• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 65 subscribers
  • Views 523 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.

BQ24045: Problem about PACK NTC

wolfking
Prodigy 10 points
Part Number: BQ24045
Other Parts Discussed in Thread: BQ24074

Battery charger chipset BQ24045 , about NTC , 45~60°C, still charging , only VBAT_REG change to 4.1V. But  all the battery datasheet in my hand have the same charging area : 0~45°C.

So, is there any method to cancel the detect in 45~60°C ?  I hope that if  battery temp above 45°C, the charging will be pending.Battery GRP652348-3.8V-850mAh datasheet .pdfBattery charger TI bq2404x.pdf

  • 0
    TI__Guru 71416 points
    Hello
    The bq24045 battery pack NTC monitor (TS Pin) circuit is current based, 50uA current to NTC. The hot and cold temp window are fixed at 1.230V (cold) and 0.178V (hot). External resistors can be used to adjust the trip points to match your requirements. A similar circuit is used in the bq24074 and equation 9 in the data sheet can be used for calculations of the window, NTC current and hot / cold window for 24045 can be plugged in.
  • 0 in reply to Bill Johns
    Prodigy 10 points

    The bq24045 battery pack NTC monitor (TS Pin) circuit is current based, 50uA current to NTC,you konw.SO 0℃: Rts=24.6KΩ ; 10℃:Rts=15.8KΩ ; 45℃: Rts=5.56KΩ；60℃：Rts=3.56KΩ.However the thermistors' （SEMITEC 103AT-2 or Mitsubishi TH05-3H103F suggested in spec.）β is not 3370 but 3435，and their values are difference from above at 60°C, 45°C, 10°C, and 0°C. Why?