LTC4012 datasheet(4/18 Pages) AD

4 / 18 page

LTC2959

Rev. 0

For more information www.analog.com

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: Average current flowing into the VDD pin. The coulomb counter

supply current is a function of the voltage between its inputs. The ADC

supply current depends on the channel that is being measured. During

ADC conversions that measure the voltage on VSENSEN (ADC voltage mode

and register B[2] to ‘1’), current flows into SENSEN. Typically, during such

conversions, ISENSEN = VSENSEN/400kΩ.

Note 4: The coulomb counter measures static signals as well as dynamic

inputs (current pulses). It may take several short pulses to increment/

decrement the ACR.

Note 5: The equivalent charge of an LSB in the accumulated charge

Note 7: CB = Capacitance of one bus line in pF (10pF ≤ CB ≤ 400pF).

Note 8: Guaranteed by design, not subject to test.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

I2C Timing Characteristics

fSCL(MAX)

Maximum SCL Clock Frequency

400

900

kHz

tBUF(MIN)

Bus Free Time Between STOP/START

1.3

µs

tSU,STA(MIN) Minimum Repeated START Set-Up

Time

600

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

START Condition

600

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

Condition

600

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

100

tHD,DATI(MIN) Minimum Data Hold Time Input

tHD,DATO

Data Hold Time Output

0.3

0.9

µs

tOF

Data Output Fall Time

(Notes 7,8)

20 + 0.1 • CB

300

Timeout

Max Time between Last SCL Clock

Edge and SDA Release

51.2

The l denotes the specifications which apply over the full operating

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

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