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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F301C6 датащи(PDF) 76 Page - STMicroelectronics |
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STM32F301C6 датащи(HTML) 76 Page - STMicroelectronics |
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76 / 141 page  Electrical characteristics STM32F301x6 STM32F301x8 76/141 DS9895 Rev 8 High-speed external clock generated from a crystal/ceramic resonator The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on design simulation results obtained with typical external components specified in Table 41. 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). Table 41. HSE oscillator characteristics Symbol Parameter Conditions(1) 1. Resonator characteristics given by the crystal/ceramic resonator manufacturer. Min(2) 2. Guaranteed by design. Typ Max(2) Unit fOSC_IN Oscillator frequency - 4 8 32 MHz RF Feedback resistor - - 200 - k Ω IDD HSE current consumption During startup(3) 3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time. -- 8.5 mA VDD=3.3 V, Rm= 30Ω, CL=10 pF@8 MHz -0.4 - VDD=3.3 V, Rm= 45Ω, CL=10 pF@8 MHz -0.5 - VDD=3.3 V, Rm= 30Ω, CL= 5 pF@32 MHz -0.8 - VDD=3.3 V, Rm= 30Ω, CL=10 pF@32 MHz -1 - VDD=3.3 V, Rm= 30Ω, CL=20 pF@32 MHz -1.5 - gm Oscillator transconductance Startup 10 - - mA/V tSU(HSE)(4) 4. tSU(HSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 8 MHz 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 - 2 - ms |
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