TC7106A datasheet(19/32 Pages) MICROCHIP

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DS21455C-page 19

TC7106/A/TC7107/A

10.0

TYPICAL APPLICATIONS

10.1

Liquid Crystal Display Sources

Several manufacturers supply standard LCDs to inter-

face with the TC7106A 3-1/2 digit analog-to-digital

converter.

Note:

Contact LCD manufacturer for full product listing

and specifications.

10.2

Light Emitting Diode Display

Sources

Several LED manufacturers supply seven segment

digits with and without decimal point annunciators for

the TC7107A.

10.3

Decimal Point and Annunciator

Drive

The TEST pin is connected to the internally generated

digital logic supply ground through a 500

Ω resistor. The

TEST pin may be used as the negative supply for exter-

nal CMOS gate segment drivers. LCD display annunci-

ators for decimal points, low battery indication, or

function indication may be added without adding an

additional supply. No more than 1mA should be

supplied by the TEST pin; its potential is approximately

5V below V+ (see Figure

FIGURE 10-1:

Decimal Point Drive Using

Test as Logic Ground

10.4

Ratiometric Resistance

Measurements

The true differential input and differential reference

make ratiometric reading possible. Typically in a ratio-

metric operation, an unknown resistance is measured,

with respect to a known standard resistance. No

accurately defined reference voltage is needed.

The unknown resistance is put in series with a known

standard and a current passed through the pair. The

voltage developed across the unknown is applied to the

input and the voltage across the known resistor is

applied to the reference input. If the unknown equals

the standard, the display will read 1000.

The displayed reading can be determined from the

following expression:

The display will over range for:

RUNKNOWN ≥ 2 x RSTANDARD

Manufacturer

Address/Phone

Representative

Part Numbers*

Crystaloid

Electronics

5282 Hudson Dr.

Hudson, OH 44236

216-655-2429

C5335, H5535,

T5135, SX440

AND

720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

FE 0201, 0701

FE 0203, 0701

FE 0501

Epson

3415 Kashikawa st.

Torrance, CA 90505

213-534-0360

LD-B709BZ

LD-H7992AZ

Hamlin, Inc.

612 E. Lake St.

Lake Mills, WI 53551

414-648-236100

3902, 3933, 3903

Manufacturer

Address/Phone

Display

Hewlett-Packard

Components

640 Page Mill Rd.

Palo Alto, CA 94304

LED

AND

720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

LED

TC7106A

TEST

V+

GND

To LCD

Decimal

Point

To LCD

Decimal

Point

To LCD

Backplane

4049

TC7106A

Decimal

Point

Select

V+

TEST

GND

4030

Displayed Reading

()

RUnknown

dard

tan

-------------------------------x1000

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