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TC7126

3-1/2 Digit Analog-to-Digital Converters

Microchip Technology 

TC7126/A

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

Pin Number

(40-Pin PDIP)

Normal

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

PIN FUNCTION TABLE

(Reversed) Symbol

Description

(40)

V+ Positive supply voltage.

(39)

D1

Activates the D section of the units display.

(38)

C1

Activates the C section of the units display.

(37)

B1

Activates the B section of the units display.

(36)

A1

Activates the A section of the units display.

(35)

F1

Activates the F section of the units display.

(34)

G1

Activates the G section of the units display.

(33)

E1

Activates the E section of the units display.

(32)

D2

Activates the D section of the tens display.

(31)

C2

Activates the C section of the tens display.

(30)

B2

Activates the B section of the tens display.

(29)

A2

Activates the A section of the tens display.

(28)

F2

Activates the F section of the tens display.

(27)

E2

Activates the E section of the tens display.

(26)

D3

Activates the D section of the hundreds display.

(25)

B3

Activates the B section of the hundreds display.

(24)

F3

Activates the F section of the hundreds display.

(23)

E3

Activates the E section of the hundreds display.

(22)

AB4 Activates both halves of the 1 in the thousands display.

(21)

POL Activates the negative polarity display.

(20)

BP LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).

(19)

G3

Activates the G section of the hundreds display.

(18)

A3

Activates the A section of the hundreds display.

(17)

C3

Activates the C section of the hundreds display.

(16)

G2

Activates the G section of the tens display.

(15)

V-

Negative power supply voltage.

(14)

VINT The integrating capacitor should be selected to give the maximum voltage swing that

ensures component tolerance buildup will not allow the integrator output to saturate.

When analog common is used as a reference and the conversion rate is 3 readings

per second, a 0.047μF capacitor may be used. The capacitor must have a low

dielectric constant to prevent rollover errors. See Section 6.3 “Integrating Capaci-

tor (CINT)”, Integrating Capacitor for additional details.

(13)

VBUFF Integration resistor connection. Use a 180kΩ resistor for a 200mV full-scale range

and a 1.8MΩ resistor for a 2V full scale range.

(12)

CAZ The size of the auto-zero capacitor influences system noise. Use a 0.33μF capacitor

for 200mV full scale, and a 0.033μF capacitor for 2V full scale. See Section 6.1

“Auto-Zero Capacitor (CAZ)”, Auto-Zero Capacitor for additional details.

(11)

VIN- The analog LOW input is connected to this pin.

(10)

VIN+ The analog HIGH input signal is connected to this pin.

(9)

ANALOG This pin is primarily used to set the Analog Common mode voltage for battery opera-

COMMON tion, or in systems where the input signal is referenced to the power supply. It also

acts as a reference voltage source. See Section 7.3 “Analog Common (Pin 32)”,

Analog Common for additional details.

(8)

CREF- See Pin 34.

© 2006 Microchip Technology Inc.

DS21458C-page 7

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