LTC2942I(RevA) Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC2942I
(Rev.:RevA)

Battery Gas Gauge with Temperature, Voltage Measurement

Linear Technology 

LTC2942

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

tHD,DATO

tOF

Data Hold Time Output

Data Output Fall Time

(Notes 7, 8)

l

0.3

l 20 + 0.1 • CB

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

register depends on the value of RSENSE and the setting of the internal

prescaling factor M:

qLSB

= 0.085mAh • 50mΩ

RSENSE

•

M

128

Note 5: Deviation of qLSB from its nominal value.

Note 6: The quantization step of the 14-bit ADC in voltage mode and

10-bit ADC in temperature mode is not to be mistaken with the LSB of the

combined 16-bit voltage registers (I, J) and 16-bit temperature registers

(M, N).

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

Voltage and Temperature Registers section for more information.

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

See Choosing RSENSE and Choosing Coulomb Counter Prescaler M section

for more information. 1mAh = 3.6C (coulombs).

TIMING DIAGRAM

SDA

SCL

tHD, STA

START

CONDITION

tSU, DAT

tHD, DATO,

tHD, DATI

tof

tSU, STA

tHD, STA

tSU, STO

tBUF

2942 F01

REPEATED START

CONDITION

Figure 1. Definition of Timing on I2C Bus

STOP

CONDITION

START

CONDITION

2942fa

4

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