Datasheet > LTC2941IDCBTRMPBF

LTC2941IDCBTRMPBF

更新时间： 2022-12-19 14:35:26

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	160K
描述
Battery Gas Gauge with I2C Interface

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LTC2941IDCBTRMPBF 数据手册

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LTC2941

OPERATION

Overview

Aprogrammableprescalerisincrementedordecremented

every time the integrator changes ramp direction. The

prescaler effectively increases integration time by a factor

Mprogrammablefrom1to128. Ateachunderoroverﬂow

oftheprescaler, theaccumulatedchargeisincrementedor

decremented one count. The value of accumulated charge

The LTC2941 is a battery gas gauge device designed for

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

a terminal voltage between 2.7ꢀ and ±.±ꢀ. A precision

coulomb counter integrates current through a sense

resistor between the battery’s positive terminal and the

load or charger.

is read via the I C interface.

Power-Up Sequence

Coulomb Counter

When ꢀ

rises above a threshold of approximately

SENSE

Charge is the time integral of current. The LTC2941 mea-

suresbatterycurrentbymonitoringthevoltagedeveloped

acrossasenseresistorandthenintegratesthisinformation

2.±ꢀ, the LTC2941 generates an internal power-on reset

(POR) signal and sets all registers to their default state.

In the default state, the coulomb counter is active. The

accumulated charge is set to mid-scale (7FFFh), the

low threshold registers are set to 5555h and all the high

threshold registers are set to FFFFh. The alert mode is

enabled and the coulomb counter pre-scaling factor M

is set to 128.

to infer charge. The differential voltage between SENSE

–

andSENSE isappliedtoanauto-zeroeddifferentialanalog

integrator to convert the measured current to charge.

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.

STATUS

CHARGER

LOAD

CONTROL

REFHI

ꢀ

SUPPLY

CONTROL

–

SENSE

AL/CC

LOGIC

REGISTERS

–

PRE-

SCALER

SCL

SDA

I C/

SENSE

SMBus

ACR

SENSE

GND

–

BAT

POLARITY

DETECTION

THRESHOLDS

REFLO

BATTERY

2941 F53

Figure 3. Coulomb Counter Section of the LTC2941

2941f

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

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