• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 310 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

DRV2605: Questions in DRV2605

DRV2605: Some questions of the DRV2605

Scott%20Chien
Prodigy 230 points
Part Number: DRV2605
Other Parts Discussed in Thread: DRV2625

Hi Ti,

Here are some questions of the DRV2605.

1.In http://www.ti.com/tool/DRV2604-2605_DETN_TOOL#2 .What's is the "Vavg_abs" for could you explain more about it?

2.According to the drv2605 datasheet,input voltage should be restricted up to VDD + 0.3. What if there is I2C signal(2.1V) sending to the chip before supplying the VDD ? Will it has damage concern? 

3.Regarding to the previous question.If it will has damage concern, I found that drv2625 restrict input voltage up to 6V, so that we replace to drv2625 could avoid the damage concern?

I'm look forward to your reply.

Best Regards,

Scott

  • 0
    TI__Guru* 84915 points

    Hi, Scott,

    Please take a look at my responses below and let me know if you have additional questions or comments.

    1.In http://www.ti.com/tool/DRV2604-2605_DETN_TOOL#2 .What's is the "Vavg_abs" for could you explain more about it?

    This Vavg_abs value refers to a part of the calculation of the RATED_VOLTAGE. In section "7.5.2.1 Rated Voltage Programming" of datasheet ( http://www.ti.com/lit/ds/symlink/drv2605.pdf#page=22 ), you may see the formula 3. The Vavg_abs value is the result of (20.71x10e-3) x RATED_VOLTAGE[7:0].

    2.According to the drv2605 datasheet,input voltage should be restricted up to VDD + 0.3. What if there is I2C signal(2.1V) sending to the chip before supplying the VDD ? Will it has damage concern? 

    As you correctly mentioned, the I2C pins are limited to VDD + 0.3V level. Exposing these pins to this level could cause a damage after some time. So, we don't recommend to apply an I2C signal until VDD is applied.

    3.Regarding to the previous question.If it will has damage concern, I found that drv2625 restrict input voltage up to 6V, so that we replace to drv2625 could avoid the damage concern?

    You are right. DRV2625 has a different I2C architecture and its pins are allowed to support up to 6V even if VDD is not applied. This would be a good alternative to replace the DRV2605.

    Best regards,
    Luis Fernando Rodríguez S.