參數(shù)資料
型號: μPD780205
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): 36/78頁
文件大?。?/td> 406K
代理商: ΜPD780205
3 6
m
PD780204, 780205, 780206, 780208
Notes 3.
Total power dissipation differs depending on the temperature (see 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
PD780204, 780205, 780206, and 780208. 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>
<2>
CPU power dissipation: calculate V
DD
(MAX.)
I
DD1
(MAX.).
Output pin power dissipation: Normal output and display output are available. Power dissipation when maximum
current flows into each output.
Pull-down resistor power dissipation: Power dissipation by pull-down resistor incorporated in display output pin
by mask option.
<3>
The following is how to calculate total power dissipation for the example in the next page.
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
V
OD
= V
DD
– 2 V (voltage drop of 2 V)
segments V
OD
= V
DD
– 0.4 V (voltage drop of 0.4 V)
Fluorescent display control voltage (V
LOAD
) = –35 V
Mask option pull-down resistor = 25 k
W
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