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BQ25150: BQ25150 CHARGE CONTROLLER

suraj nagulamalyala
Prodigy 130 points
Part Number: BQ25150
Other Parts Discussed in Thread: BQ27426

Hi Team,

Am currently working on BQ25150 charge controller,i have a query regarding charge controller,

1.What are the registers need to be configured ,to switch the voltage from charge controller to fuel Guage (BQ27426)using BAT pins and without using any battery as input supply to Guage

2.FYI we are using CE pin to enabling charging for controller and it is kept floating,it means default it is enabled for charging mode in our target board.

3.What is the key functionality of LDO,MR and PMID pins,is there any need to configure these pins for enabling BAT pins

4.Could you explain me the main functionality of those pins apart from datasheet and to get input supply voltage for fuel Guage

Thanks in advance

suraj.N

  • 0
    TI__Mastermind 23410 points

    Hi Suraj,

    suraj nagulamalyala said:
    What are the registers need to be configured ,to switch the voltage from charge controller to fuel Guage (BQ27426)using BAT pins and without using any battery as input supply to Guage

    Can you expand more on this? As far as I'm aware, there is no means of changing the connection of the battery from the BQ25150 to BQ27426 only with the battery charger.

    suraj nagulamalyala said:
    FYI we are using CE pin to enabling charging for controller and it is kept floating,it means default it is enabled for charging mode in our target board.

    This is fine.

    suraj nagulamalyala said:
    What is the key functionality of LDO,MR and PMID pins,is there any need to configure these pins for enabling BAT pins

    suraj nagulamalyala said:
    Could you explain me the main functionality of those pins apart from datasheet and to get input supply voltage for fuel Guage

    The LDO pin is a load switch or LDO that can support a load < 150mA. It can be configured for a voltage in 100mV steps in the LDOCTRL register. It is used as a power rail for other components that may need a different voltage from PMID.

    The /MR pin is a manual reset pin. It can be used to reset the device or to wake the device up from ship mode. This will take a manual user input through components such as a button.

    The PMID pin is the main power rail for powering a system. It is a voltage output. 

  • 0 in reply to Anthony P Pham
    Prodigy 130 points

    HI Anthony P Pham

    Can you expand more on this? As far as I'm aware, there is no means of changing the connection of the battery from the BQ25150 to BQ27426 only with the battery charger.

    1.I want to switch the voltage from Charge controller(BQ25150),VBUS voltage To FUEL GUAGE (bq27426)by using BAT pins,as my guage is not connected to any input supply voltage,so i need to wake-up guage from idle mode using My charge controller(BQ25150), Is it possible or not...

    2.if you have any sample code regarding BQ25150 can you provide me,

    thanks in advance

    suraj.n

  • 0 in reply to suraj nagulamalyala
    TI__Mastermind 19195 points

    Hi Suraj,

    Do you have a schematic we can review.

    Thanks,

  • 0 in reply to Nick Brylski
    Prodigy 130 points

    Hi Nick Brylski,

    Here is the schematic of charge controller and fuel guage,am getting 5v input at PMID_EAR,i want to switch the voltage from controller to fuel guage through BAT pins,as mentioned in datasheet,

    so that i can get 3.5v to 3.7 at R29, and C39 terminals to drive the IC BQ27426 FUEL GUAGE,

    what are the registers need to be configured in order to get the voltage....??

    Thannks inadvance

    suraj.N

  • 0 in reply to suraj nagulamalyala
    TI__Mastermind 23410 points

    Hi Suraj,

    Do you have a battery connected to the BQ27426? The BQ25150 if configured correctly, will charge the battery.  may be able to comment on the operation of the BQ27426 but I see no issues with the BQ25150 in terms of schematic.

    For any code, we recommend starting at the BQ25150 Setup Guide. This can generate code that can be run at startup and give an examples for writing the I2C commands to configure the device.