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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM62A7 датащи(PDF) 114 Page - Texas Instruments |
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AM62A7 датащи(HTML) 114 Page - Texas Instruments |
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114 / 238 page  CL= C C f1 2 f (C +C ) f1 f2 J7ES_CL_MATH_03 Figure 7-22. Load Capacitance Equation The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-24 summarizes the required electrical constraints. Table 7-24. 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 ESRxtal – 40 kΩ 4 pF ESRxtal – 60 kΩ 3 pF ESRxtal – 80 kΩ 2 pF ESRxtal – 100 kΩ 1 pF ESR Crystal effective series resistance (1) Ω (1) The maximum ESR of the crystal is a function of the crystal frequency and shunt capacitance. See the Cshunt parameter. 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 7-25 details the switching characteristics of the oscillator and the requirements of the input clock. Table 7-25. WKUP_LFOSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fxtal Oscillation frequency 32768 Hz tsX Start-up time 96.5 ms VDDS_OSC0 WKUP_LFOSC0_XO t sX Time VSS VDDS_OSC0 (min.) VDD_CORE (min.) VSS VDD_CORE LFXOSC_STARTUP_02 Figure 7-23. WKUP_LFOSC0 Start-up Time AM62A7, AM62A7-Q1, AM62A3, AM62A3-Q1 SPRSP77A – MARCH 2023 – REVISED AUGUST 2023 www.ti.com 114 Submit Document Feedback Copyright © 2023 Texas Instruments Incorporated Product Folder Links: AM62A7 AM62A7-Q1 AM62A3 AM62A3-Q1 |
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