LTC6801HG-TRPBF(RevC) データシートの表示（PDF） - Linear Technology

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LTC6801HG-TRPBF
(Rev.:RevC)

Independent Multicell Battery Stack Fault Monitor

Linear Technology 

LTC6801

APPLICATIONS INFORMATION

CELL-VOLTAGE FILTERING

The LTC6801 employs a sampling system to perform its

analog-to-digital conversions and provides a conversion

result that is essentially an average over the 0.5ms conver-

sion window. If there is significant noise at frequencies near

500kHz there may be aliasing in the delta-sigma modulator.

A lowpass filter with 30dB attenuation at 500kHz may be

beneficial. Since the delta-sigma integration bandwidth is

about 1kHz, the filter corner need not be lower than this

to assure accurate conversions.

Series resistors of 1k may be inserted in the input paths

without introducing measurement error. Shunt capacitors

may be added from the cell inputs to V–, creating RC filter-

ing as shown in Figure 8. The combination of 1k and 10nF

is recommended as a robust, cost effective noise filter.

MEASURING VARIOUS CELL COUNTS

The LTC6801 is designed to measure up to 12 cells de-

pending on the state of the CC pins (See Table 5). When

using an LTC6801 configured for measuring less than

12 cells, for instance choosing to measure 8 cells by

1k

C3

1k 10nF

C2

1k 10nF

C1

10nF

V–

6801 F08

Figure 8. Adding RC Filtering to the Cell inputs

tying both CC1 and CC0 to the VREF pin, the highest cell

potential (in this case C8) must be connected to the V+

pin for proper operation. Unused cell connection pins (in

this case C9 to C12) may be left floating or may also be

tied to the highest cell potential.

500k

NTC

B = 4567

100k

500k

NTC

B = 4567

1µF

1µF

100k

V+

OV1

C12

OV0

C11

UV1

C10

UV0

C9

HYST

C8

CC1

C7 LTC6801 CC0

C6

SLT

C5

SLTOK

C4

DC

C3

EOUT

C2

EOUT

C1

SIN

V–

SIN

VTEMP1

SOUT

VTEMP2

SOUT

VREF

EIN

VREG

EIN

6801 F09

Figure 9. Driving Thermistors Directly from VREF.

Two Independent Probes With a +60°C Trip Point

10k

NTC

B = 3380

2.2k

10k

NTC

B = 3380

0.5µF

0.5µF

2.2k

LT6003

V+

OV1

C12

OV0

C11

UV1

C10

UV0

C9

HYST

C8

CC1

C7 LTC6801 CC0

C6

SLT

C5

SLTOK

C4

DC

C3

EOUT

C2

EOUT

C1

SIN

V–

SIN

VTEMP1

SOUT

VTEMP2

SOUT

VREF

EIN

VREG

EIN

6801 F10

Figure 10. Buffering VREF for Higher-Current Sensors.

Two Independent Probes With a +70°C Trip Point

6801fc

20

For more information www.linear.com/LTC6801

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