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AM6421 Datasheet(PDF) 131 Page - Texas Instruments |
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AM6421 Datasheet(HTML) 131 Page - Texas Instruments |
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131 / 237 page  The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-16 summarizes the required electrical constraints. Table 7-16. 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 100 Ω 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 7-17 details the switching characteristics of the oscillator. Table 7-17. MCU_OSC0 Switching Characteristics - Crystal Mode PARAMETER MIN TYP MAX UNIT CXI XI Capacitance TBD pF CXO XO Capacitance TBD pF CXIXO XI to XO Mutual Capacitance TBD pF ts Start-up Time 4 ms VDDS_OSC0 MCU_OSC0_XO t sX Time VSS VDDS_OSC0 (min.) VDD_MCU (min.) VSS VDD_MCU AM65x_MCU_OSC_STARTUP_02 Figure 7-16. MCU_OSC0 Start-up Time 7.10.4.1.1.1 Load Capacitance The crystal circuit must be designed such that it applies the appropriate capacitive load to the crystal, as defined by the crystal manufacturer. The capacitive load, CL, of this circuit is a combination of discrete capacitors CL1, CL2, and several parasitic contributions. PCB signal traces which connect crystal circuit components to MCU_OSC0_XI and MCU_OSC0_XO have parasitic capacitance to ground, CPCBXI and CPCBXO, where the PCB www.ti.com AM6442, AM6441, AM6421 AM6412, AM6411 SPRSP56 – JANUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 131 Product Folder Links: AM6442 AM6441 AM6421 AM6412 AM6411 |
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