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 72 of 97
Not all GPIO pads support all these three modes:
• GPIO2 supports all three modes and can be input,
output, Jamming Detect Output (Alternate function)
• 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 tables show the logic level specifications used
in the GE/GC864-QUAD V2 and GE864-GPSinterface 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)
Level
Min
Max
Input high
level
2.1V 3.1V
Input low level 0V 0.5V
Output high
level
2.2V 3.0V
Output low
level
0V 0.35V