TC7106A datasheet(18/32 Pages) MICROCHIP

Il numero della parte	TC7106A

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

PDF	32 Pages

Scroll/Zoom	100%

Produttore elettronici	MICROCHIP [Microchip Technology]

Homepage	http://www.microchip.com

Logo

18 / 32 page

TC7106/A/TC7107/A

DS21455C-page 18

In addition to limiting maximum power dissipation, the

resistor reduces the change in power dissipation as the

display changes. This effect is caused by the fact that,

as fewer segments are “ON,” each “ON” output drops

more voltage and current. For the best case of six seg-

ments (a “111” display) to worst-case (a “1888”

display), the resistor will change about 230mW, while a

circuit without the resistor will change about 470mW.

Therefore, the resistor will reduce the effect of display

dissipation on reference voltage drift by about 50%.

The change in LED brightness caused by the resistor is

almost unnoticeable as more segments turn off. If

display brightness remaining steady is very important

to the designer, a diode may be used instead of the

resistor.

FIGURE 9-4:

Diode or Resistor Limits

Package Power Dissipation

TP2

TP5

100

TP1

24k

0.1

μF

TP3

0.01

μF

–

0.22

μF

Display

100

+5V

-5V

150

0.47

μF

TC7107A

1N4001

5.1

Ω 1/4W

TC7106A Scheda tecnica(PDF) 18 Page - Microchip Technology

TC7106A Scheda tecnica(HTML) 18 Page - Microchip Technology

Html Pages

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

Scheda tecnica Scarica

Link URL