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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?

 

Regards,

Jason Yang

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