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STM32L151VD Datasheet(PDF) 82 Page - STMicroelectronics |
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STM32L151VD Datasheet(HTML) 82 Page - STMicroelectronics |
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82 / 154 page  Electrical characteristics STM32L151xD STM32L152xD 82/154 DocID022027 Rev 11 Figure 16. HSE oscillator circuit diagram 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 29. 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 29. LSE oscillator characteristics (fLSE = 32.768 kHz)(1) 1. Guaranteed by characterization results. Symbol Parameter Conditions Min Typ Max Unit fLSE Low speed external oscillator frequency - - 32.768 - kHz RF Feedback resistor - - 1.2 - M Ω C(2) 2. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for ST microcontrollers”. Recommended load capacitance versus equivalent serial resistance of the crystal (RS)(3) 3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value for example MSIV-TIN32.768kHz. Refer to crystal manufacturer for more details. RS = 30 kΩ -8 - pF ILSE LSE driving current VDD = 3.3 V, VIN = VSS -- 1.1 µA IDD (LSE) LSE oscillator current consumption VDD = 1.8 V - 450 - nA VDD = 3.0 V - 600 - VDD = 3.6V - 750 - gm Oscillator transconductance - 3 - - µA/V tSU(LSE)(4) Startup time VDD is stabilized - 1 - s |
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