參數(shù)資料
型號： μPD78P048A
廠商： NEC Corp.
英文描述： 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述： 8位單片機(jī)微控制器（8位單片微控制器）
文件頁數(shù)： 31/72頁
文件大?。?/td> 387K
代理商： ΜPD78P048A
m
PD78P048A
31
<2> Output pin power dissipation:
Grid
(V
DD
– V
OD
)
￥
Total current value of each grid
￥
Digit width (1 – Cut width)
The number of grids + 1
= 2 V
￥
15 mA
￥
11 Grids
￥
(1 – 1 ) = 25.8 mW
11 Grids + 1
16
Segment (V
DD
– V
OD
)
￥
Total segment current value of illuminated dots
The number of grids +1
= 0.4 V
￥
3 mA
￥
31 Dots = 3.1 mW
11 Grids + 1
<3> Pull-down resistor power dissipation:
Grid
(V
OD
– V
LOAD
)
2
Pull-down resistor value The number of grids + 1
= (5.5 V – 2 V – (–30 V))
2
￥
11 Grids
￥
(1 – 1 ) = 38.6 mW
25 k
W
11 Grids + 1 16
￥
The number of grids
￥
Digit width
Segment
(V
OD
– V
LOAD
)
2
Pull-down resistor value The number of grids + 1
= (5.5 V – 0.4 V – (–30 V))
2
￥
31 dots
= 127.3 mW
25 k
W
11 Grids + 1
￥
The number of illuminated dots
Total power dissipation = <1> + <2> + <3> = 118.8 + 25.8 + 3.1 + 38.6 + 127.3 = 313.6 mW
In this example, the total power dissipation do not exceed the rating of the total power dissipation shown
in the figure above, so there is no problem in power dissipation.
However, when the total power dissipation exceeds the rating of the total power dissipation, it is necessary
to lower the power dissipation. To reduce power dissipation, reduce the number of pull-down resistor.
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