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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32H7B0AB датащи(PDF) 91 Page - STMicroelectronics |
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STM32H7B0AB датащи(HTML) 91 Page - STMicroelectronics |
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91 / 205 page  Figure 22. Low-speed external clock source AC timing diagram OSC32 _IN External STM32 clock source VLSEH tf(LSE) tW(LSE) IL 90 % 10 % T LSE t tr(LSE) tW(LSE) fLSE_ext VLSEL High-speed external clock generated from a crystal/ceramic resonator The high-speed external (HSE) clock can be supplied with a 4 to 50 MHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on characterization results obtained with typical external components specified in Table 47. 4-50 MHz HSE oscillator characteristics. 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 47. 4-50 MHz HSE oscillator characteristics Symbol Parameter Operating conditions(1) Min(2) Typ(2) Max(2) Unit F Oscillator frequency - 4 - 50 MHz RF Feedback resistor - - 200 - kΩ IDD(HSE) HSE current consumption During startup(3) - - 4 mA VDD=3 V, Rm=30 Ω CL=10 pF at 4 MHz - 0.35 - VDD=3 V, Rm=30 Ω CL=10 pF at 8 MHz - 0.40 - VDD=3 V, Rm=30 Ω CL=10 pF at 16 MHz - 0.45 - VDD=3 V, Rm=30 Ω CL=10 pF at 32 MHz - 0.65 - VDD=3 V, Rm=30 Ω CL=10 pF at 48 MHz - 0.95 - Gmcritmax Maximum critical crystal gm Startup - - 1.5 mA/V tSU(4) Start-up time VDD is stabilized - 2 - ms 1. Resonator characteristics given by the crystal/ceramic resonator manufacturer. 2. Guaranteed by design. 3. This consumption level occurs during the first 2/3 of the tSU(HSE) startup time. STM32H7B0xB Operating conditions DS13196 - Rev 7 page 91/205 |
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