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EV2400: clock sequence difference between EV2400 and EV2300

John Chou62
Intellectual 2070 points
Part Number: EV2400
Other Parts Discussed in Thread: BQ40Z50, BQSTUDIO,

Tool/software:

Customer using the bq40z50 gauge IC and bqStudio to send the same command "FW version" read

it's found that EV2400 and EV2300 clk waveform will have the following difference

EV2400: M430F5529 REV K

on the left side is the zoomed in clk sequence, and on the right side is the entire transaction for reading the "fw_version" using bqStudio command tab

customer comment that the EV2300 is more commonly observed for the address/command sequence of the clk 

but EV2400 has the continuous clk wave form shown below.

customer would like to check what might be causing this difference between the EV2400 and EV2300.    Thanks for the support

  • 0
    TI__Mastermind 28480 points

    Hi John,

    Based on the images above, it seems like there could be differences in how they both process Clock Stretching. Is the correct value able to be read from the device in both of these situations at this time?

    Regards,

    Anthony

  • 0 in reply to Anthony
    TI__Intellectual 2070 points

    yes, both EV2300 and EV2400 can read the FW version information fine and work with bqStudio functions 

    customer is curious on the EV2400 clock design difference to the EV2300. 

    as they are more customed to see the EV2300 clk waveform in the field.  

    please help on checking the difference? thanks 

  • 0 in reply to John Chou62
    TI__Mastermind 28480 points

    Hi John,

    These two devices use two different controller ICs that handle the communication and clock stretching, which is most likely where the difference comes from. The EV2400 uses the MSP430 while the EV2300 uses the TUSB3210PM as its host.

    Regards,
    Anthony