User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.28 – 2015-06-24
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 73 of 73
14.1 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 2.1V
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