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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STM8S207MBT3B 데이터시트(PDF) 66 Page - STMicroelectronics |
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STM8S207MBT3B 데이터시트(HTML) 66 Page - STMicroelectronics |
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66 / 103 page  Electrical characteristics STM8S207xx, STM8S208xx 66/103 Doc ID 14733 Rev 9 Figure 17. HSE oscillator circuit diagram HSE oscillator critical gm formula Rm: Notional resistance (see crystal specification) Lm: Notional inductance (see crystal specification) Cm: Notional capacitance (see crystal specification) Co: Shunt capacitance (see crystal specification) CL1=CL2=C: Grounded external capacitance gm >> gmcrit Table 32. HSE oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE External high speed oscillator frequency 124 MHz RF Feedback resistor 220 k Ω C(1) Recommended load capacitance (2) 20 pF IDD(HSE) HSE oscillator power consumption C = 20 pF, fOSC = 24 MHz 6 (startup) 2 (stabilized)(3) mA C = 10 pF, fOSC = 24 MHz 6 (startup) 1.5 (stabilized)(3) gm Oscillator transconductance 5 mA/V tSU(HSE) (4) Startup time VDD is stabilized 1 ms 1. C 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. Data based on characterization results, not tested in production. 4. tSU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 24 MHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. OSCOUT OSCIN fHSE to core CL1 CL2 RF STM8 Resonator Consumption control gm Rm Cm Lm CO Resonator g mcrit 2 Π × f HSE × ()2 R m × 2Co C + () 2 = |
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