User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.11 – 13-07-2010
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 55 of 82
GPIO4 supports all three modes and can be input, output, RF Transmission
Control (Alternate function)
GPIO5 supports all three modes and can be input, output, RFTX monitor output
(Alternate function)
GPIO6 supports all three modes and can be input, output, alarm output
(Alternate function)
GPIO7 supports all three modes and can be input, output, buzzer output
(Alternate function)
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
3.1V
Input low level
0V
0.5V
Output high level
2.2V
3.1V
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