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BQ28Z610 Temperature and Charging Current Variation Clarification

Other Parts Discussed in Thread: BQ28Z610

Hello,


I was analyzing the visual representation in section 4.2 in the technical reference manual, which shows the different temperature ranges, and I am confused as to the meaning of the various currents for each temperature level. For example, the Low Temp Charging has Current Low, Current Med, and Current High. This is also the same for Standard, Recommended, and High Temperature levels. It makes sense that the current should be adjusted depending on how hot or cold the environment is based on the application, but I don't understand why there exists three different currents for the same temperature rating.

Also, in section 4.2, the TRM states, "The charging algorithm adjusts ChargingCurrent() and ChargingVoltage() according to the temperature range." Now, I know that the gauge is not capable of regulating the current delivered from the charger. It is only capable of turning the FETs on or off. So, my thought was, what was meant by that statement was that the gauge possibly adjusts current protection thresholds as a function of the measured temperature. This seemed contradictory to me since there is already other parameters such as OCC, OCD, OTC, and OTD. Anyways, that was my thought process, and I was wondering if someone could provide insight on the temperature and current levels.

Thank you for your time.

Blake

  • As an addendum to my original post, I came across this in the datasheet for the BQ28Z610.

    After coming across this, I now understand the intended use of the temperature sub ranges. My original question is in regards to what seems like redundant temperature protection thresholds. If the OTC and OTD parameters act as max temperature protections, then do the temperature sub-range thresholds also act as redundant protection to an extent?