參數(shù)資料
型號(hào)： UPD780232
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述： 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁(yè)數(shù)： 30/52頁(yè)
文件大?。?/td> 345K
代理商： UPD780232
30
μ
PD780232
Data Sheet U13415EJ2V0DS
By placing the above conditions in calculations <1> to <3>, the total dissipation can be calculated.
<1> CPU power consumption: 5.5 V
×
21.0 mA = 115.5 mW
<2> Output pin power consumption:
Grid
(V
DD
–
V
)
×
Total current value of each grid
×
(1
–
Blanking width)
Number of grids + 1
= 2 V
×
15 mA
×
11 grids
×
(1
–
1 ) = 25.8 mW
11 grids + 1 16
Segment
(V
DD
–
V
)
×
Total segment current value of illuminated dots
×
(1
–
Blanking width)
Number of grids +1
= 0.5 V
×
5 mA
×
31 dots
×
(1
–
1 ) = 6.1 mW
11 grids + 1 16
<3> Pull-down resistor power consumption:
Grid
(V
OD
–
V
LOAD
)
2
Pull-down resistor value Number of grids + 1
×
Number of grids
×
(1
–
Blanking width)
=
(5.5 V
–
2 V
–
(
–
35 V))
2
×
11 grids
×
(1
–
1 ) = 36.4 mW
35 k
11 grids + 1 16
Segment
(V
OD
–
V
LOAD
)
2
Pull-down resistor value
×
Number of illuminated dots
×
(1
–
Blanking width)
Number of grids + 1
=
35 k
11 grids + 1 16
(5.5 V
–
0.5 V
–
(
–
35 V))
2
×
31 dots
×
(1
–
1 ) = 110.7 mW
Total power consumption = <1> + <2> + <3> = 115.5 + 25.8 + 6.1 + 36.4 + 110.7 = 294.5 mW
In this example, the total power consumption does not exceed the rating of the allowable total power dissipation,
so there is no problem in the power consumption.
However, when the total power consumption exceeds the rating of the total power dissipation, it is necessary to
lower the power consumption. To reduce the power consumption, reduce the number of pull-down resistors.
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