LTC6801

1

6801p

Detection

Monitoring without a Microcontroller

–40

20

95

–10

50

110 125

580

–25

35

65

TEMPERATURE (°C)

1.0

–0.8

0.8

0.4

0

–0.4

0.6

0.2

–0.2

–0.6

–1.0

6801 TA01b

OV = 4.120V

5 TYPICAL UNITS

BLOCK DIAGRAM

DESCRIPTION

Independent Multicell

Battery Stack Fault Monitor

The LTC

porating a 12-bit ADC, a precision independent voltage

reference, sampled comparator, and a high voltage input

multiplexer. The LTC6801 can monitor as many as 12 series

connected battery cells for overvoltage, undervoltage, and

overtemperature conditions, indicating whether the cells

are within specified parameters. The LTC6801 generates

a clock output when no fault conditions exist. Differential

clocking provides high noise immunity and ensures that

battery stack fault conditions cannot be hidden by frozen

bits or short circuit conditions.

Each LTC6801 can operate with a battery stack voltage up

to 60V and multiple LTC6801 devices can be stacked to

monitor each individual cell in a long battery string. When

multiple devices are stacked, the status signal of each

LTC6801 can be daisy-chained, without opto-couplers or

isolators, providing a single status output for the entire

battery string.

The LTC6801 is configurable by external pin strapping.

Adjustable overvoltage and undervoltage thresholds sup-

port various Li-Ion chemistries. Selectable measurement

times allow users to save power.

FEATURES

APPLICATIONS

6801 TA01a

1

2

3

12

13

20

22

14

15

16

NTC

NTC

C1

C2

C11

C12

V+

V–

NEXT LOWER

CELL PACK

NEXT HIGHER

CELL PACK

12

MUX

“CELLS GOOD”

ENABLE

INPUT

ISOLATION

CLOCK SIGNAL

INPUT ENABLES

THE LTC6801

CLOCK SIGNAL

OUTPUT INDICATES

SYSTEM “OK”

STATUS

OUTPUT

CONTROL

LOGIC

17

REFERENCE

LTC6801

ADC

0V Detection Level Error

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.

Electrical Specifications Subject to Change