Telit Wireless Solutions GM862-GPS Manual do Utilizador descarregar pdf (Página 23)

GM862-GPS Hardware User Guide

1vv0300728 Rev. 0 - 27/04/06

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:

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