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BQ27542-G1: Using BQ27542 Without temperature sense resistor

John Scott57
Intellectual 385 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: BQ35100

Hi,

I am considering using a BQ27542 in a design with a long life LiSoCl2 battery. Is it necessary to use the temperature sense resistor? Will the device function without the temperature sense resistor connected? Is there perhaps an internal thermistor I can use instead of one directly mounted on the battery if we're happy with less accuracy? 

Also is this device suitable for this battery chemistry or are there any problems I should know about? I notice that the maximum charge which the device can measure is 14.5Ah. Our battery is larger than this, is it just a matter of resetting the device after we near this capacity?

Thanks,

John. 

  • 0
    TI__Mastermind 34775 points
    Hi John,

    Lithium Thionyl Chloride (Li-SOCl2) is a primary cell. I would recommend using bq35100 for primary cell applications. bq27542-G1 is for secondary cell applications.

    To answer your temp sensor question, yes bq27542-G1 has an internal temp sensor that can be used by clearing the [TEMPS] bit in PackConfig register.

    Charge capacities are typically 16 bit registers, so should be able to handle 65535mAh values there maybe other factors that limit that as max charge and discharge currents.