參數(shù)資料
型號(hào): ST72C171
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP
中文描述: 8位8K閃存,ADC的,水分散粒劑,SPI和脊髓損傷,定時(shí)器SPGAs軟件可編程增益放大器,運(yùn)算放大器控制器
文件頁(yè)數(shù): 120/152頁(yè)
文件大小: 1384K
代理商: ST72C171
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ST72C171
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CLOCK AND TIMING CHARACTERISTICS
(Cont’d)
9.5.3 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 componants. 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...).
Figure 68. Typical Application with a Crystal or Ceramic Resonator
Notes:
1. Resonator characteristics given by the crystal/ceramic resonator 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/ceramic resonator manufacturer for more details.
Symbol
Parameter
Conditions
Min
1
>2
>4
>8
20
38
32
18
15
40
50
100
250
Max
2
4
8
16
40
56
46
26
21
130
300
550
820
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
Recommanded load capacitances 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
Oscil.
Typical Crystal or Ceramic Resonators
Freq.
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
2MHz
f
OSC
=[±0.5%
tolerance
,±0.3%
Ta
,
±0.3%
aging
,
±x.x%
correl
] 33
4MHz
f
OSC
=[±0.5%
tolerance
,±0.3%
Ta
,
±0.3%
aging
,
±x.x%
correl
] 33
8MHz
f
OSC
=[±0.5%
tolerance
,±0.5%
Ta
,
±0.3%
aging
,
±x.x%
correl
] 33
16MHz
f
OSC
=[±0.5%
tolerance
,±0.3%
Ta
,
±0.3%
aging
,
±x.x%
correl
] 33
C
L1
[pF]
33
33
33
33
C
L2
[pF]
34
34
34
34
30
30
30
30
t
SU(osc)
[ms]
2)
Reference
S-200-30-30/50
SS3-400-30-30/30
SS3-800-30-30/30
SS3-1600-30-30/30
CSA2.00MG
CSA4.00MG
CSA8.00MTZ
CSA16.00MXZ040
Characteristic
1)
C
LP
MP
MS
HS
J
10~15
7~10
2.5~3
1~1.5
4.2
2.1
1.1
0.7
C
LP
M
MP
MS
HS
OSC2
OSC1
f
OSC
C
L1
C
L2
i
2
R
F
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
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