TC7135CPL datasheet(5/24 Pages) MICROCHIP

5 / 24 page

 2004 Microchip Technology Inc.

DS21460C-page 5

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,

28-Pin PLCC

Pin Number

44-Pin MQFP*

Pin Number

64-Pin MQFP*

Symbol

Description

V–

Negative power supply input.

REF IN

External reference input.

ANALOG COMMON

Reference point for REF IN.

INT OUT

Integrator output. Integrator capacitor connection.

AZ IN

Auto-zero inpt. Auto-zero capacitor connection.

BUFF OUT

Analog input buffer output. Integrator resistor

connection.

CREF–

Reference capacitor input. Reference capacitor

negative connection.

CREF+

Reference capacitor input. Reference capacitor

positive connection.

–INPUT

Analog input. Analog input negative connection.

+INPUT

Analog input. Analog input positive connection.

V+

Positive power supply input.

Digit drive output. Most Significant Digit (MSD)

Binary Coded Decimal (BCD) output. Least Significant

bit (LSb).

BCD output.

BCD output. Most Significant bit (MSb).

Digit drive output.

Digit drive output. Least Significant Digit (LSD).

BUSY

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 IN

Clock input. Conversion clock connection.

POLARITY

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.

DGND

Digital logic reference input.

RUN/HOLD

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

Strobe output. The STROBE output pulses low in the

center of the digit drive outputs.

OVERRANGE

Overrange output. A logic high indicates that the

analog input exceeds the full-scale input range.

UNDERRANGE

Underrange output. A logic high indicates that the

analog input is less than 9% of the full-scale input

range.

* Pins not identified or documented are NC (no connects).

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