LIS2DM I2C and low power

r239955_st · ‎2014-06-13

Posted on June 13, 2014 at 10:07

after power up the LIS2DM the current consumption is about 100uA ?!

The connection is:

Pin1 : SCL with a external 4K7 to 3V

Pin2 : SDA with a external 4K7 to 3V

Pin3 : SA0 connected to GND

Pin4 : /CS connected to 3V

Pin5: INT2 open

Pin6: INT1 to Input Port uP

Pin7,8: 3V

Pin9-14: GND

Could it be that there is an internal pull-up on Pin3 and I should connect the SA0 line to 3V to get a low power consumption ?

#lis2dm-i2c-sa0

rabryan · ‎2015-02-10

Posted on February 10, 2015 at 23:19

Did you ever get a definitive answer to this? I'm seeing about 100uA higher power consumption with an LIS2DH12 than I would expect and this seems like it could be the issue. And 100 uA corresponds exactly a with 3V across a 30K pullup.

mharvey · ‎2015-03-19

Posted on March 19, 2015 at 19:27

We encountered the same problem with the LIS3DH. The SA0 has an internal pull up. If you ground it you will draw the extra current. We float it to set that address bit = 1 on the I2C bus.