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STM32WBA50KG Datasheet(PDF) 76 Page - STMicroelectronics |
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STM32WBA50KG Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 110 page  Electrical characteristics STM32WBA50KG 76/110 DS14688 Rev 1 5.3.9 External clock source characteristics High-speed external clock The high-speed external (HSE32) clock can be supplied with a 32 MHz crystal or a clock source. The devices include internal programmable capacitances that can be used to trim the crystal frequency, to compensate the PCB parasitic one. Table 47. HSE32 crystal requirements(1) Symbol Parameter Conditions Min Typ Max Unit fHSE Oscillator frequency(2) -- 32 - MHz fTOL Frequency tolerance(3) Includes initial accuracy, stability over temperature, aging, and frequency pulling due to incorrect load capacitance Bluetooth Low Energy -50 - 50 ppm CL Load capacitance - 8 - 18 pF CO Shunt capacitance - - - 4 ESR Equivalent series resistance - 60 - 150 Ω Cbank Capacitor bank range - 6.6 - 23.6 pF Cbank-step Capacitor bank step size - 215 270 325 fF tSTAB Oscillator stabilization time - - 100 160 µs IDDRF(HSE32) Current consumption - - 205 - µA 1. Specified by design, not tested in production. 2. 32 MHz XTAL is specified for two specific references: NX2016SA and NX1612SA. 3. After capacitor bank trimming. Table 48. HSE32 clock source requirements(1) Symbol Parameter Conditions Min Typ Max Unit fHSE32 External clock source frequency(2) -- 32 - MHz VHSE32 Clock input voltage limits Input level 0 - 0.9 V Amplitude(3) 200 - 900 mVPP DuCyHSE32 Duty cycle - 45 - 55 % φn(HSE32) 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. fHSE = 1 / tHSE. 3. AC coupling is supported (capacitor 470 pF to 100 nF). |
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