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STM32469VG Datasheet(PDF) 118 Page - STMicroelectronics |
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STM32469VG Datasheet(HTML) 118 Page - STMicroelectronics |
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118 / 220 page  Electrical characteristics STM32F469xx 118/220 DS11189 Rev 7 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 informations given in this paragraph are based on characterization results obtained with typical external components specified in Table 38. 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 selecting the crystal, refer to the application note AN2867 “Oscillator design guide for ST microcontrollers” available from www.st.com. Figure 32. Typical application with a 32.768 kHz crystal Table 38. LSE oscillator characteristics (fLSE = 32.768 kHz)(1) Symbol Parameter Conditions Min Typ Max Unit RF Feedback resistor - - 18.4 - M IDD LSE current consumption Low power mode(2) -- 1 µA High drive mode(2) -- 3 ACCLSE(3) LSE accuracy - − 500 - 500 ppm Gm_crit_max Maximum critical crystal gm Low power mode(2) - - 0.56 µA/V High drive mode(2) -- 1.5 tSU(LSE)(4) Startup time VDD is stabilized - 2 - s 1. Guaranteed by design. 2. LSE mode cannot be changed “on the fly” otherwise, a glitch can be generated on OSCIN pin. 3. This parameter depends on the crystal used in the application. Refer to application note AN2867. 4. 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 based on characterization and not tested in production. It is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. ai17531 OSC32_OU T OSC32_IN fLSE CL1 RF STM32F 32.768 kH z resonator Resonator with integrated capacitors Bias controlled gain CL2 |
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