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I.MX8XLITE Datasheet(PDF) 29 Page - NXP Semiconductors |
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I.MX8XLITE Datasheet(HTML) 29 Page - NXP Semiconductors |
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29 / 112 page  1. The required frequency accuracy is set by the serial interfaces utilized for a specific application and is detailed in the respective standard documents. 2. Cload is the specification of the quartz element, not for the capacitors coupled to the quartz element. 3.4.2 OSC32K This block implements an internal amplifier, trimmable load capacitors and a bias network that when combined with a suitable quartz crystal implements a low power oscillator. The Crystal connects to the RTC_XTALI and RTC_XTALO pins. Additionally, if the clock monitor determines that the 32KHz oscillation is not present, then the source of the 32 KHz clock will automatically switch to the internal ring oscillator of lesser frequency accuracy. CAUTION The internal ring oscillator is not meant to be used in customer applications, due to gross frequency variation over wafer processing, temperature, and supply voltage. These variations will cause timing issues to many different circuits that use the internal ring oscillator for reference; and, if this timing is critical, application issues will occur. To prevent application issues, it is recommended to only use an external crystal or an accurate external clock. If this recommendation is not followed, NXP cannot guarantee full compliance of any circuit using this clock. The OSC32K runs from VDD_SNVS_LDO_1P8_CAP, which is regulated from VDD_SNVS. The target battery/voltage range is 2.8 to 4.2 V for VDD_SNVS, with a regulated output of approximately 1.75 V. Table 17. OSC32K main characteristics Parameter Min Typ Max Comments Fosc — 32.768 kHz — This frequency is nominal and determined mainly by the crystal selected. 32.0 KHz is also supported. Current consumption — • xtal oscillator mode: 5 μA • 32K internal oscillator mode: 10 μA — These values are for typical process and room temperature. Values will be updated after silicon characterization. Table continues on the next page... Electrical characteristics i.MX 8XLite Industrial Applications Processors, Rev. 3, 08/2023 29 NXP Semiconductors |
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