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STM8AF6346ITD bảng dữ liệu(PDF) 58 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Automotive 8-bit MCU, with up to 32-Kbyte Flash memory, data EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 to 5.5 V
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM8AF6346ITD bảng dữ liệu(HTML) 58 Page - STMicroelectronics

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Electrical characteristics
STM8AF6366
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DS12343 Rev 2
Figure 16. HSE external clock source
HSE crystal/ceramic resonator oscillator
The HSE clock can be supplied using a crystal/ceramic resonator oscillator of up to 16 MHz.
All the information given in this paragraph is based on characterization results with specified
typical external components. In the application, the resonator and the load capacitors have
to be placed as close as possible to the oscillator pins in order to minimize output distortion
and startup stabilization time. Refer to the crystal resonator manufacturer for more details
(frequency, package, accuracy...).
V
HSEH
V HSEL
External clock
source
OSCIN
fHSE
STM8
MS36489V1
Table 29. HSE oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RF
Feedback resistor
-
-
220
-
k
Ω
CL1/CL2(1) Recommended load capacitance
-
-
-
20
pF
gm
Oscillator transconductance
-
5
-
-
mA/V
tSU(HSE)(2) Startup time
VDD is
stabilized
-2.8
-
ms
1. The oscillator needs two load capacitors, CL1 and CL2, to act as load for the crystal. The total load capacitance (Cload) is
(CL1 * CL2)/(CL1 + CL2). If CL1 = CL2, Cload = CL1 / 2. Some oscillators have built-in load capacitors, CL1 and CL2.
2. This value is the startup time, measured from the moment it is enabled (by software) until a stabilized 16 MHz oscillation is
reached. It can vary with the crystal type that is used.



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