DS2786B

更新时间： 2024-11-01 12:49:59

品牌	Logo	应用领域
美信 - MAXIM		仪表
页数	文件大小	规格书
21页	369K
描述
Stand-Alone OCV-Based Fuel Gauge

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数据手册

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DS2786B 数据手册

19-5223; Rev 1; 4/10

Stand-Alone OCV-Based Fuel Gauge

DS2786B

General Description

Features

♦ Relative Capacity Calculated from Combination

Coulomb Counter and Open-Circuit Cell Voltage

(OCV) Battery Model

The DS2786B estimates available capacity for recharge-

able Li-ion (Li+) and Li+ polymer batteries based on the

cell voltage in the open-circuit state following a relax-

ation period. The open-circuit voltage (OCV) is used to

determine relative cell capacity based on a lookup table

stored in the IC. This capability makes accurate capacity

information available immediately after a battery pack is

inserted. During periods of moderate to high rate dis-

charging, which preclude OCV measurements, the

DS2786B uses coulomb counting as a secondary

means of estimating relative capacity.

♦ Accurate Warning of Low-Battery Conditions

Even on First Cycle (No Learn Cycle Needed)

♦ 12-Bit Battery Voltage Measurement

±1ꢀmV Accuracy

1.22mV LSB, ꢀV to 4.5V Input Range

♦ 11-Bit Bidirectional Current Measurement

25µV LSB, ±51.2mV ꢁynamic Range

1.67mA LSB, ±±.4A (R

= 15mΩ)

SNS

Remaining capacity is reported in percent, along with

cell voltage, current, and temperature information. Cell

characteristics and application parameters used in the

calculations are stored in on-chip EEPROM.

♦ Current Accumulation Measurement Resolution

±2ꢀ4.ꢂmVꢃ Range

±1±.65Aꢃ (R

= 15mΩ)

SNS

♦ Internal Temperature Measurement

ꢀ.125°C LSB, ±±°C Accuracy

The DS2786B is intended for use on the host side of

portable devices, though it can also be mounted within a

battery pack. Measurement and estimated capacity data

are accessed through an I²C interface. Temperature

data is available from an on-die sensor. Resistance mea-

surements of a pack identification resistor and pack ther-

mistor are supported by ratiometric measurements on

two auxiliary inputs.

♦ Two 11-Bit Auxiliary Input-Voltage Measurements

±ꢂ LSB Accuracy, Ratiometric Inputs Eliminate

Supply Accuracy Issues

♦ V

Pin ꢁrives Resistive ꢁividers, Reduces

OUT

Current Consumption

♦ 2-Wire Interface

♦ Low Power Consumption

The DS2786B comes in a 10-pin, lead-free, TDFN 3mm

x 3mm package with an exposed pad (EP).

Active Current: 5ꢀµA (typ), ꢂꢀµA (max)

Sleep Current: 1µA (typ), ±µA (max)

Ordering Information

Applications

3G Multimedia Wireless Handsets

PART

DS2786BG+

TEMP RANGE

-20°C to +70°C

PIN-PACKAGE

10 TDFN-EP*

Digital Still Cameras

Digital Audio (MP3) Players

DS2786BG+T&R

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

T&R = Tape and reel.

Operating Diagram

SYSTEM

μP

OUT

DS2786B

Li+

I C

INTERFACE

SDA

SCL

SNS

AIN0

AIN1

PROTECTION

CIRCUIT

SNS

(EEPROM PROGRAMMING TEST POINT NOT SHOWN)

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim ꢁirect at 1-ꢂꢂꢂ-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...21

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与DS2786B相关器件

型号	品牌	获取价格	描述	数据表
DS2786BG+	MAXIM	获取价格	Stand-Alone OCV-Based Fuel Gauge
DS2786BG+T&R	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, PDSO10, 3 X 3 MM, ROHS COMPLIANT, TDF
DS2786BG+TR	MAXIM	获取价格	Stand-Alone OCV-Based Fuel Gauge
DS2786BK	MAXIM	获取价格	Power Supply Support Circuit
DS2786G+	MAXIM	获取价格	Standalone OCV-Based Fuel Gauge
DS2786G+T&R	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, 3 X 3 MM, LEAD FREE, TDFN-10
DS2786G+T&R	MAXIM	获取价格	Standalone OCV-Based Fuel Gauge
DS2786G+TR	MAXIM	获取价格	Stand-Alone OCV-Based Fuel Gauge
DS2788	MAXIM	获取价格	Stand-Alone Fuel-Gauge IC with LED Display Drivers
DS2788	ADI	获取价格	独立式电量计IC，提供LED显示驱动器

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