Rainbow-electronics GM862-QUAD-PY Instrukcja Użytkownika Pobierz pdf (Strona 34)

GM862-QUAD / PY Hardware User Guide

1vv0300748 Rev. 5 - 20/09/07

7.2 5V UART level translation

If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different

from 2.8 - 3V, then a circuitry has to be provided to adapt the different levels of the two set of signals.

As for the RS232 translation there are a multitude of single chip translators. For example a possible

translator circuit for a 5V TRANSMITTER/RECEIVER can be:

TIP: This logic IC for the level translator and 2.8V pull-ups (not the 5V one) can be powered directly from PWRMON

line of the GM862-QUAD / PY. Note that the TC7SZ07AE has open drain output, therefore the resistor R2 is

mandatory.

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Rainbow-electronics GM862-QUAD-PY Instrukcja Użytkownika Strona 34