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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32MP157D датащи(PDF) 151 Page - STMicroelectronics |
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STM32MP157D датащи(HTML) 151 Page - STMicroelectronics |
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151 / 259 page  DS12504 Rev 5 151/259 STM32MP157A/D Electrical characteristics 237 Figure 18. Low-speed external clock source AC timing diagram High-speed external clock generated from a crystal/ceramic resonator The high-speed external (HSE) clock can be supplied with a 8 to 48 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 33. 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). ai17529b OSC32_IN External STM32 clock source VLSEH tf(LSE) tW(LSE) IL 90% 10 % TLSE t tr(LSE) tW(LSE) fLSE_ext VLSEL Table 33. 8-48 MHz HSE oscillator characteristics(1) Symbol Parameter Operating conditions(2) Min Typ Max Unit F Oscillator frequency - 8 24 48 MHz RF Feedback resistor - - 200 - kΩ IDD(HSE) HSE current consumption During startup(3) -- 4 mA VDD = 3 V, Rm = 150 Ω CL = 12 pF at 4 MHz -0.35 - VDD = 3 V, Rm = 120 Ω CL = 12 pF at 16 MHz -0.40 - VDD = 3 V, Rm = 100 Ω CL = 10 pF at 24 MHz -0.45 - VDD = 3 V, Rm = 80 Ω CL = 8 pF at 32 MHz -0.65 - VDD = 3 V, Rm = 80 Ω CL = 8 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. Guaranteed by design. 2. Resonator characteristics given by the crystal/ceramic resonator manufacturer. |
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