IIS2MDC INT/DRDY configuration when unused

[npreel]

Hello, 

 

I am currently using the IIS2MDC in my design with the following configuration:

 

As you can see, I am not using the INT/DRDY pin, so it is left unconnected. However, in idle mode, I am measuring an abnormal current consumption of around 400 µA. I noticed that this extra consumption disappears completely when the INT/DRDY pin is tied to GND via a pull-down resistor.

The datasheet states that this pin is configured as a High-Z output by default. I do not understand how this floating setup could cause such a high leakage current. Furthermore, I could not find any specific hardware design recommendations in the datasheet regarding how to handle this pin when unused.

I'd really appreciate it if someone could help me understand this behavior. What would be your recommended hardware setup when the INT/DRDY pin isn't used?

Thank you in advance for your support.

Best regards,

[Federica Bossi]

Hi ​@npreel ,

It’s better to connext the INT to GND through a pull down or pull up resistor depending on how you set the pin.