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User's Guide

ManualsBrandsTelit Communications ManualsElectronicsGSM 850, E-GSM 900, DCS 1800, PCS 1900, FDD IV, 2G/3.5G module
51525354555657585960
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 55 of 78
12.2. Using a GPIO Pad as Input
The GPIO pads, when used as inputs, can be connected to a digital output of another
device and report its status, provided this device has interface levels compatible with
the 2.6V CMOS levels of the GPIO.
If the digital output of the device is connected with the GPIO input, the pad has
interface levels different from the 2.6V CMOS. It can be buffered with an open
collector transistor with a 47KΩ pull-up resistor to 2.6V.
12.3. Using a GPIO Pad as Output
The GPIO pads, when used as outputs, can drive 2.6V CMOS digital devices or
compatible hardware. When set as outputs, the pads have a push-pull output and
therefore the pull-up resistor may be omitted.