DRV8884: Quad level input

NAOKI AOYAMA

Guru 11215 points

Part Number: DRV8884

Hello,

Our customer use the DRV8884.

The customer apply voltage to Decay pin.

Perhaps, there are three threshold voltage at Decay pin.

Vth1: between Vi1 and Vi2

Vth2: between Vi2 and Vi3

Vth3 between Vi3 and Vi4

Could you tell me the value of threshold voltage?

I know it operates correctly by input 100mV, 300mV, 1V, 2.9V.

The customer want to know the tolerance.

one more question

When the customer use Slow/Slow decay, is it possible to left open the Decay pin?

Best Regards,

Naoki Aoyama

over 6 years ago

0 Rick Duncan over 6 years ago

TI__Guru** 114905 points

Hi Aoyama-san,

We will investigate and reply soon.

0 NAOKI AOYAMA over 6 years ago in reply to Rick Duncan

Guru 11215 points

Hi Rick-san,

Is there any update?

Regards,
Naoki Aoyama

0 Rick Duncan over 6 years ago in reply to NAOKI AOYAMA

TI__Guru** 114905 points

Hi Aoyama-san,

I did not find the data, but will continue looking for it. It may take a few more days.

Does the customer have a specific concern?

"one more question

When the customer use Slow/Slow decay, is it possible to left open the Decay pin?"

Yes, it is possible.

0 NAOKI AOYAMA over 6 years ago in reply to Rick Duncan

Guru 11215 points

Hi Rick-san,

Thank you for your reply.

"Does the customer have a specific concern?"
No.
In some case, the customer will use a DAC to configure Decay mode.
So the customer want to know the Vth and tolerance.

Thank you for your giving the answer about setting Slow/Slow decay.

Regards,
Naoki Aoyama

0 NAOKI AOYAMA over 6 years ago in reply to NAOKI AOYAMA

Guru 11215 points

Hi Rick-san,

I talk with the customer about use case.
In case of using resistor, the customer use E24 series 5% tolerance resistor
for the purpose to reduce the cost.
So the customer will use
4.7kohm instead of 5kohm
47kohm instead of 45kohm.
Because the customer can not judge that it set Decay mode correctly using the value of the resistor,
the customer want to know the Vth.

Regards,
Naoki Aoyama

0 Rick Duncan over 6 years ago in reply to NAOKI AOYAMA

TI__Guru** 114905 points

Hi Aoyama-san,

Sorry for the delay. We are still researching this data. I hope to have a response by August 23rd.

0 NAOKI AOYAMA over 6 years ago in reply to Rick Duncan

Guru 11215 points

Hello Rick-san,

Is there any update?

Another customer ask me same question.

I think there is some data like bellow.

*For example : DP83822

4level_input.pdf

Regards,

Naoki Aoyama

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DRV8884: Quad level input