• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 581 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

BQ25120A: How to understand TS FAULT when V (HOT) < V (TS) < V (WARM)

user4225465
Prodigy 50 points
Part Number: BQ25120A

There is a TS fault when V (HOT) < V (TS) < V (WARM), the battery regulation voltage is reduced by 140 mV (minimum V BATREG under this condition is 3.6V).

How to understand this FAULT?

Is it need the i2c master to disable the charger when this fault?

There is a requirment:

From 0 to 15 degrees ,the charger current should be 10mA

From 15 to 45degrees ,the charger current should be 60mA

From our understand ,we have two ways to do this:

1:Set COLD to 0 degrees and HOT to 45 degrees.
So when TS FAULT = 0b 10, does that mean the temperature is 0 to 10 degrees?
The charging current at this time is half of the fast charging current?

If TS FAULT = 0b 11, does that mean the temperature is 30 to 45 degrees?
What is the charging current at this time? Still the fast charging current ?

2:Set COLD to 0 degrees and HOT to 60 degrees.

If TS FAULT = 0b 11, does that mean the temperature is 45 to 60 degrees?
What is the charging current if the software of i2c master is not involved?

If the MCU turns off the charging via I2C control BQ25120A when TS FAULT = 0b 11, does it mean that the charging stops at 45 degrees, which is just what the customer needs

Is the above understanding correct and suggest which option we should choose?

Many thanks

Wayne

  • 0
    TI__Mastermind 21590 points

    Hello,

    1) When the TS Warm fault occurs, the charger automatically reduces the battery regulation voltage by 140mV. You don't need to disable charge through I2C when the fault occurs.

    2) For the cool threshold, since the charge current is set to half, you can set the charge current to 20mA when this fault occurs. The actual charge current will be 10mA.

    3) For the warm fault, the charge current isnt changed so you can just set the charge current to 60mA.

    MCU can disable charging when TS is in warm if this is a system requirement.