LTC2941CDCB datasheet(3/16 Pages) LINER

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LTC2941

2941f

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

Digital Inputs and Digital Outputs

VITH

Logic Input Threshold, AL/CC, SCL,

SDA

0.3 •

VSENSE+

0.7 •

VSENSE+

VOL

Low Level Output Voltage, AL/CC, SDA

I = 3mA

0.4

IIN

Input Leakage, AL/CC, SCL, SDA

VIN = VSENSE+/2

1μA

CIN

Input Capacitance, AL/CC, SCL, SDA

(Note 7)

tPCC

Minimum Charge Complete (CC) Pulse

Width

1μs

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 Setup Time

600

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

Start Condition

600

tSU,STO(MIN) Minimum Setup Time for Stop

Condition

600

tSU,DAT(MIN) Minimum Data Setup Time Input

100

tHD,DATI(MIN) Minimum Data Hold Time Input

0μs

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 pre-scaling factor M. It is calculated by:

LSB = 0.085mAh •

50mΩ

SENSE

•

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.

TIMING DIAGRAM

tSU, DAT

tSU,STO

tSU,STA

tBUF

tHD,STA

tHD,DATO,

tHD,DATI

tHD,STA

START

CONDITION

STOP

CONDITION

REPEATED START

CONDITION

START

CONDITION

SDA

SCL

2941 F01

tof

Figure 1. Deﬁnition of Timing on I2C Bus

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