Telit Wireless Solutions GM862-GPS - Manual (Page 23)

GM862-GPS Hardware User Guide
1vv0300728 Rev. 0 - 27/04/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 23 of 55
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: