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BQ34Z100-G1: Golden image file

SHIVA MADISHETTY
Prodigy 125 points
Part Number: BQ34Z100-G1

Hi,

Once we have the golden image file and program it to a new gas gauge device and connect the battery the very first time, would the gas gauge know the SoC accurately  immediately?

also, For example, if the battery or fuse is replaced, does gas gauge has to go through any waiting period to learn the battery characteristics or it will provide reliable data of the battery as soon as new battery is connected?

Please clarify.

Thank you.

  • 0
    TI__Guru 61536 points

    The gauge will take a current/voltage/temperature measurement and will perform a reverse lookup in its internal chemistry model of the gauge to determine cell depth of discharge. SOC is then calculated via a capacity simulation based on the load mode/select and parameters from your golden image.

    If the cell is a good match for the golden image (i.e. a new cell similar to the one that was used to create the golden image with a the load prediction compatible for your system), the temperature is within 0C to 50C, the current is below C/50 (or a true OCV) and the depth of discharge is so that the OCV isn't in the flat zone, then the SOC will be accurate. If any of these conditions are not met, then SOC can become fairly inaccurate but this will improve as the gauge adapts to the cell and system over time.

  • 0 in reply to Dominik Hartl11
    Prodigy 125 points

    Thank you. 

    One more question, why should we change the 'Update Status' from 06 to 02 (disabling IT Enable bit) after learning cycle, whats the reason behind this?

    Th device reference manual says, Update Status being 02 is standard setting for golden image file and 06 is operation setting for the end equipment.

    Can you please explain this? does this IT Enable bit get set automatically by the device during operation, when exactly?

  • 0 in reply to SHIVA MADISHETTY
    TI__Guru 52115 points

    It is optional to change the 'Update Status' from 06 to 02.