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LQFP64 Datasheet(PDF) 102 Page - STMicroelectronics |
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LQFP64 Datasheet(HTML) 102 Page - STMicroelectronics |
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102 / 204 page  Electrical characteristics STM32F405xx, STM32F407xx 102/203 DS8626 Rev 9 Note: For information on electing the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Figure 32. Typical application with an 8 MHz crystal 1. REXT value depends on the crystal characteristics. Low-speed external clock generated from a crystal/ceramic resonator The low-speed external (LSE) clock can be supplied with a 32.768 kHz 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). Note: For information on electing the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from the ST website www.st.com. Table 33. LSE oscillator characteristics (fLSE = 32.768 kHz) (1) 1. Guaranteed by design. Symbol Parameter Conditions Min Typ Max Unit fOSC_IN Oscillator frequency - - 32.768 - MHz RF Feedback resistor - - 18.4 - M Ω IDD LSE current consumption - - - 1 µA Gm Oscillator transconductance Startup 2.8 - - µA/V Gmcritmax Maximum critical crystal Gm - - 0.56 tSU(LSE)(2) 2. Guaranteed by characterization. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz 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 - s ai17530 OSC_OU T OSC_IN fHSE CL1 RF STM32F 8 MHz resonator Resonator with integrated capacitors Bias controlled gain REXT(1) CL2 |
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