Li-ion Charger, TI BQ2057C, disabling temp sensor?

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Hi All

I would like to use the BQ2057C Li-ion charger. Its nice thats its a SOIC package so its easy to solder, and use a external mosfet so i can get a good 1A with no trouble.

Most IC for Li-ion let you disable the temp sensor using a 10K pull down resistor.

I require to disable the temp sensor as my Li-ion cells do not have a connection for this as it down with a protection PCB which is packaged with the cell.

Now according to the datasheet
http://focus.ti.com/lit/ds/symlink/bq2057c.pdf

It says it can be disabled and would work for only one temperture , hot or cold. So what would be hot and what would be cold?

It says
Applying a voltage between
the V(TS1) and V(TS2) thresholds to pin TS disables the temperature-sensing feature.

So do i still use the voltage devider circuit? Or can i just use one resistor and then use the formulas to determin the value.

I would greatfull if someone could tell me what is hot and cold, so i can choose the right values.

If only one resistor is required and that being the connected to gnd, which formula do we use as there is NTC and PTC.

best regards

DJ

Thanks

Regards

DJ

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Total votes: 0

Quote:
temperature sense input
Input for an external battery-temperature monitoring circuit. Connecting this input to VCC/2 disables this feature.

So use 2 equal value resistors. 100k each should probably do the job.

VCC----\/\100k/\/----(TS PIN)-----\/\100k/\/----GND

oddbudman