Network Hardware User Manual

UC864-E Hardware User Guide
1vv0300766a Rev.1 - 31/01/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 42 of 51
Not all GPIO pads support all these three modes:
• 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 Logic level specifications
Where not specifically stated, all the interface circuits work at 2.6V CMOS logic levels.
The following table shows the logic level specifications used in the UC864-E interface circuits:
Absolute Maximum Ratings -Not Functional
Parameter
UC864-E
Min Max
Input level on any
digital pin when on
-0.3V +3.0V
Input voltage on
analog pins when on
-0.3V +3.0 V
For 2.6V CMOS signals;
Operating Range - Interface levels
Level
UC864-E
Min Max
Input high level 2.0V 2.9 V
Input low level -0.3V 0.6V
Output high level 2.2V 2.6V
Output low level 0V 0.35V
For 1.8V signals:
Operating Range - Interface levels (1.8V CMOS)
Level
UC864-E
Min Max
Input high level 1.5V 2.1V
Input low level -0.3V 0.5V
Output high level 1.4V 1.8V
Output low level 0V 0.35V