LIS2DW12 i2C communication issues

Forum|Forum|8 years ago
January 26, 2018
2 replies
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Posted on January 26, 2018 at 10:45

Hi to all,

We are usin this accel over i2c with this configuration:

* Separate VDD and VDDIO (this one is attached to CS).

* SDA and SCL are mounted with a external pull up resistor of 10K.

* SDO/SA0 is left unconnected (it is supposed to have an internall pull up).

Is there any power up sequence to ensure the i2c mode is properly configured/selected? Any delay between VDD and VDDIO?

Powering up both lines to 3V, the VDDIO is not 3V, its in 1.9V or similar. If we disconnect CS from VDDIO. In CS we get a '0' and in VDDIO 3V. Is this normal? And the internall pull up resistor does not lift the pin to high?

Is there any example of how to connect the accel for i2c communications? any keynote for the power up?

Attached is an image of the mounted sensor were the marking is a dot, a datamatrix and a 'T'.

Thanks in advance for your help.

#lis2dw12 #i2c

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Best answer by Miroslav BATEK

Posted on January 29, 2018 at 10:14

The schematics is OK, but I compered your schematic, the image of your board and pin out in datasheet, I see they are not aligned.

I added the pin description in your picture and I see for example the CS and SDO pins are connect to your interrupt circuit. So most of the pins have wrong connection.