TS function for IEC 62368 BQ24040

Nir Porat

Hey there ,

I would like to understand few issues related to the new standard IEC 62368 --> there is a requirement to shut down battery charging if temperature is out of the spec defined by the battery manufacturer.

I understand this should be done by adding 10K NTC to TX pin and to ground, for case one.

1. how to define the right resistance for temp range of 0-50 deg?,

2. If i don't need this feature , does the pin MUST be connected to 10K resistor pulled to ground or can remain floating?

Data sheet is not clear for this issue

over 6 years ago

0 Bill Johns over 6 years ago

TI__Guru* 75656 points

Hello
We are addressing this question with you thru email currently.

0 Bill Johns over 6 years ago in reply to Bill Johns

TI__Guru* 75656 points

Hello

Following info sent by email.

"I understand this should be done by adding 10K NTC to TX pin and to ground, for case one."

1. how to define the right resistance for temp range of 0-50 deg?,

Bill J -- The TS pin current source is 50uA and Cold Temp trip point is 1230mV, Hot Temp Trip point is 178mV. This sets the NTC resistance Cold at 25k ohm and Hot at 3.6k ohm.

2. If i don't need this feature , does the pin MUST be connected to 10K resistor pulled to ground or can remain floating?

Bill J – If NTC temp sensing is not used then I recommend connecting a 10k resistor to TS pin.

0 Nir Porat over 6 years ago in reply to Bill Johns

Intellectual 590 points

Not sure i understand

Recommended means it is not mandatory needed?

What is the risk?

The data sheet indicate once for floating and once for resistor required which one is correct ?..

What is the NTC value i need in order to use temp range of 0 - 45 deg?

Can i get PN for reference ?

0 Bill Johns over 6 years ago in reply to Nir Porat

TI__Guru* 75656 points

Thanks for the call today.
Info you were looking for has been emailed.

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TS function for IEC 62368 BQ24040