參數(shù)資料
型號: TC7117ACPI
元件分類: ADC
英文描述: 1-CH DUAL-SLOPE ADC, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 10/32頁
文件大?。?/td> 515K
代理商: TC7117ACPI
TC7106/A/TC7107/A
DS21455C-page 18
2006 Microchip Technology Inc.
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
k
Ω
TP1
24k
Ω
1k
Ω
0.1
μF
TP3
0.01
μF
+
IN
0.22
μF
Display
100
pF
+5V
1M
Ω
-5V
150
Ω
0.47
μF
TC7107A
40
TP
4
30
21
20
10
1
47
k
Ω
1N4001
5.1
Ω 1/4W
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