Rainbow-electronics GE863-PY Bedienungsanleitung PDF herunterladen (Seite 44)

GE863 Hardware User Guide

1vv0300783 Rev.0 - 10/06/08

6.7 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:

TO TELIT

MODULE

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

of the GE863. Note that the TC7SZ07AE has open drain output, therefore the resistor R2 is mandatory.

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Rainbow-electronics GE863-PY Bedienungsanleitung Seite 44