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LIS3DH current consumption

Question asked by Jovanovic.Bojan.001 on Jan 16, 2017
Latest reply on Mar 22, 2018 by Tobias N

Hello guys,

 

I'm using LIS3DH accelerometer in my current design. I need it to detect the movement.

ODR is set to be 10Hz. According to this application note document (page 10), LIS3DH should consume about 4uA of the current in both Normal and Low power modes.

However, when I measure the current consumption, I get the value of about 78uA (@2.5V power supply). When I remove the accelerometer from the power rails and measure the current consumption of mcu in a sleep mode, I get the value of 3.2uA. This clearly implies that about 75uA of the current is consumed by the accelerometer.

 

The important thing to mention here is that I was supplying the mcu and accelerometer with 3.7V to 4.2V for some time. This is above the recommended supply range for LIS3DH (3.6V maximum). So, is it possible that this over-voltage permanently increased the current consumption? I have the desired functionality even when I supply the system with 3.7V to 4.2V.

 

Thank you very much for your time and effort.

 

Sincerely,

Bojan.

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