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MK24FN1M0VDC12 does not run from the fast clocks, VOUT33 dips

Question asked by JASPER SIKKEN on Mar 27, 2019
Latest reply on Mar 27, 2019 by Jing Pan

I have a problem that the MK24FN1M0VDC12 MCU does not start from the "fast" clocks. It can be programmed fine. It runs fine in debug mode stepping through the code. The VOUT33 which is 3.3V has dips down to 1.7V with 5ms interval and the MCU resets. I power the MK24FN1M0VDC12 with 5V on the VREGIN pin and the 3.3V LDO output on pin VOUT33 is connected to the VDD pins of the MCU. There is an 2.2uF ceramic capacitor on the output. According to datasheet/manual the LDO has two different maximum output currents. 120mA in RUN mode and 1mA in STANDBY mode.

 

Do you think my LDO was in STANDBY mode?

How do I change it to RUN mode?

Please note I have not programmed this MCU myself. When I was away my colleague tried to run the embedded code.

 

the VOUT33 dips to 1.7V with ~5ms interval

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