User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 54 of 97
8. Logic Level Specifications
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 Telit GE/GC864-QUAD V2 AND
GE864-GPS interface circuits:
Absolute Maximum Ratings – Not Functional
Parameter
Min
Max
Input level on
any digital pin
when on
-0.3V +3.1V
Input voltage
on analog pins
when on
-0.3V +3.0 V
Operating Range – Interface Levels (2.8V CMOS)
GPS
signals
Level
Min
Max
Min
Max
Input high
level
2.1V 3.1V 1.82V 2.8V
Input low level 0V 0.5V 0V 0.98V
Output high
level
2.2V 3.0V 2.4V
Output low
level
0V 0.35V 0.4V
For 1,8V signals:
Operating Range – Interface Levels (1.8V CMOS)
GPS signals
Level
Min
Max
Min
Max
Input high
level
1.6V 2.2V 1.26V 3.1V
Input low level 0V 0.4V 0.45V
Output high
level
1,65V 2.2V 1.2V
Output low
level
0V 0.35V 0.45V