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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM8AF6213 датащи(PDF) 68 Page - STMicroelectronics |
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STM8AF6213 датащи(HTML) 68 Page - STMicroelectronics |
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68 / 106 page  Electrical characteristics STM8AF6213/23/23A/26 68/106 DocID025118 Rev 5 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...). Figure 18. HSE oscillator circuit diagram Table 40. HSE oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE External high-speed oscillator frequency -1 - 16 MHz RF Feedback resistor - - 220 - k C(1) Recommended load capacitance(2) -- - 20 pF IDD(HSE) HSE oscillator power consumption C = 20 pF, fOSC = 16 MHz -- 6 (startup) 1.6 (stabilized)(3) mA C = 10 pF, fOSC = 16 MHz -- 6 (startup) 1.2 (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 the crystal manufacturer for more details. 3. Data based on characterization results, not tested in production. 4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) until a stabilized 16 MHz oscillation is reached. The value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. |
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