Josh Curry

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8 years, 10 months ago.

FRDM-KL46Z (MKL46Z256VLL4MCU) High power consumption in deep sleep.

I'm currently doing a project where i've got a MKL46Z256VLL4MCU microprocessor on an external board, and am programming it using it's development board, the FRDM-KL46Z.

I'm noticing extremely high current in supposed deep sleep mode (about 3mA). I'm using the WakeUp Library (https://developer.mbed.org/users/Sissors/code/WakeUp/) as recommended in other posts, but this doesn't seem to reduce the power consumption.

When I'm testing the current, I disconnect the programmer totally to prevent it still being in debug mode, and power cycle the MCU.

The example code i'm testing is here:

  1. include "mbed.h"
  2. include "WakeUp.h"

int main() { WakeUp::calibrate();

while (true) {

Set wakeup time for 10 seconds WakeUp::set_ms(10000);

Enter deepsleep, the program won't go beyond this point until it is woken up deepsleep(); } }

Any ideas why I'm getting such high current usage in a supposed sleep mode? Any help/suggestions would be greatly appreciated!

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