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STM8L152C8 Datasheet(PDF) 90 Page - STMicroelectronics |
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STM8L152C8 Datasheet(HTML) 90 Page - STMicroelectronics |
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90 / 134 page  Electrical parameters STM8L15xx8, STM8L15xR6 90/134 DocID17943 Rev 6 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 STM8L151xx and STM8L152xx 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...). OSC_OUT OSC_IN fHSE to core CL1 L2 RF STM8 Resonator Consumption control gm Rm Cm Lm CO Resonator gmcrit 2 Π × fHSE × ()2 Rm × 2Co C + () 2 = Table 32. 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)(2) Recommended load capacitance 8 pF IDD(LSE) LSE oscillator power consumption 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) Startup time VDD is stabilized 1 s 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 a small Rm value. Refer to crystal manufacturer for more details. 3. Guaranteed by design. Not tested in production. |
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