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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32WB50CG датащи(PDF) 77 Page - STMicroelectronics |
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STM32WB50CG датащи(HTML) 77 Page - STMicroelectronics |
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77 / 119 page  DS13047 Rev 5 77/119 STM32WB50CG STM32WB30CE Electrical characteristics 110 6.3.10 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 or a sine or a square wave. The STM32WB50CG and STM32WB30CE include internal programmable capacitances that can be used to tune the crystal frequency to compensate the PCB parasitic one. The characteristics in Table 48 and Table 50 are measured over recommended operating conditions, unless otherwise specified. Typical values are referred to TA = 25 °C and VDD = 3.0 V. Table 47. Wakeup time using USART(1) Symbol Parameter Conditions Typ Max Unit tWUUSART Wakeup time needed to calculate the maximum USART baud rate allowing to wakeup up from Stop mode when USART clock source is HSI16 Stop mode 0 - 1.7 µs Stop mode 1/2 - 8.5 1. Guaranteed by design. Table 48. 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. -- (2) ppm CL Load capacitance - 6 - 8 pF ESR Equivalent series resistance - - - 100 Ω 1. 32 MHz XTAL is specified for two specific references: NX2016SA and NX1612SA. 2. Refer to the standard specification: 50 ppm for BLE, 40 ppm for 802.15.4. Table 49. HSE clock source characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fHSE_ext Oscillator frequency - - 32 - MHz fTOLHSE Frequency tolerance Includes initial accuracy, stability over temperature and aging -- (2) ppm VHSE Clock input voltage limits Sine or square wave, AC-coupled(3) 0.4 - 1.6 VPP DuCy(HSE) Duty cycle - 45 50 55 % tr, tf Rise and fall times 10% - 90% square wave - - 15 * VPP ns φn(HSE) Phase noise for 32 MHz Offset = 10 kHz - - -127 dBc/Hz Offset = 100 kHz - - -135 Offset = 1 MHz - - -138 1. Guaranteed by design. |
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