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NRF52811-QFAA-R7 bảng dữ liệu(PDF) 73 Page - Nordic Semiconductor |
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NRF52811-QFAA-R7 bảng dữ liệu(HTML) 73 Page - Nordic Semiconductor |
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73 / 444 page  Power and clock management Symbol Description Min. Typ. Max. Units RS_HFXO_7PF Equivalent series resistance C0 = 7 pF 60 ohm RS_HFXO_5PF Equivalent series resistance C0 = 5 pF 60 ohm RS_HFXO_3PF Equivalent series resistance C0 = 3 pF 100 ohm PD_HFXO Drive level 100 uW CPIN_HFXO Input capacitance XC1 and XC2 4 pF tSTART_HFXO Startup time 0.36 ms 5.4.4.3 32.768 kHz RC oscillator (LFRC) Symbol Description Min. Typ. Max. Units fNOM_LFRC Nominal frequency 32.768 kHz fTOL_LFRC Frequency tolerance ±2 % fTOL_CAL_LFRC Frequency tolerance for LFRC after calibration11 ±500 ppm tSTART_LFRC Startup time for 32.768 kHz RC oscillator 600 us 5.4.4.4 32.768 kHz crystal oscillator (LFXO) Symbol Description Min. Typ. Max. Units fNOM_LFXO Crystal frequency 32.768 kHz fTOL_LFXO_BLE Frequency tolerance requirement for BLE stack ±250 ppm fTOL_LFXO_ANT Frequency tolerance requirement for ANT stack ±50 ppm CL_LFXO Load capacitance 12.5 pF C0_LFXO Shunt capacitance 2 pF RS_LFXO Equivalent series resistance 100 kohm PD_LFXO Drive level 0.5 uW Cpin Input capacitance on XL1 and XL2 pads 4 pF tSTART_LFXO Startup time for 32.768 kHz crystal oscillator 0.25 s VAMP_IN_XO_LOW Peak to peak amplitude for external low swing clock. Input signal must not swing outside supply rails. 200 1000 mV 5.4.4.5 32.768 kHz synthesized from HFCLK (LFSYNT) Symbol Description Min. Typ. Max. Units fNOM_LFSYNT Nominal frequency 32.768 kHz fTOL_LFSYNT Frequency tolerance in addition to HFLCK tolerance12 8 ppm tSTART_LFSYNT Startup time for synthesized 32.768 kHz 100 us 11 Constant temperature within ±0.5 °C and calibration performed at least every 8 seconds, defined as 3 sigma 12 Frequency tolerance will be derived from the HFCLK source clock plus the LFSYNT tolerance 4454_140 v1.0 73 |
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