參數(shù)資料
型號： ST72C254G2E0
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?。?/td> 1349K
代理商： ST72C254G2E0
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
ST72C254G2M3 功能描述:8位微控制器 -MCU ST72104G ST72215G ST72254G 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72C254G2M3/TR 功能描述:8位微控制器 -MCU 8B MCU SINGLE VLTG FLASH MEMORY RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72C254G2M6 功能描述:8位微控制器 -MCU Flash 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72C254G2M6 制造商:STMicroelectronics 功能描述:8BIT MCU FLASH 8K 72C254 SOIC28
ST72C254G2M6/TR 制造商:ST 功能描述:0
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