TC7129 datasheet(5/24 Pages) MICROCHIP

Part #	TC7129

Description	4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

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Manufacturer	MICROCHIP [Microchip Technology]

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DS21459B-page 5

TC7129

2.0

PIN DESCRIPTIONS

Thedescriptionsof the pins arelistedinTable2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin No.

40-Pin PDIP

Pin No.

44-Pin PQFP

Pin No.

44-Pin PLCC

Symbol

Function

1

40

2

OSC1

Input to first clock inverter.

2

41

3

OSC3

Output of second clock inverter.

3

42

4

ANNUNCIATOR Backplane square wave output for driving annunciators.

443

5

B1,C1, CONT

Output to display segments.

544

6

A1,G1,D1

Output to display segments.

61

7

F1,E1,DP1

Output to display segments.

72

8

B2,C2, LO BATT Output to display segments.

83

9

A2,G2,D2

Output to display segments.

94

10

F2,E2,DP2

Output to display segments.

10

5

11

B3,C3, MINUS

Output to display segments.

11

7

13

A3,G3,D3

Output to display segments.

12

8

14

F3,E3,DP3

Output to display segments.

13

9

15

B4,C4,BC5

Output to display segments.

14

10

16

A4,D4,G4

Output to display segments.

15

11

17

F4,E4,DP4

Output to display segments.

16

12

18

BP3

Backplane #3 output to display.

17

13

19

BP2

Backplane #2 output to display.

18

14

20

BP1

Backplane #1 output to display.

19

15

21

VDISP

Negative rail for display drivers.

20

16

22

DP4/OR

Input: When HI, turns on most significant decimal point.

Output: Pulled HI when result count exceeds ±19,999.

21

18

24

DP3/UR

Input: Second most significant decimal point on when HI.

Output: Pulled HI when result count is less than ±1000.

22

19

25

LATCH/HOLD

Input: When floating, ADC operates in the Free Run mode. When

pulled HI, the last displayed reading is held. When pulled LO, the

result counter contents are shown incrementing during the

de-integrate phase of cycle.

Output: Negative going edge occurs when the data latches are

updated. Can be used for converter status signal.

23

20

26

V-

Negative power supply terminal.

24

21

27

V+

Positive power supply terminal and positive rail for display drivers.

25

22

28

INT IN

Input to integrator amplifier.

26

23

29

INT OUT

Output of integrator amplifier.

27

24

30

CONTINUITY

Input: When LO, continuity flag on the display is OFF. When HI,

continuity flag is ON.

Output: HI when voltage between inputs is less than +200mV. LO

when voltage between inputs is more than +200mV.

28

25

31

COMMON

Sets Common mode voltage of 3.2V below V+ for DE, 10X, etc.

Can be used as pre-regulator for external reference.

29

26

32

CREF+

Positive side of external reference capacitor.

30

27

33

CREF-

Negative side of external reference capacitor.

31

29

35

BUFFER

Output of buffer amplifier.

32

30

36

IN LO

Negative input voltage terminal.

33

31

37

IN HI

Positive input voltage terminal.

34

32

38

REF HI

Positive reference voltage.

35

33

39

REF LO

Negative reference voltage

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