User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 36 of 78
8. Logic L
Logic LLogic L
Logic Level
evel evel
evel S
SS
Specifications
pecificationspecifications
pecifications
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 Telit
UC864-E-AUTO / AWS-AUTO interface circuits:
For 2.6V CMOS signals:
Absolute Maximum Ratings
Absolute Maximum Ratings Absolute Maximum Ratings
Absolute Maximum Ratings -
--
-Not Functional
Not FunctionalNot Functional
Not Functional
Parameter
ParameterParameter
Parameter
UC864
UC864UC864
UC864-
--
-E
EE
E-
--
-AUTO
AUTOAUTO
AUTO / AWS
/ AWS/ AWS
/ AWS-
--
-AUTO
AUTOAUTO
AUTO
Min
MinMin
Min Max
MaxMax
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
Ope
OpeOpe
Operating Range
rating Range rating Range
rating Range -
--
- Interface levels
Interface levelsInterface levels
Interface levels
Level
LevelLevel
Level
UC864
UC864UC864
UC864-
--
-E
EE
E-
--
-AUTO
AUTOAUTO
AUTO / AWS
/ AWS/ AWS
/ AWS-
--
-AUTO
AUTOAUTO
AUTO
Min
MinMin
Min Max
MaxMax
Max
Input high level 2.0V 2.9 V
Input low level -0.3V 0.6V
Output high level 2.15V 2.6V
Output low level 0V 0.45V
For 1,8V signals:
Operating Range
Operating Range Operating Range
Operating Range -
--
- Interface levels (1.8V CMOS)
Interface levels (1.8V CMOS)Interface levels (1.8V CMOS)
Interface levels (1.8V CMOS)
Lev
LevLev
Level
elel
el
UC864
UC864UC864
UC864-
--
-E
EE
E-
--
-AUTO
AUTOAUTO
AUTO / AWS
/ AWS/ AWS
/ AWS-
--
-AUTO
AUTOAUTO
AUTO
Min
MinMin
Min Max
MaxMax
Max
Input high level 1.5V 2.1V
Input low level -0.3V 0.5V
Output high level 1.35V 1.8V
Output low level 0V 0.45V
NOTE:
NOTE: NOTE:
NOTE:
Do not connect UC864-E-AUTO / AWS-AUTO’s digital logic signal directly to OEM’s
digital logic signal of with level higher than 3.0V.