does not say so for this particular model.

Try the first powerup while holding NRST pin at GND, the supply current should be way lower. You may want to develop a method to program under hardware reset. In theory, this should be supported by STLink+CubeProgrammer; but the exact NRST pin control in that combination has been notoriously flaky and I personally gave up trying couple of years ago.

JW

 

[db16122]

what kind of programmer is used？Any error log？