Datasheet
Current-Sense Characteristics
Coulomb-Counter Characteristics
(1) (2)
Current-Sense (Safety) Characteristics
(1)
Internal Temperature-Sensor Characteristics
(1)
bq78PL114
www.ti.com
................................................................................................................................................ SLUS850B – SEPTEMBER 2008 – REVISED APRIL 2009
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Measurement range
(1)
(bq78PL114) – 0.2 0.2 V
Measurement range
(2)
(bq78PL114S12, 3-m Ω – 0.077 0.077 V
sense resistor)
Measurement range
(2)
(bq78PL114S12, 1-m Ω – 0.1 0.1 V
and 10-m Ω sense resistors)
Input offset T
A
= 25 ° C ± 50 µ V
Offset drift T
A
= 0 ° C to 60 ° C 0.5 µ V/ ° C
Resolution (bq78PL114) 18 µ V
Resolution (bq78PL114S12, 3-m Ω sense 6.9 µ V
resistor)
Resolution (bq78PL114S12, 1-m Ω and 10-m Ω 10 µ V
sense resistors)
Full-scale error
(3)
T
A
= 25 ° C ± 0.1%
Full-scale error drift T
A
= 0 ° C to 60 ° C 50 PPM/ ° C
(1) Default range. Corresponds to ± 10 A using a 5-m Ω sense resistor.
(2) The bq78PL114S12 firmware upgrade supports three sense-resistor options, 10 m Ω , 3 m Ω , and 1 m Ω .
(3) After calibration. Accuracy is dependent on system calibration and temperature coefficient of sense resistor.
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Resolution 5 nVh
Intergral nonlinearity 0.008%
Snap-to-zero (deadband) ± 100
(3)
µ V
(1) Shares common input with current-sense section
(2) After calibration. accuracy is dependent on system calibration and temperature coefficient of sense resistor.
(3) Corresponds to 20 mA using 5-m Ω sense resistor
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Measurement range – 0.312 0.312 V
Short-circuit detection 10
Resolution mV
Overcurrent detection, charge and discharge 1.25
(1) Post calibration: Dependent on system calibration and temperature coefficient of sense resistor. Uncertainty is 1.5 LSB.
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Measurement range – 30 85 ° C
Resolution 0.1 ° C
Accuracy
(1)
– 30 ° to 85 ° ± 1 ° C
(1) After calibration
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