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參數(shù)資料
| 型號： | UPD6604 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 4位單片機(jī)的紅外遙控傳輸 |
| 文件頁數(shù)： | 30/64頁 |
| 文件大?。?/td> | 268K |
| 代理商： | UPD6604 |
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30
μ
PD6604
Data Sheet U11281EJ3V0DS00
Remark
Theoretically, the oscillation frequency of the system clock is determined by the values of C and R.
Actually, however, it also changes depending on supply voltage V
DD
and operating ambient temperature
T
A
. Moreover, the oscillation frequency of some devices differs from that of the others even when R and
C of the same values are connected because of variations in the devices and wiring of the set board.
It is therefore difficult to accurately calculate the values of the oscillation frequency and R.
However, an approximate value can be obtained by an approximate calculation (such as an expression
calculating the value of R from the f
OSC
value) using data measured under fixed conditions.
The expression shown below was obtained experimentally. This can be used to calculate the resistor
R necessary to obtain the oscillation frequency f
OSC
under the conditions of C = 27 pF, V
DD
= 3.0 V,
and T
A
= 25
°
C.
R =
26400
f
OSC
[kHz]
– 2.40 [k
] (Where V
DD
= 3.0 V, and T
A
= 25
°
C, and C = 27 pF)
Example of f
OSC
vs R characteristics (Reference)
O
O
Oscillation resistance R [k
]
1000
300
100
(C = 27 pF, V
DD
= 3.0 V, and T
A
= 25
°
C)
10
20
30
50
70
80
100
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