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ATXMEGA8E5 데이터시트(PDF) 95 Page - Microchip Technology |
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ATXMEGA8E5 데이터시트(HTML) 95 Page - Microchip Technology |
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95 / 153 page ![]() 2018 Microchip Technology Inc. Data Sheet Complete DS40002059A-page 95 ATxmega32E5/16E5/8E5 Note: 1. Numbers for negative impedance are not tested in production but guaranteed from design and characterization. 36.13.8 External 32.768kHz Crystal Oscillator and TOSC Characteristics Table 36-28. External 32.768kHz Crystal Oscillator and TOSC Characteristics Note: 1. See Figure 36-4 for definition. Figure 36-4. TOSC Input Capacitance The parasitic capacitance between the TOSC pins is CL1 + CL2 in series as seen from the crystal when oscillating without external capacitors. CXTAL1 Parasitic capacitance XTAL1 pin 5.4 pF CXTAL2 Parasitic capacitance XTAL2 pin 7.1 CLOAD Parasitic capacitance load 3.07 Symbol Parameter Condition Min. Typ. Max. Units ESR/R1 Recommended crystal equivalent series resistance (ESR) Crystal load capacitance 6.5pF 60 k Crystal load capacitance 9.0pF 35 CTOSC1 Parasitic capacitance TOSC1 pin 5.3 pF CTOSC2 Parasitic capacitance TOSC2 pin 7.4 Recommended safety factor capacitance load matched to crystal specification 3.0 Symbol Parameter Condition Min. Typ. Max. Units CL1 CL2 2 C S O T 1 C S O T Device internal External 32.768kHz crystal |
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