Current-Sense (Safety) Characteristics

(1)

Internal Temperature-Sensor Characteristics

(1)

External Temperature-Sensor(s) Typical Characteristics

(1)

SMBus Characteristics

(1)

bq78PL114

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 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

–30° to 85°

±1

°C

(1)

After calibration.

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

–40

90

°C

Resolution

0.2

°C

25°

±1

°C

0° to 85°

±2

(1)

Typical for dual diode (MMBD4148 or equivalent) external sensor using recommended circuit.

(2)

Range of diode sensors may exceed operational limits of IC and battery cells.

(3)

Typical behavior after calibration, final result dependent on specific component characteristics.

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input low voltage

0

0.8

V

Input high voltage

2.1

5.5

V

Output low voltage

350-

µA sink current

0

0.4

V

Capacitance, each I/O pin

10

pF

SCLK nominal clock frequency

100

kHz

13.3

45.3

(2)

Pullup resistors for SCLK, SDATA

k

Ω

2.4

6.8

(1)

SMBus timing and signals meet the SMBus 2.0 specification requirements under normal operating conditions. All signals are measured

with respect to PACK-negative.

(2)

Pullups are typically implemented external to battery pack, and are selected to meet SMBus requirements.

8

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