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AM6421...ALV 数据表(PDF) 125 Page - Texas Instruments |
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AM6421...ALV 数据表(HTML) 125 Page - Texas Instruments |
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125 / 244 page  Device MCU_OSC0_XO MCU_OSC0_XI C L1 Crystal C L2 AM65x_MCU_OSC_INT_01 PCB Ground Figure 7-17. MCU_OSC0 Crystal Implementation The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-17 summarizes the required electrical constraints. Table 7-17. MCU_OSC0 Crystal Circuit Requirements PARAMETER MIN TYP MAX UNIT Fxtal Crystal Parallel Resonance Frequency 25 MHz Fxtal Crystal Frequency Stability and Tolerance Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 CL1+PCBXI Capacitance of CL1 + CPCBXI 12 24 pF CL2+PCBXO Capacitance of CL2 + CPCBXO 12 24 pF CL Crystal Load Capacitance 6 12 pF Cshunt Crystal Circuit Shunt Capacitance ESRxtal = 30 Ω 25 MHz 7 pF ESRxtal = 40 Ω 25 MHz 5 pF ESRxtal = 50 Ω 25 MHz 5 pF ESRxtal 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 temperature and aging characteristics of the crystal based on worst case environment and expected life expectancy of the system. Table 7-18 details the switching characteristics of the oscillator. Table 7-18. MCU_OSC0 Switching Characteristics - Crystal Mode PARAMETER MIN TYP MAX UNIT CXI XI Capacitance 1.44 pF CXO XO Capacitance 1.52 pF CXIXO XI to XO Mutual Capacitance 0.01 pF ts Start-up Time 4 ms www.ti.com AM6442, AM6441, AM6421, AM6412, AM6411 SPRSP56D – JANUARY 2021 – REVISED JULY 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 125 Product Folder Links: AM6442 AM6441 AM6421 AM6412 AM6411 |
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