UART Connection - Voltage Translation

[awneil]

The AirPi UART connection to the Raspberry Pi header has a voltage shifter which uses the 3.3V from the Raspberry Pi as reference:

AirPi UART Voltage Shifter

AirPi_UART_Voltage_Shifter.png (8.47 Kio) Vu 8081 fois

Is it permissible to apply, say, 5V to the reference input - to allow connecting to a 5V microcontroller

Or 2.4V, or ...

[awneil]

Is it permissible to apply, say, 5V to the reference input - to allow connecting to a 5V microcontroller

That is, of course, instead of connecting a Raspberry Pi.