TC7106A(2002) 데이터 시트보기 (PDF) - Microchip Technology

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TC7106A
(Rev.:2002)

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

Microchip Technology 

TC7106/A/TC7107/A

2.0 PIN DESCRIPTIONS

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

TABLE 2-1: PIN FUNCTION TABLE

Pin Number

Pin No.

(40-Pin PDIP) (40-Pin PDIP)

Normal

(Reversed

Symbol

Description

1

(40)

V+

Positive supply voltage.

2

(39)

D1

Activates the D section of the units display.

3

(38)

C1

Activates the C section of the units display.

4

(37)

B1

Activates the B section of the units display.

5

(36)

A1

Activates the A section of the units display.

6

(35)

F1

Activates the F section of the units display.

7

(34)

G1

Activates the G section of the units display.

8

(33)

E1

Activates the E section of the units display.

9

(32)

D2

Activates the D section of the tens display.

10

(31)

C2

Activates the C section of the tens display.

11

(30)

B2

Activates the B section of the tens display.

12

(29)

A2

Activates the A section of the tens display.

13

(28)

F2

Activates the F section of the tens display.

14

(27)

E2

Activates the E section of the tens display.

15

(26)

D3

Activates the D section of the hundreds display.

16

(25)

B3

Activates the B section of the hundreds display.

17

(24)

F3

Activates the F section of the hundreds display.

18

(23)

E3

Activates the E section of the hundreds display.

19

(22)

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

20

(21)

POL Activates the negative polarity display.

21

(20)

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

22

(19)

G3

Activates the G section of the hundreds display.

23

(18)

A3

Activates the A section of the hundreds display.

24

(17)

C3

Activates the C section of the hundreds display.

25

(16)

G2

Activates the G section of the tens display.

26

(15)

V-

Negative power supply voltage.

27

(14)

VINT Integrator output. Connection point for integration capacitor. See INTEGRATING

CAPACITOR section for more details.

28

(13)

VBUFF Integration resistor connection. Use a 47kΩ resistor for a 200mV full scale range and

a 47kΩ resistor for 2V full scale range.

29

(12)

CAZ The size of the auto-zero capacitor influences system noise. Use a 0.47µF capacitor

for 200mV full scale, and a 0.047µF capacitor for 2V full scale. See Section 7.1 on

Auto-Zero Capacitor for more details.

30

(11)

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

31

(10)

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

32

(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 8.3 on ANALOG COMMON for more

details.

33

(8)

CREF- See Pin 34.

34

(7)

CREF+ A 0.1µF capacitor is used in most applications. If a large Common mode voltage

exists (for example, the VIN- pin is not at analog common), and a 200mV scale is

used, a 1µF capacitor is recommended and will hold the rollover error to 0.5 count.

35

(6)

VREF- See Pin 36.

DS21455B-page 6

© 2002 Microchip Technology Inc.

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