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STM32F101X6 数据表(PDF) 42 Page - STMicroelectronics |
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STM32F101X6 数据表(HTML) 42 Page - STMicroelectronics |
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42 / 74 page  Electrical characteristics STM32F101xx 42/74 Figure 19. Typical application with an 8 MHz crystal 1. REXT value depends on the crystal characteristics. Typical value is in the range of 5 to 6RS. Low-speed external clock The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on characterization results obtained with typical external components specified in Table 22. 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 on the resonator characteristics (frequency, package, accuracy). Figure 20. Typical application with a 32.768 kHz crystal Table 22. LSE oscillator characteristics (fLSE = 32.768 kHz) Symbol Parameter Conditions Min Typ Max Unit RF Feedback resistor 5 M Ω CL1 CL2 Recommended load capacitance versus equivalent serial resistance of the crystal (RS) (1) 1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value for example MSIV-TIN32.768 kHz. Refer to crystal manufacturer for more details RS = 30 KΩ 15 pF I2 LSE driving current VDD = 3.3 V VIN = VSS 1.4 µA gm Oscillator transconductance 5 µA/V tSU(LSE) (2) 2. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer Startup time VDD is stabilized 3 s ai14128 OSC_OU T OSC_IN fHSE CL1 RF STM32F101xx 8 MH z resonator RESONATOR WITH IN TEGRATED CAPAC ITORS Bias controlled gain REXT(1) CL2 ai14129 OSC32_OU T OSC32_IN fLSE CL1 RF STM32F101xx 32.768 KH z resonator RESONATOR WITH IN TEGRATED CAPAC ITORS Bias controlled gain CL2 |
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