DRV3901-Q1: Way of triggering

Ruofei Shen

Part Number: DRV3901-Q1

Tool/software:

Hi Ti team,

We are considering using this DRV3901 for our testing. For way to implement triggering I would like to understand if only using HW pin (logic high or PWM) without SPI communication can make this IC work?

Thanks

7 months ago

0 Keerthivasan Kumanan 7 months ago

TI__Mastermind 18505 points

Hi Ruofei,

Please see all the possible ways to trigger:

TRG1 and TRG2 and dedicated pins for triggering and can be also triggered with SPI command.

Best,

Keerthi

0 Ruofei Shen 7 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthi,

Thank you for your quick response. To simplify my application, if I just send signals to trigger pins while leaving SPI pin unconnected to get rid of communication, can IC still work and successfully triggered?

0 Ibinu Alaudeen Nadeera 7 months ago in reply to Ruofei Shen

TI__Genius 11731 points

Hi Ruofei,

Just to clarify, while the device starts up the device needs to be configured to make sure that the trigger modes are from pins. Once the device is configured properly, the device can deploy without any external SPI command.

Hope that clarifies.

Thanks,

Ibinu

0 Ruofei Shen 7 months ago in reply to Ibinu Alaudeen Nadeera

Prodigy 10 points

Hi Ibinu,

Thanks for the explanation. Let's say if I would like to configure TRG_SEL to 1h to use TRIG_PIN only. Do I need to configure this each time the IC starts up or does IC have memory that can save this configuration so that we just need to configure it only ONCE and good for all. That means from then on we can deploy directly without SPI and don't need to reconfigure after re-start up.

Thanks

Ruofei

0 Keerthivasan Kumanan 7 months ago in reply to Ruofei Shen

TI__Mastermind 18505 points

Hi Ruofei,

The device can technically be configured at startup, but to run diagnostics periodically you need SPI.

Best,

Keerthi

0 Ruofei Shen 7 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Thank you Keerthi,

Just to clarify, configuration will not be saved in the NVM so each time the chip starts up it needs to be reconfigured ?

Thanks

0 Keerthivasan Kumanan 7 months ago in reply to Ruofei Shen

TI__Mastermind 18505 points

Hi Ruofei,

There is no NVM, so the setup needs to be reconfigured every time the chip starts up.

Best,

Keerthi

0 Ruofei Shen 7 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Thanks Keerthi,

For the abnormal deployment example shown in the datasheet like below:

Can this be created by an good IC intentionally or it is caused by a real failure occurred somewhere?

0 Keerthivasan Kumanan 7 months ago in reply to Ruofei Shen

TI__Mastermind 18505 points

Hi Ruofei,

Just to clarify are you asking if the abnormal deployment is a feature?

Or are you asking if this can this be reproduced with some kind of fault injection with the IC?

Best,

Keerthi

0 Ruofei Shen 7 months ago in reply to Keerthivasan Kumanan

Prodigy 10 points

Hi Keerthi,

Sorry for confusion, actually I am asking both of what you mentioned above. Is either of them feasible?

Thanks

0 Shinya Morita 7 months ago in reply to Ruofei Shen

TI__Mastermind 44795 points

Hi,

Due to US national holiday, please expect some delay for our response.

0 Keerthivasan Kumanan 6 months ago in reply to Shinya Morita

TI__Mastermind 18505 points

Hi Ruofei,

It is not a feature. I am looking into how we tested this on our side. I will get back to you on this.

Best,

Keerthi

0 Ibinu Alaudeen Nadeera 6 months ago in reply to Keerthivasan Kumanan

TI__Genius 11731 points

Hi Ruofei,

When the pyro fuse is deployed the impedance will change and eventually will open up after the time mentioned by pyro fuse manufacturing. During this process the impedance can vary such that the current varies.

Hope this clarifies the question.

Thanks
Ibinu

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DRV3901-Q1: Way of triggering