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ADC and Pulse-Compatible gauge?

Zhang Hui
Intellectual 625 points

Hello,

If instead of using gas gauge, we would also like to evaluate the possibility of using the simplest voltage-measuring method, as our application is quite particular.

Could TI recommend at least two ICs with I2C interface, suitable for voltage measurement? Could we use ADC for this purpose?

And could TI also recommend single-cell Impedance-Track gauges that could handle GSM pulses (or even higher to 3A magnitude)? No document of bq27421 mentioned the ability to handle GSM pulse and we are not really confident with it for high-pulse scenarios.

 

Hui

  • 0
    TI__Genius 14985 points

    Hi Hui,

    If you just want to measure voltage and think it will work for your application then you could even just use the ADC of a simple microcontroller like the MSP430.  However, in the flat voltage region you probably want to try achieving 1mV of accuracy, which is sometimes hard to do with an ADC or microcontroller.

    All of our fuel gauges have been used in a variety of applications including many GSM phones.  The IT algorithm is quite robust for many load profiles and GSM pulses have not caused any problems for it.  If you are referring to the maximum current limitation of the bq27421 integrated sense resistor, then you might consider bq27441 which is virtually identical except for the package and the ability to use an external sense resistor.  Or the bq27621 which requires no sense resistor for its algorithm.  I am assuming you want the lowest-cost options, or else I would recommend the bq275xx family.