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AN883

Part Number	AN883
Manufacturer	Silicon Laboratories
Description	LOW-COST I2C LEVEL TRANSLATOR
Published	Apr 6, 2018
Detailed Description	AN883 LOW-COST I2C LEVEL TRANSLATOR 1. Introduction This applications note discusses a low-cost circuit for I2C level ...
Datasheet	AN883 PDF File

Overview

AN883 LOW-COST I2C LEVEL TRANSLATOR 1.
Introduction This applications note discusses a low-cost circuit for I2C level translation.
This circuit was developed for the Si701x, Si702x, and Si703x humidity sensors but will work in many applications.
This circuit provides I2C level translation from a higher voltage supply, such as 5 V, to a lower voltage, supply such as 1.
8 or 3.
3 V.
In addition, the optional emitter follower circuit provides a low-voltage power supply rail from the higher 5 V supply.
Note that some devices allow for higher voltage tolerance on I2C inputs.
For example, the Si7034 has a 3.
3 V tolerant I2C interface, so the level translation is only required for 5 V I2C designs.
...

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