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BQ24770: bq24770

vikas rastogi
Prodigy 100 points
Part Number: BQ24770

hello,

   i am using the BQ24770 for controlling the charging of battery. i am writing the registers given in the ic. but this ic is not providing the voltage and current what i want.  please help me with this. how to start this ic. is there and bit in any register to make it on. i programmed it for high performance mode by writing 0 to the 15 bit of charge option 0 register.

  • 0
    TI__Mastermind 20240 points

    The bq24770 uses SMBus communication. Please follow the EVM user guide in the link below for testing.

    http://www.ti.com/lit/ug/sluuao3c/sluuao3c.pdf 

  • 0 in reply to Jing Zou
    Prodigy 100 points

    thanks Jing Zou for answering. but i not using any evolution board of bq24770 so I am not using the software tool provided for this. the ACDRV PIN is not becoming high on my pcb when i connect the charger and battery so ACFET is not ON. is there any bit in the given registers to make this pin high . please provide me the solution for this..

  • 0 in reply to vikas rastogi
    TI__Mastermind 20240 points

    Can you please share your schematic? 

    Please also share scope capture on the issue. Probe ACOK, ACDET, ACDRV, and VCC.

    Make sure the below conditions are met.

    • V(UVLO) < V(VCC) < V(ACOVP)
    • V(ACDET) > 2.4 V
    • V(VCC) – V(SRN) > V(VCC_SRN_RISE)

    Please also check the status of reg0x12[11]

  • 0 in reply to Jing Zou
    Prodigy 100 points
    this is my code i am sending lower byte then higher byte. i need 16.8 v charging voltage and 2 amp current . i put the minimum charging voltage 12.5 approx and maximum as 16.8 approx.

    bms_register_value_write(0x09 , 0x12 , 0x46, 0x69); // i sending 0x6946 to the 12 register.

    bms_voltage_value(0x09 , 0x12); // reading the 12 register and getting value what i have written.

    bms_register_value_write(0x09 , 0x14 , 0x00 , 0x08);

    bms_voltage_value(0x09 , 0x14);

    bms_register_value_write(0x09 , 0x15 , 0xa0 , 0x41);

    bms_voltage_value(0x09 , 0x15);



    bms_register_value_write(0x09 , 0x3b , 0x00 , 0x10);

    bms_voltage_value(0x09 , 0x3b);

    bms_register_value_write(0x09 , 0x3e , 0x00 , 0x24);

    bms_voltage_value(0x09 , 0x3e);

    bms_register_value_write(0x09 , 0x3f , 0x00 , 0x0c);

    bms_register_value_write(0x09 , 0x38 , 0x00 , 0x00);

    bms_voltage_value(0x09 , 0x38);

    bms_register_value_write(0x09 , 0x3c , 0x16 , 0x4b);

    bms_voltage_value(0x09 , 0x3c);

    bms_register_value_write(0x09 , 0x3d , 0x20 , 0x81);

    bms_voltage_value(0x09 , 0x3d);



    first writing then reading the value in that registers. please share the code if you have any which is working .
    not getting the charging voltage due to acdrv pin is low continuously.

    /home/vikas/Desktop/Screenshot from 2017-03-16 20-55-57.png
  • 0 in reply to vikas rastogi
    TI__Mastermind 20240 points
    Can you check the status bit in register 0x12 bit 11? This bit indicates if there is a SYSOVP fault.
    I do not see the scope capture and the schematic. Can you re-attach?
    I will need the above information to help you debug further.
  • 0 in reply to Jing Zou
    Prodigy 100 points
    Can u give me ur mail id
  • 0 in reply to vikas rastogi
    Prodigy 100 points

    11 bit of 12 register is 1....and please tell me why this ic is responding only 0x09 slave address as smbus. it is not responding on ox12 as slave address mentioned in the datasheet. please provide me the configuration of registers as my charger and battery voltage.

    battery is 14.8 volt 4 amp, charger we have of 16.8 and 5 ampere.

  • 0 in reply to vikas rastogi
    Prodigy 100 points

    provide me mail id so i will share the schamatic.

  • 0 in reply to vikas rastogi
    TI__Mastermind 20240 points

    Thanks for the schematic. We are reviewing it.

    Have you checked the below condition as i mentioned in my second post? Can you send scope capture on power up (VCC, ACDET, ACOK, VSYS)?

    Make sure the below conditions are met.

    • V(UVLO) < V(VCC) < V(ACOVP)
    • V(ACDET) > 2.4 V
    • V(VCC) – V(SRN) > V(VCC_SRN_RISE)

  • 0 in reply to Jing Zou
    TI__Mastermind 20240 points

    What is your configuration on CELL pin? If reg0x12 bit [11] is 1 then it indicates the device is in SYSOVP. 

    Please refer to datasheet page17 for CELL configuration table. When left CELL pin float, the SYSOVP threshold is set to 12V default. 

    Please refer to datasheet section 9.6 on all details of the registers description. We do not provide configuration of registers. Please read the register map section in the datasheet and set the parameters accordingly. 

  • 0 in reply to Jing Zou
    Prodigy 100 points

    Hello,

    I checked these condition ..all are fine...the bit 11 of 12 register is high..please check schematic. Is there any problem.