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!
