TC7135CBU(2002) 데이터 시트보기 (PDF) - Microchip Technology

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TC7135CBU
(Rev.:2002)

4-1/2 Digit A/D Converter

Microchip Technology 

TC7135

2.0 PIN DESCRIPTIONS

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

TABLE 2-1: PIN FUNCTION TABLE

Pin Number

28-Pin PDIP

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

Symbol

Description

V-

REF IN

ANALOG COMMON

INT OUT

AZ IN

BUFF OUT

CREF-

CREF+

-INPUT

+INPUT

V+

D5

B1

B2

B4

B8

D4

D3

D2

D1

BUSY

CLOCK IN

POLARITY

DGND

RUN/HOLD

STROBE

OVERRANGE

UNDERRANGE

Negative power supply input.

External reference input.

Reference point for REF IN.

Integrator output. Integrator capacitor connection.

Auto zero inpt. Auto-zero capacitor connection.

Analog input buffer output. Integrator resistor connection.

Reference capacitor input. Reference capacitor negative connection.

Reference capacitor input. Reference capacitor positive connection.

Analog input. Analog input negative connection.

Analog input. Analog input positive connection.

Positive power supply input.

Digit drive output. Most Significant Digit (MSD)

Binary Coded Decimal (BCD) output. Least Significant Bit (LSB)

BCD output.

BCD output.

BCD output. Most Significant Bit (MSB)

Digit drive output.

Digit drive output.

Digit drive output.

Digit drive output. Least Significant Digit (LSD)

Busy output. At the beginning of the signal-integration phase, BUSY goes High and

remains High until the first clock pulse after the integrator zero crossing.

Clock input. Conversion clock connection.

Polarity output. A positive input is indicated by a logic High output. The polarity output is

valid at the beginning of the reference integrate phase and remains valid until determined

during the next conversion.

Digital logic reference input.

Run / Hold input. When at a logic High, conversions are performed continuously. A logic

Low holds the current data as long as the Low condition exists.

Strobe output. The STROBE output pulses low in the center of the digit drive outputs.

Over range output. A logic High indicates that the analog input exceeds the full scale input

range.

Under range output. A logic High indicates that the analog input is less than 9% of the full

scale input range.

© 2002 Microchip Technology Inc.

DS21460B-page 5

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