A few questions:
1/PWRON trig level are available in Data manual table 3-4
The pin is using VIO and is VBAT compiliant.
VIL MAX = 1.8 x 0.35VIH MIN = 0.65 * 1.8
2/Table 3-3VBAT Min = 2.7VVBAT MAX = 4.5V
3/ MAX PWRON is VBAT. If power on exeeds VBAT there is a diode between VBAT and PWRON which will be forward biased and it will clamt the PWRON level to VBAT + ~0.6V
4/ Supply reference for VBAT is VIO.
Hope this is helpfull, don't forget to close the thread if the questions are answered.
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