Datasheet > LTC2942CDCBTRMPBF

LTC2942CDCBTRMPBF

更新时间： 2022-12-26 05:39:05

品牌	Logo	应用领域
凌特 - Linear		电池仪表
页数	文件大小	规格书
16页	174K
描述
Battery Gas Gauge with Temperature, Voltage Measurement

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LTC2942CDCBTRMPBF 数据手册

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LTC2942

OPERATION

Overview

Aprogrammableprescalereffectivelyincreasesintegration

time by a factor M programmable from 1 to 128. At each

underﬂow or overﬂow of the prescaler, the accumulated

chargeregister(ACR)valueisincrementedordecremented

one count. The value of accumulated charge is read via

The LTC2942 is a battery gas gauge device designed for

use with single Li-Ion cells and other battery types with a

terminalvoltageat2.7ꢀto±.±ꢀ.Itmeasuresbatterycharge

and discharge, battery voltage and chip temperature.

the I C interface.

A precision coulomb counter integrates current through a

sense resistor between the battery’s positive terminal and

theloadorcharger.Batteryvoltageandon-chiptemperature

are measured with an internal 14-bit/15-bit ADC.

Voltage and Temperature ADC

The LTC2942 includes a 14-bit No Latency ΔΣ analog-to-

digital converter, with internal clock and voltage reference

circuits.

Coulomb Counter

The ADC can either be used to monitor the battery voltage

Charge is the time integral of current. The LTC2942 mea-

suresbatterycurrentbymonitoringthevoltagedeveloped

acrossasenseresistorandthenintegratesthisinformation

–

atSENSE ortoconverttheoutputoftheon-chiptempera-

turesensor.Thesensorgeneratesavoltageproportionalto

temperature with a slope of 2.±mꢀ/K resulting in a voltage

of 7±5mꢀ at 27°C.

to infer charge. The differential voltage between SENSE

–

andSENSE isappliedtoanauto-zeroeddifferentialanalog

integrator to convert the measured current to charge.

Conversion of either temperature or voltage is triggered

by setting the control register via the I C interface. The

When the integrator output ramps to REFHI or REFLO

levels, switches S1, S2, S3 and S4 toggle to reverse the

rampdirection. Byobservingtheconditionoftheswitches

and the ramp direction, polarity is determined.

LTC2942 features an automatic mode where a voltage and

atemperatureconversionareexecutedeverytwoseconds.

At the end of each conversion the corresponding registers

are updated and the converter goes to sleep to minimize

quiescent current.

CHARGER

LOAD

REFHI

–

ꢀ

CONTROL

LOGIC

–

SENSE

–

ACR

SENSE

PRESCALER

SENSE

–

BAT

POLARITY

DETECTION

REFLO

GND

BATTERY

2942 F52

Figure 2. Coulomb Counter Section of the LTC2942

2942f

1...4 5 678 9 10...16

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