參數(shù)資料
型號(hào)： ST72254G1B6
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
中文描述： 8位單電壓閃存微控制器。 ADC的。 16位定時(shí)器。的SPI。
文件頁數(shù)： 14/140頁
文件大小： 1349K
代理商： ST72254G1B6
ST72104G, ST72215G, ST72216G, ST72254G
110/140
CLOCK CHARACTERISTICS (Cont’d)
14.5.4 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 66. Typical Application with RC oscillator
Figure 67. Typical Internal RC Oscillator
Figure 68. 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 67
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=47K, CEX=”0”pF
REX=47K, CEX=100pF
REX=10K, CEX=6.8pF
REX=10K, CEX=470pF
1.0
6.5
0.7
3.0
REX
Oscillator external resistor 4)
see Figure 68
10
47
K
CEX
Oscillator external capacitor
0 5)
470
pF
OSC2
OSC1
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72254G1B6/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
ST72254G1B7 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
ST72254G1B7/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
ST72254G1M1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
ST72254G1M1/XXX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, IC INTERFACES
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