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BQ24195LEVM - FAST CHARGE CURRENT AT LOW TEMP

Ben Cotton
Prodigy 70 points
Other Parts Discussed in Thread: BQ24195L, BQ24193

The datasheet for BQ24195L (Revised December 2014)  shows Bit 0 of REG05 (Charge Termination/Timer Control) as being reserved.

The GUI software (v1.5.0.1 along with the USB to I2C/GPIO dongle) for the EVM shows Bit 0 for this register as "Fast Charge Current at Low Temp" with a 0 being 50% and a 1 being 20%.

If the GUI is correct, is the "low" temperature related to thermistor "cold" temperature?

I am using a battery that I can charge at lower temperatures at 20% of normal charge and trying to figure out how if I can utilise this function to reduce the charge if the battery drops to a specific temperature.

Thanks

  • 0
    TI__Expert 8230 points

    Hello Ben,

    The GUI used for the bq24195L also supports the rest of the 19x family as well, so you will notice the GUI mentions functions that may be present on other members of the 19x family.

    In the case of the 195L, this device supports 50% fast charge current at low temp by default, also why the datasheet specifies to keep this bit 0. If you are interested in using this feature to specify 20% fast charge current at low temp, I recommend reviewing the bq24193 instead.

  • 0 in reply to Fernando Lopez
    Prodigy 70 points
    Fernando,

    Many thanks for the useful and informative answer.

    I did just look at the one you suggested and it indicates that this value operates between 0 and 10 deg C.

    The Lithium Batteries that I am using can be charged at 100mA all the way down to -20 deg C and then between -20 deg C and -40 deg C the charge needs to be reduced to 20mA.

    I could not find a TI battery charger IC that encompassed this along with battery charge at 4.2V, depletion voltage at 2.4V and the battery path also able to handle the 2 Amp spike of a GSM application.