• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 579 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Current Taper Threshold in bq2060

Christopher
Prodigy 240 points
Other Parts Discussed in Thread: BQ2060

How is the value for Current Taper Threshold at EEPROM location 0x4e set?  The value and units aren’t well documented in the datasheet. 

How does the programmed value 0x12 convert to 200 mA?

Is the value fixed or does the gas gauge update it?  I looked at a few packs and the value varies.

I’m working with my customer to investigate a compatibility issue with a newer gas gauge.  I’m trying to figure out how their legacy design using a bq2060 gauge worked.

  • 0
    Intellectual 765 points

    Hi! Try use this formula (see attach)

  • 0 in reply to jury noname
    Prodigy 240 points

    Thanks!

    They don't include a schematic, so the sense resistor value is unknown.  30mohms makes the formula work out for the numbers in the table above.

    Seems like the value should be fixed, but I looked at a few packs and the value varies.  Does the gas gauge update it?

  • 0 in reply to Christopher
    Intellectual 765 points

    >They don't include a schematic, so the sense resistor value is unknown. 30mohms makes the formula work out for the numbers in the table above.

    why? for example from datasheet for bq2060:

    Taper = (Rs x I) / 0.5025

    I = (Taper x 0.5025) / Rs - you Rs=0.03 Ohm, Taper (from datasheet) 0x12 = 18 (dec). You taper current I=300mA

    >Seems like the value should be fixed, but I looked at a few packs and the value varies. Does the gas gauge update it?

    I don't know for LioN chemistry. For bq2060 in my homemade ARM system I use NiMH accums and value in #4e and #4f fixed all time..