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User's Guide

ManualsBrandsTelit Communications ManualsElectronicsGSM 850, E-GSM 900, DCS 1800, PCS 1900, FDD IV, 2G/3.5G module
41424344454647484950
UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 46 of 78
10.3. 5V UART Level Transition
If the OEM application uses a microcontroller with a serial port (UART) that works at
a voltage different from 2.6 – 2.9V, then a circuitry has to adapt the different levels of
the two signal sets. 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:
TIP: TIP:
TIP:
This logic IC for the level translator and 2.6V pull-ups (not the 5V one) can be
powered directly from PWRMON line of UC864-E-AUTO / AWS-AUTO. Note that the
TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory.