DRV5032: DRV5032 Application Issue

Ian Wang

Mastermind 30120 points

Part Number: DRV5032

Hi Sir,

Customer using DRV5032 found sensor issue, some devices cannot detect success.

We check ID tolerance looks fine, guess if possible cause by Bop higher. Would you pls kindly advise?

Hall element (mT)

close	5.0mT
open	0.09mT

Thanks, Ian.

over 5 years ago

0 Julio Apps over 5 years ago

TI__Expert 3665 points

HI Ian,

Thanks for reaching out. I agree with your comment, if i look at that Flux density picture you attached the DRV5032 seems to be in a region where the flux density will be between 2-4mT. You may not have enough flux density to change the output of the IC.

What is the DRV5032 variation you are using for this application?

0 Ian Wang over 5 years ago in reply to Julio Apps

TI__Mastermind 30120 points

Hi Sir,

The application is TWS.

Customer asked if TI can help to test and prove "hall sensor threshold" is limit?

Thanks,Ian.

0 Julio Apps over 5 years ago in reply to Ian Wang

TI__Expert 3665 points

Hi Ian,

I dont think there is a need to test, i can clearly see in the graph that the flux density region the IC is in is not enough to change the state of the output. They will have to be mindful of he BOP and BRP ranges. One thing your customer can do is calculate the min and max distance the magnet can be from the sensor using the calculator available in the product folder. Below i attached an example using a ferrite type magnetic material.

https://www.ti.com/product/DRV5032

Also, if you need further clarification on these release point specifications of these latches you can find it here in this short training video:

https://training.ti.com/ti-precision-labs-magnetic-sensors-latches-switches-operating-release-point?context=1139747-1139746-1137749-1139634-1137743

0 Ian Wang over 5 years ago in reply to Julio Apps

TI__Mastermind 30120 points

Hi Sir,

customer asking about,

1. can we help measure BOP?

2. Do you have experience what buffer need to be added in design stage to avoid kind of issue?

Thanks, Thanks.

0 Julio Apps over 5 years ago in reply to Ian Wang

TI__Expert 3665 points

Ian,

No i cannot help measure BOP, please refer to the above recommended tools. As far as a buffer goes your customer just needs to verify that you are above the BOP threshold considering their operating conditions and lifetime of the product. They should reference the magnet provider datasheet and verify that will not demagnetize significantly over time.

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DRV5032: DRV5032 Application Issue