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STM8AL3188TCX Datasheet(PDF) 84 Page - STMicroelectronics |
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STM8AL3188TCX Datasheet(HTML) 84 Page - STMicroelectronics |
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84 / 131 page  Electrical parameters STM8AL318x STM8AL3L8x 84/131 DocID027179 Rev 6 LSE external clock (LSEBYP=1 in CLK_ECKCR) The LSE is available on STM8AL318x devices only. Subject to general operating conditions for VDD and TA. HSE crystal/ceramic resonator oscillator The HSE clock can be supplied with a 1 to 16 MHz 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...). Table 31. LSE external clock characteristics Symbol Parameter Min. Typ. Max. Unit fLSE_ext External clock source frequency - 32.768 - kHz VLSEH OSC32_IN input pin high-level voltage 0.7xVDD(1) -VDD(1) V VLSEL OSC32_IN input pin low-level voltage VSS(1) 0.3xVDD(1) Cin(LSE) OSC32_IN input capacitance - 0.6 - pF ILEAK_LSE OSC32_IN input leakage current - - ±500 nA 1. Guaranteed by characterization results. Table 32. HSE oscillator characteristics Symbol Parameter Conditions Min. Typ. Max. Unit fHSE High speed external oscillator frequency -1 - 16 MHz RF Feedback resistor - - 200 - k Ω C(1)(2) Recommended load capacitance - - 20 - pF IDD(HSE) HSE oscillator power consumption C = 20 pF, fOSC = 16 MHz -- 2.5 (startup) 0.7 (stabilized)(3) mA C = 10 pF, fOSC =16 MHz -- 2.5 (startup) 0.46 (stabilized)(3) gm Oscillator transconductance - 3.5(3) -- mA/V tSU(HSE)(4) Startup time VDD is stabilized 1 - ms 1. C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD. 2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value. Refer to crystal manufacturer for more details 3. Guaranteed by design. 4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation. This value is measured for a standard crystal resonator and it varies significantly with the crystal manufacturer. |
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