DRV2605L: Looses I2C communication constantly, cannot be reached

Kevin Parker

Part Number: DRV2605L

Tool/software:

Hello,

We're going through EVT on our boards, and notice that the DRV constantly looses i2c communication for some reason after a few hours. We have about 10 devices on the bus in total, and it's always the DRV that losses communication. We have no trace to hard reset it, and it's powered by a 3.3v regulator. It never returns until a hard reset.

I found this related thread that was never resolved:

https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1174173/drv2605l-i2c-comunication-failure/4507887?tisearch=e2e-sitesearch&keymatch=DRV2605L#4507887

9 months ago

0 Hailong Chen 9 months ago

TI__Expert 3560 points

Thanks for reaching out. Let me work with the team and dig into this.

0 Kevin Parker 9 months ago in reply to Hailong Chen

Prodigy 40 points

Thanks there was also this but no real mention of any solution. We increased the caps while we wait for a real solution to 10uF. But in all honesty our MCU has brownout detect set at 2.8v on the same bus, so we're surprised that's the issue as the DRV is rated for 2.0v - 5.5v operation, and we're going with the recommended design from the data sheet.

e2e.ti.com/.../drv2605l-i2c-communication-stuck

0 Hailong Chen 9 months ago in reply to Kevin Parker

TI__Expert 3560 points

Kevin, we discussed internally and the only cases we know of are: sudden drop in supply voltage (brownout) or slow power up (need >3.6kV/s ramp up). Review in section 8.3.12.4. Could you double check if this is your case?

0 Kevin Parker 8 months ago in reply to Hailong Chen

Prodigy 40 points

Thanks Hailong, I'll take a look and report back

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DRV2605L: Looses I2C communication constantly, cannot be reached