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BQ24195: Charging status

Janvob Technologies
Prodigy 80 points
Part Number: BQ24195
Other Parts Discussed in Thread: BQ27320, BQ27220

Hello,

I want to know about the STAT pin, I have read the datasheet of charging ic but I got only it showing high and low value while full charge and charging.

will this pin shows the charging percentage...??

if not then how can I show the charging percentage of battery..?

any suggestion for showing the charging percentage of battery..

its argent hope I will get answer..

thank you..

  • 0
    TI__Expert 8230 points
    Hello,

    The STAT pin on the bq24195 doesn't provide state of charge information for the battery. The STAT pin only provides information regarding to the state if the charger: charging in progress, charge terminated/disabled or a fault is occurring.

    In order to provide accurate state of charge, the device must know information about the cell such as its capacity, for this you can use a single-cell fuel gauge such as the bq27542.

    If a crude state of charge is desired, it is possible to have the microcontroller generate some percentages based on the cell's voltage, but this isn't recommended due to factors that affect state of charge such as the cell's internal impedance, temperature, charge/discharge rates, etc.
  • 0 in reply to Fernando Lopez
    Prodigy 80 points

    Thanks a lot for this sir..

  • 0 in reply to Fernando Lopez
    Prodigy 80 points
    hello sir,

    can I use the BQ27220 or BQ27320 IC for the same..
    which will be preferable or which you will recommend ?
    and in three of them the protection ic is common so if I'm using the BQ24195 so is there need of protection ic and that mosfet.
    please help
    thank you in advance..
  • 0 in reply to Janvob Technologies
    Prodigy 80 points
    hello sir,

    In which interface should I use the bq27542 ,HDQ or I2C.
    and if I am using I2C then is there need of HDQ pin or will I place it in flout condition.
    thank you in advance
  • 0 in reply to Janvob Technologies
    TI__Expert 8230 points

    Hello,

    The bq27542 can be used in either I2C or HDQ, I2C is more commonly used.

    The gauge uses I2C by default. There's a command to convert from I2C to HDQ, but this change is one-time only and irreversible. Some customers convert their gauges to HDQ for single-line communication (vs. 2 lines of I2C).

    HDQ is slower with the tradeoff of only using 1 line for communication. 

  • 0 in reply to Janvob Technologies
    Prodigy 80 points

    Hello sir,

    Protection ic is used in BQ27542 so If I'm using the BQ24195 so is there need of protection ic and that mosfets.

    please help

    thank you in advance..

  • 0 in reply to Janvob Technologies
    TI__Expert 8230 points

    Hello,

    The protections built-in onto the charger are secondary protections, it's still assumed a primary protection IC is used in the application.I recommend using a primary protection IC with external CHG/DSG FETs. Primary protection offers additional protection when charging Li-ion as well as faster response time when compared to secondary protection.