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BQ24773: BQ24773 Reconfiguration problem

Rahul Surawase48
Expert 2395 points
Part Number: BQ24773

Hello TI, 
                 

                  We are using BQ24773 Battery charging IC in which we are facing some issues in system development, which is mentioned in below, 

1. When Input adapter & battery is connected to the BQ24773 and configure system by using host controller and if input adapter is disconnected but system is ON by battery power after some time we reconnect the input adapter but battery charging is not started, we expecting when input adapter is re-connected to the BQ24773 which running on battery that time it's need to start charging drain battery but it's not happen with existing system need reconfigure BQ24773 again, we don't want to reconfigure system is it possible to it ..?, what we need to ..?

2. We want to monitor battery voltage to avoid over discharge of the battery, what we need to it ..?

         Thanks in advance for your valuable support.

Thanks, 

Rahul Surawase

  • 0
    TI__Genius 11850 points

    Hi Rahul,

    1) Unplugging the adapter resets the ChargeCurrent() register to zero, so the host controller must reconfigure the BQ24773 before charging can be re-enabled.

    2) The BAT pin is used to accurately sense the battery pack voltage, as described below. The BQ24773 does not have an integrated ADC, but the host MCU can use its own ADC to monitor the voltage on the BAT pin.

    A more complete solution is to use a battery gauge, which monitors the battery's voltage, current, SoC (state of charge), and other parameters. Here is TI's battery gauge overview page to get you started:

    https://www.ti.com/power-management/battery-management/fuel-gauges/overview.html

    If you have more questions about gauges, please create a new E2E thread with the gauge part number in the title so that the gauge team can support you.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    Expert 2395 points

    Hello Angelo, 

                               Thanks for your prompt response...! 

                              Can you understand my state Angelo, there are battery is present in that state when adapter is OFF to power the load and charging IC is already configure when it previously working on adapter 

    We expecting, because we already configure charging IC and charging IC not loss power source because of battery sources is available to it, in that state  when i connected input adapter to the system it's need to start charging because it's registers are already configure  

    Thanks, 

    Rahul

  • 0 in reply to Rahul Surawase48
    Expert 2395 points

    Hello Angelo, 

                        We already verify that it's need to reconfigure when we remove the adapter but we need alternative, we don't want to configure at every power loss(Input Adapter absence), because device is portable and in our country at some places there are power loss issues(Load Shedding problem) 

    Thanks, 

    Rahul

  • 0 in reply to Rahul Surawase48
    TI__Genius 11850 points

    Hi Rahul,

    I understand your use case, but unfortunately, I don’t think there's a good way around this. Since the ChargeCurrent() register is reset to zero when the adapter is unplugged, the host MCU should detect each adapter plug-in and then configure the registers before charging can be re-enabled.

    The reasoning behind resetting the registers after removing the adapter is that the next adapter to be plugged in may be a different adapter with a different current rating. The previous register settings may not be valid if the next adapter to be plugged in has a lower rating than the previous adapter.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    Expert 2395 points

    Hello Angelo, 

                                 Ohk, there is any provision to hardcore this Configuration parameter ..? Means no need to configure every time and required configuration in charging IC like default setting. If yes, please guide how we can do this.

              

    Thanks in advance in your prompt reply....! 

    Thanks,

    Rahul

  • 0 in reply to Rahul Surawase48
    TI__Genius 11850 points

    Hi Rahul,

    Unfortunately, I don't think there's a way to hardcode around this on the BQ24773. The ChargeCurrent() register is reset to zero when the adapter is unplugged, so the registers must be re-configured before charging can be re-enabled.

    Here are 2 options:

    1) Have your host MCU detect the adapter plug-in and then configure the BQ24773's registers.

    2) Use a different charger IC that will charge the battery by default after the adapter is re-inserted. A standalone charger could be a good fit here since no host programming is required at all. You can set parameters such as the charge current by choosing appropriate resistor values.

    Best regards,

    Angelo