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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)： | 30/72頁 |
| 文件大小： | 387K |
| 代理商： | ΜPD78P048A |
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m
PD78P048A
30
Notes 2.
Total power dissipation differs depending on the temperature (refer to the following figure).
+80
+40
0
–40
800
600
400
200
Temperature [C]
T
T
How to calculate total power dissipation
The following three power dissipation are available for the
m
PD78P048A. The sum of the three power dissipation
should be less than the total power dissipation P
T
(80 % or less of ratings is recommended).
<1> CPU power dissipation: calculate V
DD
(MAX.)
￥
I
DD
(MAX.).
<2> Output pin power dissipation: Power dissipation when maximum current flows into display output pin.
<3> Pull-down resistor power dissipation: Power dissipation by pull-down resistor incorporated in display output
pin by mask option.
The following is how to calculate total power dissipation for the example in Figure 9-1.
Example
Assume the following conditions:
V
DD
= 5 V ± 10 %, 5.0 MHz oscillator
Supply current (I
DD
) = 21.6 mA
Display output: 11 grids
￥
10 segments (Cut width = 1/16)
Maximum current at the grid pin is 15 mA.
Maximum current at the segment pin is 3 mA.
At the key scan timing, display output pin is OFF.
Display output voltage: grid
segments V
OD
= V
DD
– 0.4 V (voltage drop of 0.4 V)
Fluorescent display control voltage (V
LOAD
) = –30 V
Mask option pull-down resistor = 25 k
W
V
OD
= V
DD
– 2 V (voltage drop of 2 V)
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
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