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STM32F730Z8 Datasheet(PDF) 117 Page - STMicroelectronics |
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STM32F730Z8 Datasheet(HTML) 117 Page - STMicroelectronics |
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117 / 202 page  DS12536 Rev 2 117/202 STM32F730x8 Electrical characteristics 185 Figure 29. 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 4 to 26 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 40. 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 40. HSE 4-26 MHz oscillator characteristics(1) 1. Guaranteed by design. Symbol Parameter Conditions Min Typ Max Unit fOSC_IN Oscillator frequency - 4 - 26 MHz RF Feedback resistor - - 200 - k Ω IDD HSE current consumption VDD=3.3 V, ESR= 30 Ω, CL=5 pF@25 MHz - 450 - µA VDD=3.3 V, ESR= 30 Ω, CL=10 pF@25 MHz - 530 - ACCHSE(2) 2. This parameter depends on the crystal used in the application. The minimum and maximum values must be respected to comply with USB standard specifications. HSE accuracy - − 500 - 500 ppm Gm_crit_max Maximum critical crystal gm Startup - - 1 mA/V tSU(HSE(3) 3. 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 based on characterization results. It is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. Startup time VDD is stabilized - 2 - ms ai17529 OSC32_IN External STM32F clock source VLSEH tf(LSE) tW(LSE) IL 90% 10 % TLSE t tr(LSE) tW(LSE) fLSE_ext VLSEL |
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