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AM652X Scheda tecnica(PDF) 154 Page - Texas Instruments |
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AM652X Scheda tecnica(HTML) 154 Page - Texas Instruments |
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154 / 277 page  OSC1_XI CK0 CK1 CK1 154 AM6548, AM6528, AM6546 AM6526, AM6527 SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019 www.ti.com Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2019, Texas Instruments Incorporated Table 5-27 details the OSC1 input clock timing requirements. Table 5-27. OSC1 Input Clock Timing Requirements NAME DESCRIPTION MIN TYP MAX UNIT CK0 1 / tc(OSC1_XI) Frequency, OSC1_XI 19.2, 20, 24, 25, 26, 27 MHz CK1 tw(OSC1_XI) Pulse duration, OSC1_XI low or high 0.45 × tc(OSC1_XI) 0.55 × tc(OSC1_XI) ns tj(OSC1_XI) Period jitter, OSC1_XI 0.01 × tc(OSC1_XI) ns tR(OSC1_XI) Rise time, OSC1_XI 5 ns tF(OSC1_XI) Fall time, OSC1_XI 5 ns tj(OSC1_XI) Frequency accuracy, OSC1_XI Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 Figure 5-19. OSC1_XI Input Clock 5.9.4.1.5 Auxiliary OSC1 Not Used For more Information see Section 4.5, Connections for Unused Pins. 5.9.4.1.6 WKUP_LFOSC0 Internal Oscillator Clock Source NOTE WKUP_LFOSC_XO/WKUP_LFOSC_XI - External main crystal interface pins connected to internal oscillator which sources reference clock provides a clock for low power operation in deeper sleep modes. For a list of supported low power modes for this device, please refer to Overview of Device Low-Power Modes section in the device TRM. Figure 5-20 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit board (PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper oscillator operation when combined with production crystal circuit components. In most cases, Rbias is not required and Rd is a 0 ohm resistor. These resistors may be removed from production PCB designs after evaluating oscillator performance with production crystal circuit components installed on preproduction PCBs. |
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