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BQ27441-G1: Question regarding recommended Flowchart

leinho
Expert 1230 points
Part Number: BQ27441-G1

Hello All,

I am implementing the recommended flowchart which is figure 3 of the QuickStart Guide. After some analysis, I have the following questions:

- The idea is that when QMAX and resistance profiles are updated, the host processor should store the values in non volatile memory. Then, when the configuration parameters are sent to the Gauge (fig 1), these two should be updated as well. Is this correct?

- Does it make sense that the system go from "Figure 1" to check QMAX flag? Should not it go directly to normal operation and then check if the values should be stored when the system entered/exited discharge and ITPOR != 1?

Thanks.

  • 0
    Expert 1230 points
    Additionally,

    How do I completely detect that the system has exited discharge? I get the interruption but flag CHG seems to be only set when SOC < 95 %. I am using flag DSG to detect when discharge starts and it has been working well.
  • 0 in reply to leinho
    TI__Intellectual 1735 points

    • Hi,
    • The default value for CHG be cleared is 95% in data memory
    • You can change the value "TCA clear" in the data memory to the value you want to change.

  • 0 in reply to answer
    Expert 1230 points

    Hi,

    Thanks for your help.

    The thing that I am tring to identify the source of the GPOUT interruption. They could be 3 (battery can not be removed in my system): 

    1- SOC (anytime SOC changes)

    2- Change of state (entry to a charge / discharge)

    3- Initialization Complete

    In the interrupt routine, I check if ITPOR == true to know that I am in 3. If this is not the case, I check if CHG is on, to know if it entered the charge) and I check DSC to confirm that the state is that it is discharging. If none of this is true, then I assume that the SOC has changed by 1 % (as the default delta is).

    Is this reasoning correct? I am using GPOUT to follow the recommended flowchart.