Hi Team, i used to design STM32WB5MMG IC for my application. i have temperarture sensor MAX30102. i need to communicate with mcu with i2c .its working on 1v8.shall i connect directly to mcu i2c? or 3V3 to 1V8 level translator is required inbetween?

Forum|Forum|3 years ago
January 23, 2023
5 replies
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Foued_KH

ST Employee

Hello @AJAY S ,

The MAX30102 operates on a single 1.8V power supply and a separate 3.3V power supply for the internal LEDs. (DATASHEET)

So, try to provide 1V8 as a power supply for the sensor MAX30102.

Foued

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AJAY SAuthor

Associate II

this is my shematic design sir here i2c i use 1v8 is that okey to communicate STM32WBMMG chip. in between 3v3 to 1v8 level shifter is required? or not thats my doubt

Foued_KH

ST Employee

I think you are alright as recommended in the Datasheet of the sensor MAX30102 :

Foued

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AJAY SAuthor

Associate II

MY host is 3V3 sir,but my sensor is 1v8 thats why i had confussion.

Foued_KH

ST Employee

Try to use a regulator to provide 1V8 like the LDK130M-R.

I advice you take a look : Schematic diagram Motion MEMS and environmental sensor expansion board for STM32 Nucleo -

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Foued

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MM..1

Chief III

You can use it , because is in max ratings but need have this levels in range primary low under ...as you see High dont have defined up limit ... abs max ratings is 6V