TC826

DS21477B-page 4

© 2002 Microchip Technology Inc.

2.0

PIN DESCRIPTION

Thedescriptionsof the pins arelistedinTable2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin Number

(64-Pin PQFP)

Symbol

Description

1

NC

Positive analog signal input.

2ANALOG

COMMON

Establishes the internal analog ground point. Analog common is set to 2.9V below the

positive supply COMMON by an internal zener reference circuit. The voltage difference

inputatREF IN (Pin 5).

3

+IN

Positive analog signal input.

4

-IN

Negative analog signal input.

5

REF IN

Reference voltage positive input. Measured relative to analog common.

REF IN

≈ Full Scale/2.

Reference capacitor connection.

Reference capacitor connection.

Positive supply terminal.

Buffer output. Integration resistor connection.

10

Negative comparator input. Auto-zero capacitor connection.

11

Integrator output. Integration capacitor connection.

12

Negative supply terminal.

13

OSC1

14

OSC2

15

BP

LCD Backplane driver.

16

BAR 0

LCD Segment driver: Bar 0.

17

NC

No connection.

18

BAR 1

LCD Segment driver: Bar 1.

19

BAR 2

LCD Segment driver: Bar 2.

20

BAR 3

LCD Segment driver: Bar 3.

21

BAR 4

LCD Segment driver: Bar 4.

22

BAR 5

LCD Segment driver: Bar 5.

23

BAR 6

LCD Segment driver: Bar 6.

24

BAR 7

LCD Segment driver: Bar 7.

25

BAR 8

LCD Segment driver: Bar 8.

26

BAR 9

LCD Segment driver: Bar 9.

27

BAR 10

LCD Segment driver: Bar 10.

28

BAR 11

LCD Segment driver: Bar 11.

29

BAR 12

LCD Segment driver: Bar 12.

30

BAR 13

LCD Segment driver: Bar 13.

31

BAR 14

LCD Segment driver: Bar 14.

32

BAR 15

LCD Segment driver: Bar 15.

33

BAR 16

LCD Segment driver: Bar 16.

34

BAR 17

LCD Segment driver: Bar 17.

35

BAR 18

LCD Segment driver: Bar 18.

36

BAR 19

LCD Segment driver: Bar 19.

37

BAR 20

LCD Segment driver: Bar 20.

38

BAR 21

LCD Segment driver: Bar 21.

39

BAR 22

LCD Segment driver: Bar 22.

40

BAR 23

LCD Segment driver: Bar 23.