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Telit GM862-QUAD/-QUAD-PY
Hardware User Guide
1vv0300692, Rev. ISSUE#0, - 04/10/2005
Reproduction forbidden without DAI Telecom written authorization – All Right reserved – Right of modification reserved
page 21 of 69
4.2 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, but since
the translation requires very few components, then also a discrete design can be suited. For example
a possible inexpensive translator circuit for a 5V driver can be:
and for a 5V receiver: