User's Manual

HC864-AUTO Hardware User Guide
1vv0300946 Rev.4 – 2012-12-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 39 of 77
7. Logic Level Specifications
The following table shows the logic level specifications used in the Telit HC864-AUTO
interface circuits:
NOTE:
Do not connect HC864-AUTO’s digital logic signal directly to OEM’s digital logic signal of
with level higher than 3.0V for 2.6V CMOS signals.
Do not connect HC864-AUTO’s digital logic signal directly to OEM’s digital logic signal of
with level higher than 2.7V for 1.8V CMOS signals.
For 2.6V CMOS signals:
Absolute Maximum Ratings -Not Functional
HC864-AUTO
Parameter
Min Max
Input level on any
digital pin when on
-0.3V +3.0V
Input voltage on
analog pins when on
-0.3V +2.7 V
Operating Range - Interface levels
HC864-AUTO
Level
Min Max
Input high level 2.0V 2.6 V
Input low level -0.3V 0.6V
Output high level 2.2V 2.6V
Output low level 0V 0.4V
For 1,8V CMOS signals:
Absolute Maximum Ratings -Not Functional
HC864-AUTO
Parameter
Min Max
Input level on any
digital pin when on
-0.3V +2.7V
Input voltage on
analog pins when on
-0.3V +2.7 V
Operating Range - Interface levels (1.8V CMOS)