IIS2DH current consumption

[Ranjith Ravindra Shanbhag_2]

Posted on January 08, 2018 at 16:39

Hello,

I am using IIS2DH to work for my application. But the problem rises when I measure the current it is consuming. At 25Hz with 40ms INT2 duration and Low Power Enabled with all axis, I am observing a current a current of 500uA which is not according to what mentioned in the data sheet of IIS2DH. The configuration is shown below:

CTRL_REG1: 0x3F

CTRL_REG4: 0x20

CTRL_REG6: 0x20

INT2_CFG: 0x04

INT2_THS: 0x05

INT2_DUR: 0x01

The above configuration works perfectly for my application. However, it is consuming a lot of current. Am I missing something? Please help.

Also, could anyone explain to me as to how BOOT_I2 bit on  CTRL_REG6 work ? what is its function? Where can i find information about it? 

#iis2dh

[Miroslav BATEK]

Posted on January 08, 2018 at 16:47

Concerning the current consumption, can you please share the schematic?

The BOOT_I2 bit in CTRL_REG6 allow to see boot status on the INT2 pin, basically if you enable this bit the INT2 pin will be high during sensor boot-up and goes low after that.

[Ranjith Ravindra Shanbhag_2]

Posted on January 08, 2018 at 18:07

Hello Sir,

There is not much in the schematic. I just have the STEVAL-MKI168V1. connected to TI-Launchpad CC2640 . I have the launchpad powered on using a battery. The battery +ve terminal is connected to one terminal of the Ammeter(uA) and from the other terminal it is connected to the Launchpad. The Launchpad has 3.3V port from which the STEVAL-MKI168V1 is connected. The TI - Launchpad configures the accelerometer and enters shutdown mode.

Regards

[Miroslav BATEK]

Posted on January 08, 2018 at 18:41

Can you please measure the current consumption only of the sensor, connect the ammeter between 3.3V port on Launchpad and the VDD + VDD_IO of the sensor.

According to your description it seems you are only assuming the current is flowing into the sensor and the current consumption of the Launchpad is negligible.