STM8AL3LE8x datasheet(87/133 Pages) STMICROELECTRONICS

Part #	STM8AL3LE8x

Description	Automotive 8-bit ultra-low-power MCU, 64 KB Flash, EEPROM, RTC, AES, LCD, timers, USARTs, I2C, SPIs, ADC, DAC, COMPs

PDF	133 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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87 / 133 page

DocID027180 Rev 5

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STM8AL31E8x STM8AL3LE8x

Electrical parameters

119

Figure 21. HSE oscillator circuit diagram

HSE oscillator critical gm formula

Rm: Motional resistance (see crystal specification), Lm: Motional inductance (see crystal specification),

Cm: Motional capacitance (see crystal specification), Co: Shunt capacitance (see crystal specification),

CL1=CL2=C: Grounded external capacitance

gm >> gmcrit

LSE crystal/ceramic resonator oscillator

The LSE is available on STM8AL31E8x devices only.

The LSE clock can be supplied with a 32.768 kHz crystal/ceramic resonator oscillator. 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...).

gmcrit

fHSE

()2 Rm

2Co C

()

STM8AL3LE8x Datasheet(PDF) 87 Page - STMicroelectronics