• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 74 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.

BQ27421-G1: connect the BIN pin with 10k thermistor

Brian Li
Expert 8855 points
Part Number: BQ27421-G1

Hi team,

My customer is looking at our BQ27421.

Could you please kindly help check if it is necessary to connect the BIN pin with 10k thermistor?

What the purpose of this 10k thermistor?

Can they use 100k thermistor?

Or can they use 10k normal resistor and connect to GND?

Thanks,

Brian

  • 0
    TI__Genius 13805 points

    Hi Brian,

    It is not directly necessary to connect a 10k Thermistor to the BIN pin based on what the functionality of that pin will be seen below, however this pin should never be directly shorted:

    If a removable pack is being used, then the BIN pin can be connected to Vss using a pull down resistor on the pack side, which is usually the 10k thermistor. This can be seen below:

    If the battery is embedded or if this pin is not used, then a 10k pull down resistor can be connected from BIN to Vss. 

    Regards,

    Anthony Baldino

  • 0 in reply to Anthony Baldino
    TI__Expert 8855 points

    Hi Anthony,

    Anthony Baldino said:
    If the battery is embedded or if this pin is not used, then a 10k pull down resistor can be connected from BIN to Vss. 

    Customer's battery is built-in and can not be removed. They also need to use this pin. 

    Do they need to pull up to VDD through a resistor?

    Thanks,

    Brian

  • 0 in reply to Brian Li
    TI__Genius 13805 points

    Hi Brian,

    The BIN pin registers battery insertion with a logic low signal. I believe that if the customers battery is built-in, they would need to use a 10k pull down resistor from BIN to Vss.

    Regards,

    Anthony Baldino