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Over-temperature protection parameters (bq20z80 + bq29312A chipset)

Scott Phillips
Intellectual 310 points
Other Parts Discussed in Thread: BQ29312A, BQ20Z80

I'm trying to figure out when the following temperature protection thresholds apply for the bq20z80 + bq29312A chipset.

Within the 1st Level Protection section (2.1) there are the following over-temperature parameters:

Over Temp Chg
OT Chg Time
OT Chg Recovery
Over Temp Dsg
OT Dsg Time
OT Dsg Recovery

Within the Charge Control section (2.4) there are the following charge inhibit and suspend parameters:

Chg Inhibit Temp Low
Chg Inhibit Temp High
Temp Hys
Suspend Low Temp
Suspend High Temp

If I am in a charge mode with high temperatures, which parameters apply - "Over Temp Chg" or "Suspend High Temp"

Currently our packs are programmed with the following charge values:

Over Temp Chg = 500
Suspend High Temp = 550

Since the "Over Temp Chg" parameter is set to a lower temperature, does this mean that the charge control parameter "Suspend High Temp" has no effect?

What is the reason for having these two sets of temperature thresholds?

Thanks for your help -

Scott

  • 0
    TI__Genius 14015 points

    Scott,

    The Over Temp Chg trigger is a protection threshold that will disable charging as well as set a flag in the Safety register. The Suspend High Temp threshold will disable charging (which will already have happened in your case) and set a different flag in the Charging register. This just allows more flexibility, since you could set the temperatures to different values. Hope this helps.

    Regards,

    Jason