GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.5
–
2017-05-11
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved.
Page 48 of 77
9.3.
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:
Note that the TC7SZ07AE has open drain output; therefore the
resistor R2 is mandatory.
