DRV8837: Inquiry about DC Auto Iris Control

WSJ

Prodigy 190 points

Part Number: DRV8837

Tool/software:

Hi.

I am modifying the zoom lens control circuit.

Previously, the zoom, focus, and iris were all "Motrized", so I used DRV8837DSGT to control them.

The iris of the zoom lens has been changed to "DC Auto Iris".

1. Can I use DRV8837 as the iris control circuit?

2. If modification is needed, can you recommend a DC Auto Iris driver?

3. Can you provide a sample schematic?

4. The zoom lens information is as follows:

Regards

10 months ago

0 Ibinu Alaudeen Nadeera 10 months ago

TI__Genius 13561 points

Hi,

Thanks for your question. The device expert from my team will look into this and get back to you.

Thanks,

Ibinu

0 Jacob Thompson 10 months ago

TI__Mastermind 23451 points

Hello,

I could be wrong, but I suspect this means that the motor driver is integrated into the iris mechanism now. I suspect the "DRIVE+" and "DRIVE-" are VM and GND on our driver, and CONTROL- / CONTROL+ are IN1 and IN2 on our driver. If that is the case, you won't need a motor driver like DRV8837 at all - you'll just put two GPIO signals from the MCU to the CONTROL+/- pins and that will drive the iris.

You'll need to check with the iris provider to confirm this though, I could be wrong.

If I'm wrong and it still needs our motor driver I recommend the newer device DRV8210. The DSG package is Pin2Pin compatible with DRV8837, and there's an option for a 6-pin DRL package for even less cost.

For sample schematics see the EVM, like https://www.ti.com/tool/DRV8210EVM

Best,

Jacob

0 Jacob Thompson 9 months ago in reply to Jacob Thompson

TI__Mastermind 23451 points

WSJ, do you have any update here?

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DRV8837: Inquiry about DC Auto Iris Control