LTC2941C(RevA) Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LTC2941C
(Rev.:RevA)

Battery Gas Gauge with I2C Interface

Linear Technology 

LTC2941

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 2)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

VBAT Alert VBAT Alert Threshold

Digital Inputs and Digital Outputs

VSENSE+ Falling, B[7:6] = 01

VSENSE+ Falling, B[7:6] = 10

VSENSE+ Falling, B[7:6] = 11

l 2.75

2.8

2.85

V

l 2.85

2.9

2.95

V

l 2.95

3

3.05

V

VITH

Logic Input Threshold, AL/CC, SCL,

SDA

VOL

Low Level Output Voltage, AL/CC, SDA

IIN

Input Leakage, AL/CC, SCL, SDA

CIN

Input Capacitance, AL/CC, SCL, SDA

tPCC

Minimum Charge Complete (CC) Pulse

Width

I2C Timing Characteristics

I = 3mA

VIN = VSENSE+/2

(Note 7)

l 0.3 •

VSENSE+

l

l

l

0.7 •

V

VSENSE+

0.4

V

1

µA

10

pF

1

µs

fSCL(MAX)

tBUF(MIN)

tSU,STA(MIN)

Maximum SCL Clock Frequency

Bus Free Time Between STOP/START

Minimum Repeated START Set-Up

Time

l 400

900

kHz

l

1.3

µs

l

600

ns

tHD,STA(MIN) Minimum Hold Time (Repeated)

START Condition

l

600

ns

tSU,STO(MIN) Minimum Set-Up Time for STOP

Condition

l

600

ns

tSU,DAT(MIN) Minimum Data Set-Up Time Input

tHD,DATI(MIN) Minimum Data Hold Time Input

tHD,DATO Data Hold Time Output

tOf

Data Output Fall Time

(Notes 6, 7)

l

l

l

0.3

l 20 + 0.1

• CB

100

ns

0

µs

0.9

µs

300

ns

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All currents into pins are positive, all voltages are referenced to

GND unless otherwise specified

Note 3: ISUPPLY = ISENSE+ + ISENSE–

Note 4: The equivalent charge of an LSB in the accumulated charge

registers (C, D) depends on the value of RSENSE and the setting of the

internal prescaling factor M. It is calculated by:

qLSB

= 0.085mAh • 50mΩ

RSENSE

•M

128

See Choosing RSENSE and Coulomb Counter Prescaler M section for more

information.

1mAh = 3.6A • s = 3.6C (coulomb), 0.085mAh = 306mC.

Note 5: Deviation of qLSB from its nominal value.

Note 6: CB = capacitance of one bus line in pF (10pF ≤ CB ≤ 400pF).

Note 7: Guaranteed by design, not subject to test.

2941fa

3

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