Author Topic: LSM9DS1 power consumption  (Read 390 times)

savan8192

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LSM9DS1 power consumption
« on: October 23, 2019, 12:19:51 PM »
Hi everyone,

I have been playing with LSM9DS1 for quite some time. Now I want to reduce its power consumption.

Currently Moteino + LSM9DS1 draws about 60mA. If I disabled gyro, mag and two of the axis of Accelerometer and the current draw has gone down to 35-40mA. On disconnecting the LSM9DS1 entirely, the same sketch consumes 2-10 mA. My Moteino draws about 10-50uA to send a data packet to a gateway.

LSM9DS1 should draw typically 4.5mA. Any idea where I am going wrong?

I have connected VDD, GND, SDA, and SCL directly.

Thanks in advance


Felix

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Re: LSM9DS1 power consumption
« Reply #1 on: October 23, 2019, 10:39:38 PM »
LSM9DS1 should draw typically 4.5mA. Any idea where I am going wrong?
The VDD you have is 3.3V, correct?
Is this the LSM9DS1 LPL Breakout ?
All boards go through some basic testing to ensure they power up and can yield valid readings. But I do not test for current draw.
Is there anything particularly visually suspect with the board (perhaps a bridge or something like that)?

savan8192

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Re: LSM9DS1 power consumption
« Reply #2 on: October 24, 2019, 04:40:58 AM »
Hi Felix, thanks for your reply.

The VDD you have is 3.3V, correct?

Yes

Quote
Is this the LSM9DS1 LPL Breakout ?

Yes

Quote
All boards go through some basic testing to ensure they power up and can yield valid readings. But I do not test for current draw.

Board might be just fine, I may have to change the power mode in sketch?? - The datasheet mentions following

Quote
In the LSM9DS1 the accelerometer and gyroscope have two operating modes available:
only accelerometer active and gyroscope in power down or both accelerometer and
gyroscope sensors active at the same ODR. Switching from one mode to the other requires
one write operation: writing to CTRL_REG6_XL (20h), the accelerometer operates in
normal mode and the gyroscope is powered down, writing to CTRL_REG1_G (10h) both
accelerometer and gyroscope are activated at the same ODR.

Quote
Is there anything particularly visually suspect with the board (perhaps a bridge or something like that)?
Don't think so, attaching the picture for your reference - https://drive.google.com/file/d/1i1jMS1Yrxk49ASpEd0RGLaRP1JFHW6q_/view?usp=sharing

Felix

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Re: LSM9DS1 power consumption
« Reply #3 on: October 24, 2019, 10:39:55 AM »
Board looks good,
Have you tried it without the breadboard? Sometimes breadboards can cause all kinds of problems.

savan8192

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Re: LSM9DS1 power consumption
« Reply #4 on: October 28, 2019, 05:08:08 AM »
Hi Felix, I have tried it without breadboard - on a Veroboard. I have sent you a PM.