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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM652X 데이터시트(PDF) 148 Page - Texas Instruments |
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AM652X 데이터시트(HTML) 148 Page - Texas Instruments |
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148 / 299 page  CL= C C f1 2 f (C +C ) f1 f2 SPRS932_CLOCK_03 148 AM6548, AM6528, AM6546 AM6526, AM6527 SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018 www.ti.com Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2018, Texas Instruments Incorporated NOTE The load capacitors, Cf1 and Cf2 in Figure 5-22, should be chosen such that the below equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All discrete components used to implement the oscillator circuit should be placed as close as possible to the associated oscillator WKUP_LFOSC0_XI, WKUP_LFOSC0_XO, and VSS pins. Figure 5-22. Load Capacitance Equation The crystal must be in the fundamental mode of operation and parallel resonant. Table 5-24 summarizes the required electrical constraints Table 5-24. WKUP_LFOSC0 Crystal Electrical Characteristics NAME DESCRIPTION MIN TYP MAX UNIT fp Parallel resonance crystal frequency 32768 Hz Cf1 Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF Cf2 Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF Cshunt Shunt capacitance TBD pF ESR Crystal effective series resistance TBD kΩ When selecting a crystal, the system design must consider the temperature and aging characteristics of a based on the worst case environment and expected life expectancy of the system. Table 5-25 details the switching characteristics of the oscillator and the requirements of the input clock. Table 5-25. WKUP_LFOSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fxtal Oscillation frequency 32768 Hz tSX Start-up time (1) s |
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