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NRF52820-QDAA-R7 Datasheet(PDF) 83 Page - Nordic Semiconductor |
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NRF52820-QDAA-R7 Datasheet(HTML) 83 Page - Nordic Semiconductor |
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83 / 437 page  Power and clock management Symbol Description Min. Typ. Max. Units C0_HFXO Shunt capacitance 7 pF RS_HFXO_7PF Equivalent series resistance 3 pF < C0 ≤ 7 pF 60 Ω RS_HFXO_3PF Equivalent series resistance C0 ≤ 3 pF 100 Ω PD_HFXO Drive level 100 µW CPIN_HFXO Input capacitance XC1 and XC2 3 pF ISTBY_X32M Core standby current for various crystals ISTBY_X32M_X0 Typical parameters for a given 2.5mm x 2.0mm crystal: CL_HFXO = 8 pF, C0_HFXO = 1 pF, LM_HFXO = 7 mH, RS_HFXO = 20 Ω 65 µA ISTBY_X32M_X1 Typical parameters for a given 1.6mm x 1.2mm crystal: CL_HFXO = 8 pF, C0_HFXO = 0.4 pF, LM_HFXO = 20 mH, RS_HFXO = 40 Ω 110 µA ISTART_X32M Average startup current for various crystals, first 1 ms ISTART_X32M_X0 Typical parameters for a given 2.5mm x 2.0mm crystal: CL_HFXO = 8 pF, C0_HFXO = 1 pF, LM_HFXO = 7 mH, RS_HFXO = 20 Ω 360 µA ISTART_X32M_X1 Typical parameters for a given 1.6mm x 1.2mm crystal: CL_HFXO = 8 pF, C0_HFXO = 0.4 pF, LM_HFXO = 20 mH, RS_HFXO = 40 Ω 785 µA tPOWERUP_X32M Power-up time for various crystals tPOWERUP_X32M_X0 Typical parameters for a given 2.5mm x 2.0mm crystal: CL_HFXO = 8 pF, C0_HFXO = 1 pF, LM_HFXO = 7 mH, RS_HFXO = 20 Ω 60 µs tPOWERUP_X32M_X1 Typical parameters for a given 1.6mm x 1.2mm crystal: CL_HFXO = 8 pF, C0_HFXO = 0.4 pF, LM_HFXO = 20 mH, RS_HFXO = 40 Ω 200 µs 5.4.4.3 Low frequency 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 ±500 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 kΩ PD_LFXO Drive level 0.5 μW Cpin Input capacitance on XL1 and XL2 pads 4 pF ILFXO Run current for 32.768 kHz crystal oscillator 0.23 µA tSTART_LFXO Startup time for 32.768 kHz crystal oscillator 0.25 s tSTART_LFXO_EXT Startup time for 32.768 kHz crystal oscillator when CLOCK.LFXODEBOUNCE configured for Extended debounce time 0.5 s 5.4.4.4 Low frequency RC oscillator (LFRC) 4463_156 v1.0 83 |
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