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參數(shù)資料
| 型號： | UPD780824 |
| 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 |
| 文件頁數(shù)： | 29/52頁 |
| 文件大?。?/td> | 345K |
| 代理商： | UPD780824 |
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29
μ
PD780232
Data Sheet U13415EJ2V0DS
Notes 2.
The allowable total power dissipation differs depending on the temperature (see the following figure).
How to calculate total power dissipation
The power consumption of the
μ
PD780232 can be divided to the following three types. The sum of the three power
consumption types should be less than the total power dissipation P
T
(80% or less of ratings is recommended).
<1>
CPU power consumption: Calculate V
DD
(MAX.)
×
I
DD
(MAX.).
<2>
Output pin power consumption: Power consumption when maximum current flows to VFD output pins.
<3>
Pull-down resistor power consumption: Power consumption by the pull-down resistors incorporated in the VFD
output pins by a mask option.
The following shows how to calculate total power consumption for the example in Figure 11-1.
Example
Assume the following conditions:
V
DD
= 5.5 V, 5.0 MHz oscillation
Supply current (I
DD
) = 21.0 mA
VFD output:
11 grids
×
10 segments (blanking width = 1/16)
The maximum current at the grid pin is 15 mA.
The maximum current at the segment pin is 5 mA.
At the key scan timing, the VFD output pin is OFF.
VFD output voltage:
Grids
V
OD
= V
DD
– 2 V (voltage drop of 2 V)
Segments V
OD
= V
DD
– 0.5 V (voltage drop of 0.5 V)
Fluorescent display control voltage (V
LOAD
) = –35 V
Mask option pull-down resistor = 35 k
+80
+40
0
–
40
800
600
500
400
200
Temperature [
C]
+85
T
T
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