4

TC811

© 2001 Microchip Technology Inc.

DS21472A

3-1/2 Digit Analog-To-Digital Converter with

Hold and Differential Reference Inputs

TC811-7 11/5/96

PIN DESCRIPTION

Pin No.

40-Pin Plastic DIP

Symbol

Description

1

HLDR

Hold pin, logic 1 holds present display reading.

Activates the D section of the units display.

Activates the C section of the units display.

Activates the B section of the units display.

Activates the A section of the units display.

Activates the F section of the units display.

Activates the G section of the units display.

Activates the E section of the units display.

Activates the D section of the tens display.

10

Activates the C section of the tens display.

11

Activates the B section of the tens display.

12

Activates the A section of the tens display.

13

Activates the F section of the tens display.

14

Activates the E section of the tens display.

15

Activates the D section of the hundreds display.

16

Activates the B section of the hundreds display.

17

Activates the F section of the hundreds display.

18

Activates the E section of the hundreds display.

19

Activates both halves of the 1 in the thousands display.

20

POL

Activates the negative polarity display.

21

BP

Backplane drive output.

22

Activates the G section of the hundreds display.

23

Activates the A section of the hundreds display.

24

Activates the C section of the hundreds display.

25

Activates the G section of the tens display.

26

Negative power supply voltage.

27

28

29

30

Analog input low.

31

+

Analog input high.

32

COM

Analog Common: Internal zero reference.

33

V

–

REF

Reference input low.

34

C

–

REF

Negative connection for reference capacitor.

35

C

+

REF

Positive connection for reference capacitor.

36

V

+

REF

Reference input high.

37

TEST

38

Positive power supply voltage.

39

Crystal oscillator output.

40

Crystal oscillator input.