User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.6 - 04/06/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 40 of 58
11.1 GPIO Logic levels
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the GE865 interface circuits:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any digital pin when on
(CMOS 2.8)
-0.3V +3.1V
Input level on any digital pin when on
(CMOS 1.8)
-0.3V +2.1V
Input voltage on analog pins when on -0.3V +3.0V
Operating Range - Interface levels (2.8V CMOS)
Level
Min
Max
Input high level 2.1V 3.0V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 1.8V signals:
Operating Range - Interface levels (1.8V CMOS)
Level
Min
Max
Input high level 1.6V 2.0V
Input low level 0V 0.4V
Output high level 1,65V 1.85V
Output low level 0V 0.35V