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STM8AF6348IUC Datasheet(PDF) 59 Page - STMicroelectronics

Part # STM8AF6348IUC
Description  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
PDF  95 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8AF6348IUC Datasheet(HTML) 59 Page - STMicroelectronics

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DS12343 Rev 2
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STM8AF6366
Electrical characteristics
93
Figure 17. HSE oscillator circuit diagram
HSE oscillator critical gm formula
The crystal characteristics have to be checked with the following formula:
gm gmcrit
»
where gmcrit can be calculated with the crystal parameters as follows:
gmcrit
2
Π
×
HSE
f
×
()
2
Rm
×
2Co C
+
()
2
=
Rm: Notional resistance (see crystal specification)
Lm: Notional inductance (see crystal specification)
Cm: Notional capacitance (see crystal specification)
Co: Shunt capacitance (see crystal specification)
CL1 = CL2 = C: Grounded external capacitance
MSv37799V1
OSCOUT
OSCIN
fHSE to core
CL1
RF
STM8
Resonator
Current control
gm
Rm
Cm
Lm
Resonator
CL2
CO



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