(

)

(

)

TH

TC

TC

TH

T2

5 x R

x R

R

=

2 x R

-

7 x R

(

)

(

)

(

)

TH

TC

TC

TH

T1

5 x R

x R

R

=

3 x

R

- R

ChargeSuspend

Normal Temperature Range

ChargeSuspend

V(TS2)

V(TS1)

VSS

VCC

bq24010, bq24012

bq24013, bq24014, bq24018

SLUS530K – SEPTEMBER 2002 – REVISED JANUARY 2014

www.ti.com

TEMPERATURE QUALIFICATION

NOTE

The temperature qualifications apply only to versions with temperature sense input (TS)

pin option (bq24020 and bq24014).

Versions of the bqTINY with the TS pin option, continuously monitor battery temperature by measuring the

voltage between the TS and VSS pins. A negative temperature coefficient thermistor (NTC) and an external

voltage divider typically develops this voltage (see Figure 3). The bqTINY compare this voltage against the

charge. The bqTINY suspends charge by turning off the power FET and holding the timer value (i.e. timers are

NOT reset). Charge resumes when the temperature returns to the typical range.

Figure 6. TS Pin Thresholds

(1)

(2)

specified by the thermistor manufacturer.

10

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