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bq78412 Automotive Application

chaitanyab
Intellectual 620 points
Other Parts Discussed in Thread: BQ78412

Hi,

Can we use the BQ78412 Lead Acid SOC IC for Automobiles batteries?

I am designing a Automotive Logging system I need to do the SOC of the Battery.

It has 200A Cranking current.It is there for small amount of time.

Is the IC fast enough to track this change in current and the dynamic range?

 

The UART is it common one? I mean if  I just level convert it,will I be able to communicate with the chip using PC?Some NRZ encoding is mentioned in the datasheet !

 

Please give me your expert opinions.

 

-Chaitanya

  • 0
    TI__Prodigy 60 points

    The BQ78412 is not suited for an automotive application. The ADC does not sample fast enough to track the cranking current. Also, the 0.1A resolution may not be good enough in the application.

    The UART is the common one, & when level shifted, can directly be hooked on to a PC COM port.

  • 0 in reply to Abhijit Patki
    Intellectual 620 points

    Hi Abhijit,

     

    Thanks after a long long time some body from TI is talking about this...

    Now during this time I have made the board.Starting the testing from next week.

    Pls tell me what is the sampling rate ? and it may not detect cranking but what about loads like light and audio players etc.

    In your opinion what will be the cranking accuracy or incase inaccurate measurement how much will be the SOC accuracy?

    I don't need too accurate measurement ,I need gross estimate.I don't wanted the host DSP  to be loaded with this task also, so  I have made a seperate board and planning to connect it via UART to DSP.

    I think the board needs to be on the same temperature as of battery.

    I am having a ground doubt also.. for example my uCs ground(UART connector GND) should be common to battery ground or after Shunt ?

    Especially when the uC is running from the same vehicle battery?

    Hope you will be there to support for this chip...

     

    -Chaitanya

     

     

     

  • 0 in reply to chaitanyab
    TI__Prodigy 60 points

    Chaitanya,

    If you can provide your contact info, we can try to provide applications support to you directly.

    Thanks,

    Abhijit

  • 0 in reply to Abhijit Patki
    Prodigy 20 points

    I stumbled upon this thread and have questions about the BQ78412.  Please contact me at 513-367-3481.  Les Rogers

  • 0 in reply to Abhijit Patki
    Intellectual 620 points

    Hi,

     

    My mobile no is 09422500951. I am in Pune india.

     

    Regards,

     

    Chaitanya

  • 0 in reply to chaitanyab
    Prodigy 20 points

    please send me your email address.  I'd like to send you my questions and then maybe we can setup a phone call to discuss our needs and how your bq product may fit into our designs.

    lrogers@waynewatersystems.com

    Les