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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32WB10CC датащи(PDF) 73 Page - STMicroelectronics |
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STM32WB10CC датащи(HTML) 73 Page - STMicroelectronics |
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73 / 110 page  DS13259 Rev 2 73/110 STM32WB10CC Electrical characteristics 102 6.3.9 External clock source characteristics High-speed external user clock generated from an external source The high-speed external (HSE) clock is supplied with a 32 MHz crystal oscillator, a sine or a square wave. The STM32WB10CC includes internal programmable capacitances that can be used to tune the crystal frequency in order to compensate the PCB parasitic one. The characteristics in Table 44 and Table 46 are measured over recommended operating conditions, unless otherwise specified. Typical values are referred to TA = 25 °C and VDD = 3.0 V. Table 44. HSE crystal requirements(1) Symbol Parameter Conditions Min Typ Max Unit fNOM Oscillator frequency - - 32 - MHz fTOL Frequency tolerance Includes initial accuracy, stability over temperature, aging and frequency pulling due to incorrect load capacitance. - - 50 ppm CL Load capacitance - 6 - 8 pF ESR Equivalent series resistance - - - 100 Ω PD Drive level - - - 100 µW 1. 32 MHz XTAL is specified for two specific references: NX2016SA and NX1612SA. Table 45. HSE clock source requirements(1) Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency -- 32 - MHz fTOLHSE Frequency tolerance Includes initial accuracy, stability over temperature, aging. -- 50 ppm VHSE Clock input voltage limit Sine or square wave, AC coupled(2) 0.4 - 1.6 VPP tr, tf Rise and fall times 10%-90% square wave - - 15 * VPP ns DuCy(HSE) Duty cycle - 45 50 55 % φn(HSE) Phase noise for 32 MHz Offset = 10 kHz - - -127 dBc / Hz Offset = 100 kHz - - -135 Offset = 1 MHz - - -138 1. Specified by design, not tested in production. 2. Only AC coupling supported (capacitor 470 pF to 100 nF). |
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