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Original question:

[FAQ] BQ24040 and BQ2404X family TS pin configuration of NTC and TTDM mode

BQ24050 TS connection

user4223274
Prodigy 10 points
Other Parts Discussed in Thread: BQ24050

Hi,

I am designing a new circuit based on BQ24050 Texas Instruments Li-Po Charger. The battery that the system uses doesn´t have NTC, it only has two pins (+ and -). My question is, How should I connect the TS pin?

Based on this post e2e.ti.com/.../762756 and that the battery will be permanently connected. I think that my options are:

1. Connect TS to GND with 10k resistor

OR

2. Connect TS to GND with 237K

OR

3. Use an external NTC (i don´t like this idea)

Also, I am not sure if I should connect the TS to the host microcontroller to command the IC charger because my battery doesn´t have NTC.

Best regards,

Carlos

 

  • 0
    TI__Guru 67866 points

    Hi Carlos

    The 10k resistor TS to ground would be the easiest solution.  But this provides no thermal limitation during charging and does this meet your design / safety requirements.

    The 237k resistor is not needed, only good if the battery will be removed.

    Add NTC to PCB will provided some thermal limitation, prevent charging too cold or too hot. 

    Connecting TS to micro GPIO is not a bad idea, it gives you some options to disable charging.  The TS current is 50uA, very low caution with load during normal operation.  Pull low to stop charge.

    .