Strange MKW41Z512 behavior on custom PCB

domenico_virgil — Thu, 24 Feb 2022 17:55:13 GMT

Hi. I’m using MKW41Z512 mcu on a custom board developed by our team.

These are some features of the board:

- It's powered by a Li-Po battery;

- the battery is recharged using USB power by means an on board battery charger;

- mcu hardware reset when USB cable is connected.

We had some problems with the microcontroller., in particular there are two types of problems:

1. on some boards mcu resets repeatedly. I see a sawtooth signal 1.6 V level on reset pin. The board starts working again after reprogramming mcu.

2. on some boards, internal mcu DCDC stops regulating. I measured battery level on VDD_1P8OUT and +3.32 V on VDD_1P45OUT instead of +1.8 V and +1.5 V respectively. The boards starts working again only after battery disconnection.

Can you help us to find what aspects should we check? Thank you!

Re: Strange MKW41Z512 behavior on custom PCB

mario_castaneda — Mon, 28 Feb 2022 19:53:16 GMT

Hi @domenico_virgil,

It seems that you have some issues with your hardware design.

I sent you a direct message.

Regards,

Mario

topic Re: Strange MKW41Z512 behavior on custom PCB in Kinetis Microcontrollers

Strange MKW41Z512 behavior on custom PCB

Re: Strange MKW41Z512 behavior on custom PCB