I have PCB which support 3.3 V or 4 V power supply which I want to connect with ST25R3911B.
I want to run 4V power supply as it can provide more current and I assume outputpower of ST25R3911B will be higher on 4 V than on 3.3 V.
In data sheet of ST25R3911B it is stated that power supply is 2.4 to 5.5V so this should be fine. BUT when checking the registers 4.0V seems to be an invalid voltage:
IO configuration register 2
Bit 7 - sup3 V
0: 5 V supply
1: 3.3 V supply
5 V supply, range: 4.1 V to 5.5 V
3.3 V supply, range: 2.4 V to 3.6 V
min. 3.0 V for VHBR
So the question is what will happen when using 4.0V for 5V supply range? Will it not work at all?
Also when running PCB on battery voltage this will give voltage bewteen 4.0 to 3.0 V, which seems to be outside specification of ST25R3911B.
Can someone help how to use use ST25R3911B in my application?
