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Current Consumption of STM32L-DISCOVERY in low Power Modes

Question asked by Ahmed Talaat on Aug 11, 2013
Latest reply on Aug 12, 2013 by Clive One
I am using the STM32L-DISCOVERY evaluation board, and I made JP1 off as per the below instructions from the evaluation board user manual:

JP1 OFF: the STM32L152 is directly powered, IDD measurement circuit is bypassed.
Note: When jumper JP1 is removed the current consumption of the STM32L152 can be measured by connecting an ammeter between jumper pin 1 and pin 2 of JP1.

I am using the following code and measure the current consumed using an Ammeter. I wrote on the right side comment with the actual current consumed:

int main(void)
    /* Configure PB6 and PB7 as output */
    /* Configure PA0 in interrupt mode */
    /* Infinite loop */
  while (1)
//      PWR_EnterSleepMode(PWR_Regulator_LowPower,PWR_SLEEPEntry_WFI);    // 2.3mA
//      PWR_EnterSTANDBYMode();        // 0.7mA
      PWR_EnterSTOPMode(PWR_Regulator_LowPower,PWR_STOPEntry_WFI);    // 0.7mA
  return 0;

These value are far from the expected values that are documented in the STM32L documentation which I expect to be few micro amps in stop and standby modes.
  • Is there any other part of the evaluation board that is consuming this current?
  • Is there something wrong in my code?
I am coming from an MSP430 background which consumes 2-3uA in its equivalent low power mode.

Thank you.