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CST12.0MTWA 데이터시트(PDF) 120 Page - STMicroelectronics

부품명 CST12.0MTWA
상세설명  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
PDF  153 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

CST12.0MTWA 데이터시트(HTML) 120 Page - STMicroelectronics

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ST72334J/N, ST72314J/N, ST72124J
120/153
CLOCK CHARACTERISTICS (Cont’d)
16.5.4 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 70. Typical Application with RC oscillator
Figure 71. Typical Internal RC Oscillator
Figure 72. Typical External RC Oscillator
Notes:
1. Data based on characterization results.
2. Guaranteed frequency range with the specified CEX and REX ranges taking into account the device process variation.
Data based on design simulation.
3. Data based on characterization results done with VDD nominal at 5V, not tested in production.
4. REX must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used.
5. Important: when no external CEX 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
Typ
Max
Unit
fOSC
Internal RC oscillator frequency 1)
see Figure 71
3.60
5.10
MHz
External RC oscillator frequency 2)
114
tSU(OSC)
Internal RC Oscillator Start-up Time 3)
2.0
ms
External RC Oscillator Start-up Time 3)
REX=47KΩ, CEX=”0”pF
REX=47KΩ, CEX=100pF
REX=10KΩ, CEX=6.8pF
REX=10KΩ, CEX=470pF
1.0
6.5
0.7
3.0
REX
Oscillator external resistor 4)
see Figure 72
10
47
K
Ω
CEX
Oscillator external capacitor
0 5)
470
pF
OSC1
OSC2
fOSC
CEX
REX
EXTERNAL RC
INTERNAL RC
VREF
+
-
VDD
Current copy
Voltage generator
CEX discharge
ST72XXX
3.2
5.5
VDD [V]
3.8
3.9
4
4.1
4.2
4.3
fosc [MHz]
-40°C
+25°C
+85°C
+125°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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