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| 型号： | C166 |
| 厂商： | SIEMENS AG |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件页数： | 9/45页 |
| 文件大小： | 654K |
| 代理商： | C166 |
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AP242005 07.99
Crystal Oscillators of the
C500 / C166 Microcontroller Family
4
Oscillator Start-up Time
Based on small electrical system noise or thermic noise caused by resistors, the oscillation starts
with a very small amplitude. Due to the amplification of the oscillator-inverter, the oscillation
amplitude increases and reaches its maximum after a certain time period t
st_up
(start-up time). The
oscillator start-up time depends on the oscillator frequency and typical values of the start-up time
are within the range of 0.1 msec
≤
t
st_up
≤
10 msec for an oscillator frequency
2 MHz
≤
f
OSC
≤
40 MHz. The oscillator frequency of the real time clock oscillator are within the
range of 32kHz
±
50% and typical values of the start-up time are within the range of
1 sec
≤
t
st_up
≤
10 sec.
Theoretically the oscillator-inverter performs a phase shift of 180°, and the external circuitry
performs a phase shift of 180° to fulfill the oscillation condition of an oscillator. A total phase shift of
360° is necessary.
In reality, the real phase shift of the oscillator-inverter depends on the oscillator frequency and is
approximately in the range of 100° to 210°. It is necessary to compose the external components in
a way that a total phase shift of 360° is performed. This can be achieved by a variation of C
x1
and
C
x2
.
Note: During power-on the external hardware reset signal has to be active for a longer time period
than the oscillator start-up time in order to prevent undefined effects.
Note: Because of the different gain of the Type_R oscillator-inverter during reset active and reset
inactive it is recommended to consider the oscillation in both phases of the reset signal.
4.1
Definition of the Oscillator Start-up Time t
st_up
The definition of the oscillator start-up time is not a well defined value in literature. Generally it
depends on the power supply rise time dV
DD
/dt at power on, on the electrical system noise and on
the oscillation amplitude. For this application the oscillator start-up time t
st_up
is defined from V
DD
/
2 to 0.9*V
OSC_max
of the stable oscillation, see figure 2.
Figure 2
Oscillator Start-up Time
V
DD
t
st_up
Supply Voltage at
XTAL2 Output
t
V
DD
/2
0.9*V
OSC_max
V
OSC_max
Signal at
XTAL2 Output
相关PDF资料 |
PDF描述 |
|---|---|
| C1676 | Approved for use with GlobeSpan HDSL2 Chip Set Meets the requirements of IEC60950 for supplementary insulation, 250V working voltage |
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| C167CR-16RM | 16-Bit CMOS Single-Chip Microcontrollers |
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| C167CS-4R | BOARD INTERFACE KGZ/GMS 0-100% |
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