What is VPORD range of S12XEG128?

[jtpark]

Hello,

I checked Power on Reset graph of S12XEG128 as the below,

but cannot find voltage range of VPORD in reference manual.

Would you please advise for me?

Thanks.

[RadekS · Accepted solution]

Hi J.T.

You are right, the VPORD voltage level is not specified in RM.

The Internal core voltage which is what the POR circuit monitors can vary due to load, temperature and voltage drop over the internal regulator. Thus Vpord as a function of the internal voltage can't be exactly defined.

The upper extreme of VDDR value which refers to Vpord level (for 180nm S12X devices) is around 1.35V.

The deassert level may be tested by decreasing power supply voltage when MCU is in stop mode (VDDA, VDDX, VDDR monitors are not active).

Typically, we can assume POR levels around 1.0~1.2V at VDDR – this cannot be externally measured.

I hope it helps you.

Have a great day,
Radek

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