BQ2022A: BQ2022A SDQ bounces after tRSTRB is inserted

Wei-Hao Chen (TW-FAE)

Part Number: BQ2022A

Hi team,

My customer is using BQ2022A and they have encountered an issue when reading the data from the BQ2022A.

When the DATA is '0', the VPU always bounces to high level for a short duration and return to low level after t_RSTRBis inserted. Please see the waveform below:

t_RSTRBis around 8us. And we saw the VPU has bounced to VCC level and stay high for around 8us.

Is it possible during the transition region (as marked below) the V_PU bounces to high level and return to low when the correct data is '0'?

Please help us to clarify what might caused this issue.

Many thanks!

over 7 years ago

0 Onyx Ahiakwo over 7 years ago

TI__Guru* 76230 points

Hi Wei,
Does your customer see this issue on the EVM? If they don't can they check the vaules of the comm line components to see that it matches that of the EVM?

thanks
Onyx

0 Wei-Hao Chen (TW-FAE) over 7 years ago in reply to Onyx Ahiakwo

TI__Expert 3260 points

Hi Onyx,

Thanks for your reply. My customer is using 1.5kohm for the pull-up resistor, is this the problem? I have already suggested the customer to increase the pull-up resistor to 5kohm, and still waiting for the customer test result.

Thanks a lot.

Best Regards,
Wei-Hao Chen

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BQ2022A: BQ2022A SDQ bounces after tRSTRB is inserted