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參數(shù)資料
| 型號(hào)： | EM78P451 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features; Temperature Range: 0°C to 70°C; Package: 16-QFN |
| 中文描述： | 8位微控制器的通用產(chǎn)品[英文] |
| 文件頁數(shù)： | 36/52頁 |
| 文件大?。?/td> | 1287K |
| 代理商： | EM78P451 |
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EM78P451
OTP ROM
This specification is subject to change without prior notice.
2002/03/01
41
OSCI
EM78P451
C
7404
330
XTAL
7404
Fig. 20 Circuit for Crystal/Resonator-Series Mode
OSCI
EM78P451
7404
4.7K
10K
XTAL
7404
C1
VDD
10K
C2
Fig. 21 Circuit for Crystal/Resonator-Parallel Mode
3. RC Oscillator Mode
For some applications that do not need a very precise timing calculation, the RC oscillator (Fig 22 &
Fig 23) offers a lot of cost savings. Nevertheless, it should be noted that the frequency of the RC
oscillator is influenced by the supply voltage, the values of the resistor (Rext), the capacitor (Cext),
and even by the operation temperature. Moreover, the frequency also changes slightly from one chip
to another due to the manufacturing process variation.
In order to maintain a stable system frequency, the values of the Cext should not be less than 20pF,
and that the value of Rext should not be greater than 1 M ohm. If they cannot be kept in this range, the
frequency is easily affected by noise, humidity, and leakage.
The smaller the Rext in the RC oscillator, the faster its frequency will be. On the contrary, for very low
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