LTC6803 データシートの表示（PDF） - Linear Technology

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LTC6803

Multicell Battery Stack Monitor

Linear Technology 

LTC6803-1/LTC6803-3

APPLICATIONS INFORMATION

situation might occur in a modular battery system during

initial installation or a service procedure. The daisy-chain

ports are protected from the reverse potential in this sce-

nario by external series high voltage diodes required in

the upper port data connections as shown in Figure 14.

During the charging phase of operation, this fault would

lead to forward biasing of daisy-chain ESD clamps that

would also lead to part damage. An alternative connection

to carry current during this scenario will avoid this stress

from being applied (Figure 14).

+

LTC6803-1

V–

(NEXT HIGHER IN STACK)

PROTECT

AGAINST

BREAK

HERE

OPTIONAL

REDUNDANT

CURRENT

PATH

+

SDO SDI SCKI CSBI

RSO7J

×3

SDOI SCKO CSBO

V+

LTC6803-1

(NEXT LOWER IN STACK)

860313 F14

Figure 14. Reverse-Voltage Protection for

the Daisy Chain (One Link Connection Shown)

Internal Protection Diodes

Each pin of the LTC6803 has protection diodes to help

prevent damage to the internal device structures caused

by external application of voltages beyond the supply rails

as shown in Figure 15. The diodes shown are conventional

silicon diodes with a forward breakdown voltage of 0.5V.

The unlabeled Zener diode structures have a reverse-

breakdown characteristic which initially breaks down at

12V then snaps back to a 7V clamping potential. The Zener

diodes labeled ZCLAMP are higher voltage devices with an

initial reverse breakdown of 30V snapping back to 25V.

The forward voltage drop of all Zeners is 0.5V. Refer to

Figure 15 in the event of unpredictable voltage clamping

or current flow. Limiting the current flow at any pin to

±10mA will prevent damage to the IC.

4 V+

5 C12

6 S12

7 C11

8 S11

9 C10

10 S10

11 C9

S9

12

C8

13

14 S8

15 C7

16 S7

17 C6

18 S6

19 C5

20 S5

21 C4

S4

22

C3

23

24 S3

25 C2

26 S2

27 C1

28 S1

29 C0

LTC6803-3

ZCLAMP

SCKO 3

SDOI 2

CSBO 1

ZCLAMP

ZCLAMP

ZCLAMP

ZCLAMP

ZCLAMP

ZCLAMP

ZCLAMP

ZCLAMP

VREG

35

VREF

34

VTEMP2

33

VTEMP1 32

CSBI 44

SDO 43

SDI 42

SCKI 41

VMODE

40

GPIO2

39

GPIO1 38

WDTB 37

TOS 36

V–

30

NOTE: NOT SHOWN ARE PN DIODES TO ALL OTHER PINS FROM PIN 30

Figure 15. Internal Protection Diodes

680313 F15

READING EXTERNAL TEMPERATURE PROBES

The LTC6803 includes two channels of ADC input, VTEMP1

and VTEMP2, that are intended to monitor thermistors

(tempco about –4%/°C generally) or diodes (–2.2mV/°C

typical) located within the cell array. Sensors can be

powered directly from VREF as shown in Figure 16 (up to

60µA total).

680313f

31

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