STM8AL3188TCX datasheet(85/131 Pages) STMICROELECTRONICS

Part #	STM8AL3188TCX

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

PDF	131 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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85 / 131 page

DocID027179 Rev 6

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STM8AL318x STM8AL3L8x

Electrical parameters

117

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 STM8AL318x 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

()

STM8AL3188TCX Datasheet(PDF) 85 Page - STMicroelectronics