User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.9 – 07-02-2012
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 59 of 80
12.1 GPIO Logic levels
Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels.
The following table shows the logic level specifications used in the HE910 interface
circuits:
Absolute Maximum Ratings -Not Functional
Parameter
Min
Max
Input level on any digital pin (CMOS 1.8) with
respect to ground
-0.3V
3.1V
Operating Range - Interface levels (1.8V CMOS)
Level
Min
Max
Input high level
1.5V
1.9V
Input low level
0V
0.35V
Output high level
1.6V
1.9
Output low level
0V
0.2V