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LIS2DW12 reserved pin functionality

CMoeb.1
Associate

Hi,

I am debugging my custom board where I soldered an LIS2DW12 accelerometer on it. I forgot to pull the reserved pin ( 7 ) to ground as suggested in the datasheet.

This is how I connected it:

0693W00000SwLo5QAF.pngThis is how it should be connected:

0693W00000SwLoKQAV.pngIs this required, that the accelerometer can work properly? I cant find it on my I2C bus and don't know if it is related to this little mistake or maybe another, most likely soldering issue.

Edit: I2C is pulled up and decoupling capacitors are also there. Just on another section.

Thank you

1 ACCEPTED SOLUTION

Accepted Solutions
Eleon BORLINI
ST Employee

Hi @CMoeb.1​ ,

Yes, as stated in the datasheet, the RES pin has to be tied to GND... you might try to change the Vdd / VddIO level if you can, for example decreasing it to 1.8V (the pin should be less sensitive to lower voltages).

-Eleon

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1 REPLY 1
Eleon BORLINI
ST Employee

Hi @CMoeb.1​ ,

Yes, as stated in the datasheet, the RES pin has to be tied to GND... you might try to change the Vdd / VddIO level if you can, for example decreasing it to 1.8V (the pin should be less sensitive to lower voltages).

-Eleon