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Original question:

BQ25713B: BQ25713 battery removal

BQ25713B: BQ25713 precharge current

smrutirekha puspasree
Prodigy 160 points
Part Number: BQ25713B
Other Parts Discussed in Thread: BQ25713

Hi Team ,

We are working with bq25713b ,where ,in ChargeOption0 Register,bit (2) EN_LDO i have given 1  and CHRG_INHIBIT(bit 0) I have set  0 .

so my doubt is ,if any battery we connect ,having less vol ,not dead but yeah battery vol in multimeter was showing 0v ,so if we connect this battery to charger ,so automatically from precharg to fast chrging will happen ,or we have to set the current (both precharge and fast charge in ChargeCurrent() 03/02h manually from host side) ?

Thanks,

SMRUTI

  • 0
    TI__Mastermind 18775 points

    The customer has to set the charge current register manually from the host side. When the battery voltage is below minimum system voltage, the charge current is clamped at 384mA; when the battery voltage rises above minimum system voltage (REG#0C), the charge current automatically back to the Charge Current register value, such as 3A. 

  • 0 in reply to Tiger Zhou
    Prodigy 160 points

    Hi Tiger ,

    Thanks for your reply ,it was helpfull .so currently i set 

    BQ25713_REG_CHARGE_OPTION_0                =     0X0E,0X02
    BQ25713_REG_INPUT_VOLTAGE                      =     0X80,0X1C  //10496mV is the input voltage
    BQ25713_REG_MIN_SYSTEM_VOLTAGE          =      0X00,0X19 //6400mV is the minimum system voltage
    BQ25713_REG_IIN_HOST,0X00,0X50                 =     4000mA is the input current
    BQ25713_REG_MAX_CHARGE_VOLTAGE         =      0XD0,0X20  //8400mV is the max charge voltage
    BQ25713_ADC_OPTION                                       =      0xFF,0xA0  

    BQ25713_REG_CHARGE_CURRENT                  =     0x00,0x08//2048mA current 

    we are not setting any other resistor apart from this ,

    So when we connect a fully discharged 2cell battery PROCHOT pin become low,after i remove dc power and again giving power to it ,then prochot pin become high (which is normal,i always see this pin as high  ).

    So can you tell how to handle this prochot ,pin ,Why this become high and low ?

    Thanks,

    Smruti

  • 0 in reply to smrutirekha puspasree
    TI__Mastermind 18775 points

    There are two PROCHOT OPTION registers inside the part. See datasheet for more details. 

  • 0 in reply to Tiger Zhou
    Prodigy 160 points

    Hi Tiger ,

    I am not configuring prochot register ,

    this is what i observed

    If we connect fully discharged battery ,then dc power we connected , prochot pin become high ,and it is remaining high unless we remove dc power and reconnect it back ,why this thing is happened ,any reason ? 

    But if we connect a normal (20% also charged) battery ,prochot pin become low only always .(which is in natural).

    please answer 

    Thanks,

    Smruti

  • 0 in reply to smrutirekha puspasree
    TI__Mastermind 18775 points

    In the first case, the PROCHOT is triggered (asserted low) due to adapter removal. Normally, the PROCHOT stays high, if any fault conditions, such as adapter removal, battery removal, it can triggered low if enabled. 

  • 0 in reply to Tiger Zhou
    Prodigy 160 points

    Hi Tiger ,

    You mean to say this PROCHOT PIN if we will try to read ,so in normal condition it should always give high signal ,if any fault occurs then it will give low signal .Please correct me if I am wrong ?

    Thanks,

    SMRUTI

  • 0 in reply to smrutirekha puspasree
    Prodigy 160 points

    Hi Tiger ,

    Please reply ,to the upper question .

    Thanks,

    Smruti

  • 0 in reply to smrutirekha puspasree
    TI__Mastermind 18775 points

    Hi, SMRUTI,

    You are correct. PROCHOT pin is  active low open drain output of processor hot indicator. It monitors adapter input current, battery discharge current, and system voltage. After any event in the PROCHOT profile is triggered, a pulse is asserted.