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DS2786G+TR PDF预览

DS2786G+TR

更新时间: 2024-11-01 06:54:39
品牌 Logo 应用领域
美信 - MAXIM 仪表
页数 文件大小 规格书
22页 304K
描述
Stand-Alone OCV-Based Fuel Gauge

DS2786G+TR 数据手册

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19-4637; 5/09  
DS2786  
Stand-Alone OCV-Based  
Fuel Gauge  
www.maxim-ic.com  
GENERAL DESCRIPTION  
FEATURES  
The DS2786 estimates available capacity for  
rechargeable Li-Ion and Li-Ion Polymer batteries  
based on the cell voltage in the open-circuit state  
following a relaxation 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 discharging,  
which preclude OCV measurements, the DS2786  
uses coulomb counting as a secondary means of  
estimating relative capacity.  
.
Relative Capacity Calculated from  
Combination Coulomb Counter and Open-  
Circuit Cell Voltage (OCV) Battery Model  
Accurate Warning of Low Battery Conditions  
Even On First Cycle (No Learn Cycle Needed)  
12-Bit Battery Voltage Measurement:  
±10mV Accuracy  
.
.
1.22mV LSB, 0V to 4.5V Input Range  
11-Bit Bidirectional Current Measurement:  
25V LSB, ±51.2mV Dynamic Range  
1.67mA LSB, ±3.4A (RSNS = 15m)  
Current Accumulation Measurement  
Resolution:  
.
.
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.  
±204.8mVh Range  
±13.65Ah (RSNS = 15m)  
Internal Temperature Measurement:  
0.125°C LSB, ±3°C Accuracy  
Two 11-Bit Aux Input Voltage Measurements:  
±8 LSB Accuracy, Ratiometric Inputs  
Eliminate Supply Accuracy Issues  
VOUT Pin Drives Resistive Dividers, Reduces  
Current Consumption  
.
.
The DS2786 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 measurements of a pack identification  
resistor and pack thermistor are supported by  
ratiometric measurements on two auxiliary inputs.  
.
.
.
2-Wire Interface  
Low Power Consumption:  
Active Current: 50A typ, 80A max  
Sleep Current: 1A typ, 3A max  
APPLICATIONS  
ORDERING INFORMATION  
3G Multimedia Wireless Handsets  
Digital Still Cameras  
PART  
TEMP RANGE PIN-PACKAGE  
DS2786G+  
-20ºC to +70ºC 10 TDFN-EP*  
-20ºC to +70ºC 10 TDFN-EP*  
Digital Audio (MP3) Players  
DS2786G+T&R  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T&R = Tape and reel.  
TYPICAL OPERATING CIRCUIT  
*EP = Exposed pad.  
PIN CONFIGURATION  
3mm x 3mm TDFN-10  
Top View  
Commands, Registers, and Modes are capitalized for clarity.  
1 of 22  

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