Q: bq20z95 commnication problem under 90Khz - SMB_CLK which compliance to smbus V1.1 between 10K - 100Khz by 1339887

Dear,

Why bq20z95(our PCM/bq20z95 EVM Board can not commnicate or failure rate higher to 97%  under 90Khz ( SMB_CLK ) with US15W ( Intel ) ?? but bq2060A communication is Okay under 90Khz ,

 and Ev2300 is Okay under low Speed 5x Khz !

*** How to Solve the commnication issue ( Assume US15W can not speed down to 50Khz ) :

1. Bq20z95 parameter setting :

   Which parameter Setting relative to  speed CONTROL  in bq20z95 ??

2. BUG FROM BQ20Z95 - it can not speed to 90khz ( not compliance to MAX 100KHZ IN SMbus SPEC ) 

     ** Internal MCU can not speed up 90khz to capture Smbus data !

Thks,

Leung

 


Q: Re: bq20z95 commnication problem under 90Khz - SMB_CLK which compliance to smbus V1.1 between 10K - 100Khz by 1489

Hi Leung,

It's not much of a Khz issue, but the wait time between package. Try have a longer wait time between package. We usual obtain pretty good robust communication using 200usec wait.