Telit Wireless Solutions FN990 Series - Page 31

FN990 Family Hardware Design Guide
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Page 31 of 83
2024-05-29
7 DIGITAL SECTION
7.1 Logic Levels
Unless otherwise specified, all FN990 Family interface circuits are 1.8V CMOS logic.
Only USIM interfaces are capable of dual voltage I/O.
The following tables show the logic level specifications used in the FN990 interface circuits.
The data specified in the tables below are valid throughout all drive strengths and the
whole temperature range.
Warning: Do not connect FN990 digital logic signal directly to the application
digital logic signals with a voltage higher than 2.134V for 1.8V CMOS signals.
1.8V Pins – Absolute Maximum Ratings
Table 21: Absolute Maximum Ratings - Not Functional
Parameter
Min
Max
Input level on any digital pin when
on
-
+2.134 V
Input voltage on analog pins when
on
-
+2.134 V
1.8V Standard GPIOs
Table 22: Operating Range - Interface Levels (1.8V CMOS)
Parameter
Min
Max
Unit
Comment
V
IH
Input high level
1.26
2.1
[V]
V
IL
Input low level
-0.3
0.54
[V]
V
OH
Output high level
1.35
1.8
[V]
V
OL
Output low level
0
0.45
[V]
1.8V UIM1/UIM2 Pins
Table 23: Operating Range - UIM Pins Working at 1.8V
Parameter
Min
Max
Unit
Comment
V
IH
Input high level
1.17
2.1
[V]
V
IL
Input low level
-0.3
0.63
[V]
V
OH
Output high level
1.35
1.8
[V]
V
OL
Output low level
0
0.45
[V]