AnsweredAssumed Answered

MMA8652 Power Consumption

Question asked by Tuurbo 46 on Aug 24, 2016
Latest reply on Sep 7, 2016 by Jose Alberto Reyes Morales

Hi,

 

I have a strange power consumption problem with the MMA8652.  

 

When this chip is running, and is in standby state, it consumes 5.2mA.  

 

With the MMA8652 disabled the MCU consumes 2.2mA.

 

So MCU + MMA8652 running the board consumes 7.4mA.

 

The MMA8652 functions correctly and reads all angles etc, and this is repeated on more than 3 new build boards.

 

But I cannot understand why it consumes so much power.  One question I do have is, I have connected both of the interrupt lines interrupt 1 and 2.  I am using interrupt1 and this is active low.  So the MCU pin is setup as in and pull_up.  The second unused interrupt line interrupt2 pin is setup as in and pull_up.  Would this second unused interrupt pin be consuming all the power?

 

Any ideas or tests would be greatly appreciated.

 

Look forward to your reply.

 

Thanks.

 

Tuurbo46

Outcomes