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LTC6802-2

Description
multicell addressable battery stack monitor
File Size289KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC6802-2 Overview

multicell addressable battery stack monitor

LTC6802-2
Multicell Addressable
Battery Stack Monitor
FEATURES
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DESCRIPTION
The LTC
®
6802-2 is a complete battery monitoring IC that
includes a 12-bit ADC, a precision voltage reference, a
high voltage input multiplexer and a serial interface. Each
LTC6802-2 can measure 12 series connected battery cells,
with a total input voltage up to 60V. The voltage on all 12
input channels can be measured within 13ms.
Many LTC6802-2 devices can be stacked to measure the
voltage of each cell in a long battery string. Each LTC6802-2
has an individually addressable serial interface, allowing
up to 16 LTC6802-2 devices to interface to one control
processor and operate simultaneously.
To minimize power, the LTC6802-2 offers a measure mode
to monitor each cell for overvoltage and undervoltage
conditions. A standby mode is also provided to reduce
supply current to 50μA.
Each cell input has an associated MOSFET switch that can
discharge any overcharged cell.
The related LTC6802-1 offers a serial interface that allows
the serial ports of multiple LTC6802-1 devices to be daisy
chained without opto-couplers or isolators.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Measures up to 12 Li-Ion Cells in Series (60V Max)
Stackable Architecture Enables Monitoring High
Voltage Battery Stacks
Individually Addressable with 4-Bit Address
0.25% Maximum Total Measurement Error
13ms to Measure All Cells in a System
Cell Balancing:
On-Chip Passive Cell Balancing Switches
Provision for Off-Chip Passive Balancing
Two Thermistor Inputs Plus On-board
Temperature Sensor
1MHz Serial Interface with Packet Error Checking
High EMI Immunity
Delta Sigma Converter With Built In Noise Filter
Open Wire Connection Fault Detection
Low Power Modes
44-Lead SSOP Package
APPLICATIONS
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Electric and Hybrid Electric Vehicles
High Power Portable Equipment
Backup Battery Systems
High Voltage Data Acquisition Systems
TYPICAL APPLICATION
NEXT 12-CELL
PACK ABOVE
V
+
LTC6802-2
DIE TEMP
MEASUREMENT ERROR (%)
0.30
0.25
0.20
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–50
68022 TA01a
Measurement Error Over
Extended Temperature
7 REPRESENTATIVE UNITS
V
S
= 43.2V
CELL VOLTAGE 3.6V
SERIAL DATA
REGISTERS
AND
CONTROL
MUX
4-BIT
ADDRESS
12-CELL
BATTERY
STRING
12-BIT
Δ∑ ADC
V
NEXT 12-CELL
PACK BELOW
EXTERNAL
TEMP
VOLTAGE
REFERENCE
–25
0
25
50
75
TEMPERATURE (°C)
100
125
68022 TA01b
100k
100k NTC
68022f
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