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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32WB15CC датащи(PDF) 87 Page - STMicroelectronics |
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STM32WB15CC датащи(HTML) 87 Page - STMicroelectronics |
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87 / 127 page  DS13258 Rev 4 87/127 STM32WB15CC Electrical characteristics 115 Note: For information on selecting the crystal refer to application note AN2867 “Oscillator design guide for STM8S, STM8A and STM32 microcontrollers” available from www.st.com. Figure 16. Typical application with a 32.768 kHz crystal Note: No external resistors are required between OSC32_IN and OSC32_OUT, and it is forbidden to add one. In bypass mode the LSE oscillator is switched off and the input pin is a standard GPIO. The external clock signal has to respect the I/O characteristics detailed in Section 6.3.16. The recommend clock input waveform is shown in Figure 17. Figure 17. Low-speed external clock source AC timing diagram 1. Specified by design, not tested in production. 2. tSU(LSE) is the startup time measured from the moment it is enabled (by software) until a stable 32 kHz oscillation is reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer. MS30253V2 OSC32_IN OSC32_OUT Drive programmable amplifier fLSE 32.768 kHz resonator Resonator with integrated capacitors CL1 CL2 MS19215V2 VLSEH tf(LSE) 90% 10% TLSE t tr(LSE) VLSEL tw(LSEH) tw(LSEL) Table 51. Low-speed external user clock characteristics(1) – Bypass mode Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User external clock source frequency - 21.2 32.768 44.4 kHz |
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