LTC6802技术手册

LTC6802

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LTC6802-1

68021fa

TYPICAL APPLICATION

DESCRIPTION

Multicell

Battery Stack Monitor

The LTC

6802-1 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

LTC6802-1 can measure up to 12 series connected bat-

tery cells with an input common mode voltage up to 60V.

In addition, multiple LTC6802-1 devices can be placed in

series to monitor the voltage of each cell in a long battery

string. The unique level-shifting serial interface allows the

serial ports of these devices to be daisy-chained without

optocouplers or isolators.

When multiple LTC6802-1 devices are connected in series

they can operate simultaneously, permitting all cell voltages

in the stack to be measured within 13ms.

To minimize power, the LTC6802-1 offers a measure mode,

which simply monitors each cell for overvoltage and un-

dervoltage conditions. A standby mode is also provided.

Each cell input has an associated MOSFET switch for

discharging overcharged cells.

For large battery stack applications requiring individually

addressable serial communications, see the LTC6802-2.

FEATURES

APPLICATIONS

Measures up to 12 Li-Ion Cells in Series (60V Max)

Stackable Architecture Enables >1000V Systems

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 Daisy-Chainable Serial Interface

High EMI Immunity

Delta Sigma Converter with Built-In Noise Filter

Open Wire Connection Fault Detection

Low Power Modes

44-Lead SSOP Package

Electric and Hybrid Electric Vehicles

High Power Portable Equipment

Backup Battery Systems

High Voltage Data Acquisition Systems

MUX

DIE TEMP

12-CELL

BATTERY

STRING

NEXT 12-CELL

PACK ABOVE

NEXT 12-CELL

PACK BELOW

–

100k NTC

100k

EXTERNAL

TEMP

SERIAL DATA

TO LTC6802-1

ABOVE

SERIAL DATA

TO LTC6802-1

BELOW

LTC6802-1

68021 TA01a

VOLTAGE

REFERENCE

REGISTERS

AND

CONTROL

12-BIT

Δ∑ ADC

MEASUREMENT ERROR (%)

TEMPERATURE (°C)

125–50

0.30

–0.30

–25 0 25 50 75 100

–0.20

–0.25

–0.10

0.10

0.20

–0.15

–0.05

0.15

0.05

0.25

7 REPRESENTATIVE

UNITS

68021 TA01b

Measurement Error Over

Extended Temperature

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

LTC6802-1

68021fa

PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS

Total Supply Voltage (V

to V

–

) .................................60V

Input Voltage (Relative to V

–

)

C1 ............................................................ –0.3V to 9V

C12 .......................................... V

– 0.6V to V

+ 0.3V

Cn (Note 5) ......................... –0.3V to min (9 • n, 60V)

Sn (Note 5) ......................... –0.3V to min (9 • n, 60V)

CSBO, SCKO, SDOI .................. V

– 0.6V to V

+ 0.3V

All other pins ........................................... –0.3V to 7V

Voltage Between Inputs

Cn to Cn-1 ................................................ –0.3V to 9V

Sn to Cn-1 ................................................ –0.3V to 9V

C12 to C8 ............................................... –0.3V to 25V

C8 to C4 ................................................. –0.3V to 25V

C4 to V

–

................................................. –0.3V to 25V

Operating Temperature Range .................–40°C to 85°C

Specified Temperature Range ..................–40°C to 85°C

Junction Temperature ........................................... 150°C

Storage Temperature Range .................. –65°C to 150°C

*n = 1 to 12

(Note 1)

TOP VIEW

G PACKAGE

44-LEAD PLASTIC SSOP

CSBO

SDOI

SCKO

C12

S12

C11

S11

C10

S10

CSBI

SDO

SDI

SCKI

MODE

GPIO2

GPIO1

WDTB

MMB

TOS

REG

REF

TEMP2

TEMP1

–

JMAX

= 150°C, θ

= 70°C/W

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE

LTC6802IG-1#PBF LTC6802IG-1#TRPBF LTC6802G-1 44-Lead Plastic SSOP –40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

LTC6802-1

68021fa

ELECTRICAL CHARACTERISTICS

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

= 25°C. V

= 43.2V, V

–

= 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

DC Specifications

ACC

Measurement Resolution Quantization of the ADC

1.5 mV/Bit

ADC Offset Voltage (Note 2)

–0.5 0.5 mV

ADC Gain Error (Note 2)

–0.12

–0.22

0.12

0.22

ERR

Total Measurement Error (Note 4)

CELL

= 0V

CELL

= 2.3V

CELL

= 2.3V

CELL

= 3.6V

CELL

= 3.6V

CELL

= 4.2V

CELL

= 4.2V

CELL

= 4.6V

TEMP

= 2.3V

TEMP

= 3.6V

TEMP

= 4.2V

–2.8

–5.1

–4.3

–7.9

–5

–9.2

–5.1

–7.9

–9.2

0.8

±8

2.8

5.1

4.3

7.9

9.2

5.1

7.9

9.2

CELL

Cell Voltage Range Full Scale Voltage Range 5 V

Common Mode Voltage Range Measured

Relative to V

–

Range of Inputs CN for <0.25% Gain Error, N = 3 to 11

Range of Input C3 for <1% Gain Error

Range of Input C2 for <0.25% Gain Error

Range of Input C1 for <0.25% Gain Error

3.7

1.8

1.2

5 • N

Overvoltage (OV) Detection Level Programmed for 4.2V

4.182 4.200 4.218 V

Undervoltage (UV) Detection Level Programmed for 2.3V

2.290 2.300 2.310 V

Die Temperature Measurement Error Error in Measurement at 125°C 3 °C

REF

Reference Pin Voltage R

LOAD

= 100k to V

–

3.020

3.015

3.065

3.110

3.115

Reference Voltage Temperature Coefficient 8 ppm/°C

Reference Voltage Thermal Hysteresis 25°C to 85°C and 25°C to –40°C 100 ppm

Reference Voltage Long Term Drift 60 ppm/√khr

REG

Regulator Pin Voltage 10 < V

< 50, No Load

LOAD

= 4mA

4.5

4.1

5.0

4.8

5.5 V

Regulator Pin Short Circuit Current Limit

58 mA

Supply Voltage, V

Relative to V

–

ERR

Specifications Met

Timing Specifications Met

Input Bias Current In/Out of Pins C1 Thru C12

When Measuring Cells

When Not Measuring Cells

–10

10 μA

Supply Current, Active Current Into the V

Pin when Measuring Voltages

with the ADC

0.8 1.1

1.2

Supply Current, Monitor Mode Average Current Into the V

Pin While Monitoring

for UV and OV Conditions

Continuous Monitoring (CDC = 2)

Monitor Every 130ms (CDC = 5)

Monitor Every 500ms (CDC = 6)

Monitor Every 2s (CDC = 7)

800

225

150

100

μA

Supply Current, Idle Current into the V

Pin When Idle

All Serial Port Pins at Logic ‘1’

60 80

μA

Supply Current, Serial I/O All Serial Port Pins at Logic ‘0’ V

MODE

= 0, This

Current is Added to I

or I

3 4.5 mA

LTC6802-1

68021fa

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The ADC specifications are guaranteed by the Total Measurement

Error (V

ERR

) specification.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Discharge Switch On-Resistance V

CELL

> 3V (Note 3)

10 20 Ω

Temperature Range

–40 85 °C

Thermal Shutdown Temperature 145 °C

Thermal Shutdown Hysteresis 5°C

Voltage Mode Timing Specifications

CYCLE

Measurement Cycle Time Time Required to Measure 11 or 12 Cells

Time Required to Measure Up to 10 Cells

Time Required to Measure 1 Cell

9.2

1.2

13.5

1.5

SDI Valid to SCKI Rising Setup

10 ns

SDI Valid to SCKI Rising Hold

250 ns

SCKI Low

400 ns

SCKI High

400 ns

CSBI Pulse Width

400 ns

SCKI Rising to CSBI Rising

100 ns

CSBI Falling to SCKI Rising

100 ns

SCKI Falling to SDO Valid

250 ns

Clock Frequency

1 MHz

Watchdog Timer Time Out Period

1 2.5 s

Timing Specifications

PD1

CSBI to CSBO C

CSBO

= 150pF

600 ns

PD2

SCKI to SCKO C

SCKO

= 150pF

300 ns

PD3

SDI to SDOI Write Delay C

SDOI

= 150pF

300 ns

PD4

SDOI to SDI Read Delay C

SDO

= 150pF

300 ns

Voltage Mode Digital I/O Specifications

Digital Input Voltage High Pins SCKI, SDI, and CSBI

Digital Input Voltage Low Pins SCKI, SDI, and CSBI

0.8 V

Digital Output Voltage Low Pin SDO; Sinking 500μA

0.3 V

Current Mode Digital I/O Specifications

IH1

Digital Input Current High Pins CSBI, SCKI, and SDI (Write)

10 μA

IL1

Digital Input Current Low Pins CSBI, SCKI, and SDI (Write)

1000 μA

IH2

Digital Input Current High Pin SDOI (Read)

–1000 μA

IL2

Digital Input Current Low Pin SDOI (Read)

–10 μA

OH1

Digital Output Current High Pins CSBO, SCKO, and SDOI (Write)

310 μA

OL1

Digital Output Current Low Pins CSBO, SCKO, and SDOI (Write)

1000 1200 1650 μA

OH2

Digital Output Current High Pin SDI (Read)

–1650 –1200 –1000 μA

OL2

Digital Output Current Low Pin SDI (Read)

–10 –3 0 μA

ELECTRICAL CHARACTERISTICS

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

= 25°C. V

= 43.2V, V

–

= 0V, unless otherwise noted.

Note 3: Due to the contact resistance of the production tester, this

specification is tested to relaxed limits. The 20Ω limit is guaranteed by

design.

Note 4: V

CELL

refers to the voltage applied across the following pin

combinations: Cn to Cn-1 for n = 2 to 12, C1 to V

–

. V

TEMP

refers to the

voltage applied from V

TEMP1

or V

TEMP2

to V

–

Note 5: These absolute maximum ratings apply provided that the voltage

between inputs do not exceed their absolute maximum ratings.

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