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STM8L151C2 Datasheet(PDF) 74 Page - STMicroelectronics |
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STM8L151C2 Datasheet(HTML) 74 Page - STMicroelectronics |
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74 / 123 page  Electrical parameters STM8L151x2, STM8L151x3 74/123 DS7204 Rev 11 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 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...). Table 31. LSE oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit fLSE Low speed external oscillator frequency - - 32.768 - kHz RF Feedback resistor ΔV = 200 mV - 1.2 - M Ω C(1) 1. C=CL1=CL2 is approximately equivalent to 2 x crystal CLOAD. Recommended load capacitance (2) 2. The oscillator selection can be optimized in terms of supply current using a high quality resonator with a small Rm value. Refer to crystal manufacturer for more details. -- 8 - pF IDD(LSE) LSE oscillator power consumption -- - 1.4(3) 3. Guaranteed by design. µA VDD = 1.8 V - 450 - nA VDD = 3 V - 600 - VDD = 3.6 V - 750 - gm Oscillator transconductance - 3(3) -- µA/V tSU(LSE) (4) 4. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. Startup time VDD is stabilized - 1 - s g mcrit 2 Π × f HSE × ()2 R m × 2Co C + () 2 = |
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