Telit Wireless Solutions GE864-QUAD/PY, User Manual

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GE865 Hardware User Guide
1vv0300799 Rev.9 – 27-07-2009
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 48 of 70
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GPIO5 supports all three modes and can be input, output, RFTX monitor output
(Alternate function)
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GPIO6 supports all three modes and can be input, output, alarm output
(Alternate function)
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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 3.0V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
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
Output low level 0V 0.35V