TMAG5273EVM: The accuracy of 3D printed rotate & push module

Kailun Liu

Expert 3103 points

Part Number: TMAG5273EVM
Other Parts Discussed in Thread: TMAG5273, TI-SCB,

Tool/software:

Hi team,

Here are some question during test with TMAG5273 and included 3D rotate, need you help to analyze it. Thanks!

1. When the knob is rotated (without telescoping), why do the values of the x, y, and z axes change?

2. When the knob is pressed, the z-axis changes only by 5 mT, and the range is set to 40 mT. Is this align with expectation?

3. TI GUI cannot modify the contents of the registers? but it can be written by I2C from the external MCU.

5 months ago

0 Kailun Liu 5 months ago

TI__Expert 3103 points

The data in question 1&2 is calculated by

0 Alicia Rosenberger 5 months ago in reply to Kailun Liu

TI__Genius 13760 points

Hi Kailun,

Thank you for posting to the Sensors forum!

Kailun Liu said:
1. When the knob is rotated (without telescoping), why do the values of the x, y, and z axes change?

The knob has a diametric magnet, so when you rotate the knob, the magnetic field changes. As a result, whenever conversions are triggered, the X, Y, and Z axes will change because the magnetic field is changing.

Kailun Liu said:
2. When the knob is pressed, the z-axis changes only by 5 mT, and the range is set to 40 mT. Is this align with expectation?

The range of the device is 40mT. This means that this is the maximum field that will be reported with this range and is unrelated to the expected magnetic field of the magnet. Seeing a change of 5mT when pressing down on the knob is fine.

Kailun Liu said:
3. TI GUI cannot modify the contents of the registers? but it can be written by I2C from the external MCU.

You should be able to update the registers of the TMAG5273 with the GUI on the register page, you just need to make sure that you have the TMAG5273EVM and the TI-SCB.

Best,

~Alicia