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&degC 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): 37/52頁
文件大?。?/td> 1287K
代理商: EM78P451
EM78P451
OTP ROM
This specification is subject to change without prior notice.
2002/03/01
42
Rext values, for instance, 1 K
, the oscillator becomes unstable because the NMOS cannot
discharge the current of the capacitance correctly.
Based on the reasons above, it must be kept in mind that all of the supply voltage, the operation
temperature, the components of the RC oscillator, the package types, the way the PCB is layout, will
affect the system frequency.
OSCI
EM78P451
VCC
Rext
Cext
Fig. 22 Circuit for External RC Oscillator Mode
OSCI
EM78P451
VCC
Rext
Fig. 23 Circuit for External R, Internal C Oscillator Mode
Calibrate frequency of External RC oscillator (For reference only)
C ext
R ext
Fosc @5.0V,25J
3.3K
3.4MHz
5.1K
2.2MHz
10K
1.3MHz
20pF
100K
144KHz
3.3K
1.39MHz
5.1K
935KHz
10K
500KHz
100pF
100K
54.5KHz
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