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STM32F405 数据表(PDF) 100 Page - STMicroelectronics |
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STM32F405 数据表(HTML) 100 Page - STMicroelectronics |
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100 / 204 page  Electrical characteristics STM32F405xx, STM32F407xx 100/203 DS8626 Rev 9 Low-speed external user clock generated from an external source The characteristics given in Table 31 result from tests performed using an low-speed external clock source, and under ambient temperature and supply voltage conditions summarized in Table 14. Figure 30. High-speed external clock source AC timing diagram Table 31. Low-speed external user clock characteristics Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User External clock source frequency(1) - - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage 0.7VDD -VDD V VLSEL OSC32_IN input pin low level voltage VSS -0.3VDD tw(LSE) tf(LSE) OSC32_IN high or low time(1) 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time(1) -- 50 Cin(LSE) OSC32_IN input capacitance(1) -- 5 - pF DuCy(LSE) Duty cycle - 30 - 70 % IL OSC32_IN Input leakage current VSS ≤ VIN ≤ VDD -- ±1 µA 1. Guaranteed by design. ai17528 OSC_IN External STM32F clock source VHSEH tf(HSE) tW(HSE) IL 90 % 10 % THSE t tr(HSE) tW(HSE) fHSE_ext VHSEL |
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