User's Guide

LE940B6 HW User Guide
Rev. 2.02
Page 44 of 111 2020-01-10
Logic Level Specifications
Unless otherwise specified, all the interface circuits of the LE940B6 are 1.8V CMOS logic.
Only few specific interfaces (such as MAC, USIM and SD Card) are capable of dual
voltage I/O.
The following tables show the logic level specifications used in the LE940B6 interface
circuits. The data specified in the tables below is valid throughout all drive strengths and
the entire temperature ranges.
NOTE:
Do not connect LE940B6 digital logic signals directly to OEM digital logic
signals with a level higher than 2.7V for 1.8V CMOS signals.
4.3.1. 1.8V Standard GPIOs
Table 10: Absolute Maximum Ratings – Not Functional
Parameter
Min
Max
Input level on standard GPIOs when on
-0.3V
+2.3V
Table 11: Operating Range – Interface Levels (1.8V CMOS)
Parameter
Min
Max
Input high level
1.26V
2.0V
Input low level
-0.2V
0.36V
Output high level
1.6V
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Output low level
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0.2V
4.3.2. 1.8V I2C Pads
Table 12: Operating Range – 1.8V I2C Pads
Parameter
Min
Max
Input high level
1.26V
2.3V
Input low level
-0.3V
0.54V
Output high level
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