ASM330LHB Gyroscope bias changed abnormally

[Deviprasad Bokkisam]

Hi,
We are using 4 ASM330LHB in our application. We have placed 4IMU's on PCB. We put the PCB in temperature chamber to observe the sensor behaviour during the temperature variation(cooling) with 1deg/min from 30 to 60 to -20.During this test all sensors in static only. During cooling, the sensor bias or readings changed significantly as shown in attached file. Why sensors readings changed significantly?.

Each plot has 4gyroscope readings. In attached file The last 3Plots are zoomed version of first 3plots respectively.

[Federica Bossi]

Hi @Deviprasad Bokkisam ,

I am not able to open the attached file. Can you attach some screenshots?

And also, can you share the schematic of your board with the 4 ASM330LHB?

Thanks!

[Deviprasad Bokkisam]

Hi, 

Thank you for reply.

Please find the attached screenshots. We designed schematics as per TN0018 document @ section6.10.

We have 4 sensors, each one communicated independently to MCU with 4SPI's.

The data taken with following configurations.

1.ODR 416Hz.

2.Range 500 deg/s, High performance mode.

3.voltage3.3V

[Federica Bossi]

Hi @Deviprasad Bokkisam ,

You are capturing data continuously as the climate chamber heats and cools, right? So the spikes you see I think are due to the noise from the climate chamber.

I recommend that you turn off the climate chamber once it has reached the temperature, acquire the sensor output, and turn it back on to go to the next temperature.

[Deviprasad Bokkisam]

Hi,

We also capture the data as you said above i.e during cooling from 60 to 10deg, at 10deg we turnoff the chamber  and problem(gyro reading are abnormal) is still exists. We also put another make sensor IMU which is on separate PCB with these 4IMU,we didn't get abnormal gyro readings for that sensor(less than ±1deg/s). The another make sensor was placed on separate encloser and it is on separate supply. 

In field conditions ,we cannot control the temperature raises and falls. Please escalate the problem to technical team to solve the issue. 

[Federica Bossi]

Hi @Deviprasad Bokkisam ,

It is not an issue because we don't replicate a similar behavior in our tests so it could be related to your tests or board design. 

I suggest you contact your local FAE or open a ticket to the online support system at this link to get quickly support.

[Deviprasad Bokkisam]

Please provide the contact details of FAE.I am from India.

Do you test all production IMU samples with temperature rise and cool from -40 to 105deg?

[Federica Bossi]

Hi @Deviprasad Bokkisam ,

Please contact the online support system at this link and open a ticket. They can help you :)