AnsweredAssumed Answered

mpc5643L power up sequence

Question asked by jinjingyang Employee on Sep 8, 2016
Latest reply on Sep 12, 2016 by jinjingyang

Dear Sir,


Customer use 3.3V to supply MPC5643L VDD_HV_IO/VDD_HV_ADV, and internal regulator based on 3.3V to supply VDD_LV.

And customer us 5.0V to supply VDD_HV_ADR.

The problem here is that if we supply 3.3V first, then after a while, turn on 5V for VDD_HV_ADR manually, the MCU looks not working.

Do we have any requirement on power up sequence? And what's the max allowed delay between VDD_HV/VDD_LV and VDD_HV_ADR?



Jason Yang