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I.MX8XLITE Datasheet(PDF) 18 Page - NXP Semiconductors |
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I.MX8XLITE Datasheet(HTML) 18 Page - NXP Semiconductors |
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18 / 112 page  The RTC_XTALI is used for real time functions. It supplies the clock for real time clock operation and for slow-system and watchdog counters. The clock input can be connected to either an external oscillator or a crystal using the internal oscillator amplifier. The system clock input XTALI is used to generate the main system clock. It supplies the PLLs and other peripherals. The system clock input requires a crystal using the internal oscillator amplifier. The PCIe oscillator can be sourced internally or input to the chip. In both cases, it is a 100 MHz nominal clock using HCSL signaling to provide the PCIe reference clock. The following table shows the interface frequency requirements. Table 6. External Input Clock Frequency Parameter Description Symbol Min Typ Max Unit RTC_XTALI Oscillator 1,2 fckil — 32.768 3/32.0 — kHz XTALI Oscillator 2, 4 fxtal — 24 — MHz PCIe oscillator 5 Frequency accuracy f100M — — — 100 — — ±300 MHz ppm 1. External oscillator or a crystal with internal oscillator amplifier. 2. The required frequency stability of this clock source is application dependent. For recommendations, see the hardware development guide for this device. 3. Recommended nominal frequency 32.768 kHz. 4. Fundamental frequency crystal with internal oscillator amplifier. 5. If using an external clock instead of the internal clock source, an HCSL-compatible clock is required. Concerning EMI/ EMC, note that the internal source is not spread-spectrum capable. The typical values shown in Table 6 are required for use with NXP board support packages (BSPs) to ensure precise time keeping and USB operations. 3.1.5 Maximum Supply Currents Note Some of the numbers shown in this table are based on the companion regulator limits and not actual use cases. Table 7. Maximum supply currents Symbol Value Unit Comments MEMC 2500 mA VDD_MAIN 2000 mA Table continues on the next page... Electrical characteristics 18 i.MX 8XLite Industrial Applications Processors, Rev. 3, 08/2023 NXP Semiconductors |
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