參數(shù)資料
型號： 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，定時器SPGAs軟件可編程增益放大器，運算放大器控制器
文件頁數(shù)： 121/152頁
文件大?。?/td> 1384K
代理商： ST72C171
ST72C171
121/152
CLOCK CHARACTERISTICS
(Cont’d)
9.5.4 RC Oscillators
The ST7 internal clock can be supplied with an RC
oscillator. This oscillator can be used with internal
or external components (selectable by option
byte).
Figure 69. Typical Application with RC oscillator
Figure 70. Typical Internal RC Oscillator
Figure 71. Typical External RC Oscillator
Notes:
1. Data based on characterization results.
2. Guaranteed frequency range with the specified C
EX
and R
EX
ranges taking into account the device process variation.
Data based on design simulation.
3. Data based on characterization results done with V
DD
nominal at 5V, not tested in production.
4. R
EX
must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used.
5.
Important:
when no external C
is applied, the capacitance to be considered is the global parasitic capacitance which
is subject to high variation (package, application...). In this case, the RC oscillator frequency tuning has to be done by
trying out several resistor values.
Symbol
Parameter
Conditions
Min
3.60
1
Typ
Max
5.10
14
Unit
f
OSC
Internal RC oscillator frequency
1)
External RC oscillator frequency
2)
Internal RC Oscillator Start-up Time
3)
see
Figure 69
MHz
t
SU(OSC)
2.0
1.0
6.5
0.7
3.0
ms
External RC Oscillator Start-up Time
3)
R
EX
=47K
,
C
EX
=”0”pF
R
EX
=47K
,
C
EX
=100pF
R
EX
=10K
,
C
EX
=6.8pF
R
EX
=10K
,
C
EX
=470pF
R
EX
C
EX
Oscillator external resistor
4)
Oscillator external capacitor
see
Figure 70
10
0
5)
47
470
K
pF
OSC2
OSC1
f
OSC
C
EX
R
EX
EXTERNAL RC
INTERNAL RC
V
REF
+
-
V
DD
Current copy
Voltage generator
C
EX
discharge
ST72XXX
3.2
5.5
VDD [V]
3.85
3.9
3.95
4
4.05
4.1
4.15
4.2
4.25
fosc [MHz]
-40°C
+25°C
+85°C
0
6.8
22
47
100
270
470
Cex [pF]
0
5
10
15
20
fosc [MHz]
Rex=10KOhm
Rex=15KOhm
Rex=22KOhm
Rex=33KOhm
Rex=39KOhm
Rex=47KOhm
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