參數(shù)資料
型號： ST72124J2T
廠商： 意法半導(dǎo)體
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
中文描述： 8位單電壓閃存，ADC和16位定時器，SPI和脊髓損傷界面微控制器
文件頁數(shù)： 117/153頁
文件大小： 1533K
代理商： ST72124J2T
ST72334J/N, ST72314J/N, ST72124J
117/153
CLOCK AND TIMING CHARACTERISTICS
(Cont’d)
16.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph are based
on characterization results with specified typical
external components. In the application, the reso-
nator and the load capacitors have to be placed as
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
16.5.3.1 Typical Crystal Resonators
Figure 68. Application with a Crystal Resonator
Notes:
1. Resonator characteristics given by the crystal manufacturer.
2.
t
is the typical oscillator start-up time measured between V
DD
=2.8V and the fetch of the first instruction (with a
quick V
DD
ramp-up from 0 to 5V (<50
μ
s).
3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
S
value.
Refer to crystal manufacturer for more details.
Symbol
Parameter
Conditions
Min
1
>2
>4
>8
20
38
32
18
15
40
110
180
400
Max
2
4
8
16
40
56
46
26
21
100
190
360
700
Unit
f
OSC
Oscillator Frequency
3)
LP: Low power oscillator
MP: Medium power oscillator
MS: Medium speed oscillator
HS: High speed oscillator
MHz
R
F
Feedback resistor
k
C
L1
C
L2
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (R
S
)
R
S
=200
R
S
=200
R
S
=200
R
S
=100
V
DD
=5V
V
IN
=V
SS
LP oscillator
MP oscillator
MS oscillator
HS oscillator
LP oscillator
MP oscillator
MS oscillator
HS oscillator
pF
i
2
OSC2 driving current
μ
A
Option
Byte
Config.
LP
MP
MS
HS
Reference
Freq.
Characteristic
1)
C
L1
[pF]
C
L2
[pF]
t
SU(osc)
[ms]
2)
J
S-200-30-30/50
SS3-400-30-30/30
SS3-800-30-30/30
SS3-1600-30-30/30
2MHz
f
OSC
=[±30ppm
25°C
,±30ppm
Ta
]
, Typ. R
S
=200
4MHz
f
OSC
=[±30ppm
25°C
,±30ppm
Ta
]
, Typ. R
S
=60
8MHz
f
OSC
=[±30ppm
25°C
,±30ppm
Ta
]
, Typ. R
S
=25
16MHz
f
OSC
=[±30ppm
25°C
,±30ppm
Ta
]
, Typ. R
S
=15
33
33
33
33
34
34
34
34
10~15
7~10
2.5~3
1~1.5
OSC2
OSC1
f
OSC
C
L1
C
L2
i
2
R
F
ST72XXX
RESONATOR
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