參數(shù)資料
型號(hào)： μPD780208
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁(yè)數(shù)： 37/78頁(yè)
文件大?。?/td> 406K
代理商： ΜPD780208
3 7
m
PD780204, 780205, 780206, 780208
By placing the above conditions in calculation <1> to <3>, the total dissipation can be worked out.
<1> CPU power dissipation: 5.5 V
￥
21.6 mA = 118.8 mW
<2> Output pin power dissipation:
Grid
(V
DD
– V
OD
)
￥
Total current value of each grid
￥
Digit width (1 – Cut width)
= 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
= 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
= (5.5 V – 2 V – (–35 V))
2
￥
11 Grids
￥
(1 – 1 ) = 50.9 mW
25 k
W
11 Grids + 1 16
￥
The number of grids
￥
Digit width
The number of grids + 1
Segment
(V
OD
– V
LOAD
)
2
Pull-down resistor value
= (5.5 V – 0.4 V – (–35 V))
2
￥
31 dots
= 166.1 mW
25 k
W
11 Grids + 1
￥
The number of illuminated dots
The number of grids + 1
Total power dissipation = <1> + <2> + <3> = 118.8 + 25.8 + 3.1 + 50.9 + 166.1 = 364.7 mW
In this example, the total power dissipation do not exceed the rating of the total power dissipation, 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.
相關(guān)PDF資料
PDF描述
μPD780204 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD780205 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD78082 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD780973(A) 8 Bit Single Chip Microcontrollers
μPD780983 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD780308 制造商:NEC 制造商全稱:NEC 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER
PD780336GC-XXX-9EV 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
PD7-80-70A 制造商:MERRIMAC 制造商全稱:MERRIMAC 功能描述:0 , 75 ohm POWER DIVIDERS / COMBINERS
PD784054GCA2 制造商:NEC 制造商全稱:NEC 功能描述:16-BIT SINGLE-CHIP MICROCONTROLLER
PD784976A 制造商:NEC 制造商全稱:NEC 功能描述:16-Bit Single-Chip Microcontroller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*