DRV2700: DRV2700 generates external interference

Hello engineer, referring to the DRV2700EVM, we designed a 3-way piezoelectric ceramic driver circuit. However, I found that after DRV2700 is enabled to work, it will interfere with some other digital signals on the board, causing significant noise signals on the digital signal level, resulting in signal recognition errors. After three DRV2700 are enabled to work simultaneously, the interference is maximum, and the interference signal disappears after all are turned off. May I ask how DRV2700 generates external interference? What should be done?

Cherry Zhou：

Hi,

We're looking into this issue and please allow some time for us to get back to you.

Thanks

,

Cherry Zhou：

Hi,

Are you seeing this noise on a pin of the DRV2700 or an external digital pin? The noise is likely coming from the boost on the DRV2700. Because of this high voltage switching signal you have to be very careful about how you route your digital signals and the high voltage signals from the boost on your layout. Otherwise the high voltage signals will couple on to your digital signals and cause the noise your are seeing. 

Thanks