MCIMX6DP6AYM2AB datasheet(24/160 Pages) NXP

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i.MX 6DualPlus/6QuadPlus Applications Processors Industrial Products, Rev. 3, 11/2018

NXP Semiconductors

Electrical Characteristics

4.1.4

External Clock Sources

Each i.MX 6DualPlus/6QuadPlus processor has two external input system clocks: a low frequency

(RTC_XTALI) and a high frequency (XTALI).

The RTC_XTALI is used for low-frequency functions. It supplies the clock for wake-up circuit,

power-down real time clock operation, and slow system and watchdog counters. The clock input can be

connected to either an external oscillator or a crystal using the internal oscillator amplifier. Additionally,

there is an internal ring oscillator, that can be used instead of RTC_XTALI when accuracy is not important.

The system clock input XTALI is used to generate the main system clock. It supplies the PLLs and other

peripherals. The system clock input can be connected to either an external oscillator or a crystal using the

internal oscillator amplifier.

NOTE

The internal RTC oscillator does not provide an accurate frequency and is

affected by process, voltage and temperature variations. NXP strongly

recommends using an external crystal as the RTC_XTALI reference. If the

internal oscillator is used instead, careful consideration should be given to

the timing implications on all of the SoC modules dependent on this clock.

Table 7 shows the interface frequency requirements.

The typical values shown in Table 7 are required for use with NXP BSPs to ensure precise time keeping

and USB operation. For RTC_XTALI operation, two clock sources are available:

•

On-chip 40 kHz ring oscillator: This clock source has the following characteristics:

— Approximately 25

μA more Idd than crystal oscillator

— Approximately ±50% tolerance

— No external component required

— Starts up quicker than 32 kHz crystal oscillator

•

External crystal oscillator with on-chip support circuit

10 All digital I/O supplies (NVCC_xxxx) must be powered under normal conditions whether the associated I/O pins are in use or

not, and associated I/O pins need to have a pull-up or pull-down resistor applied to limit any floating gate current.

11 This supply also powers the pre-drivers of the DDR I/O pins; therefore, it must always be provided, even when LVDS is not used.

Table 7. External Input Clock Frequency

Parameter Description

Symbol

Min

Typ

Max

Unit

RTC_XTALI Oscillator1,2

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 i.MX 6Dual, 6Quad, 6Solo, 6DualLite Families of Applications Processors (IMX6DQ6SDLHDG).

fckil

—

32.7683/32.0

3 Recommended nominal frequency 32.768 kHz.

—kHz

XTALI Oscillator2,4

4 External oscillator or a fundamental frequency crystal with internal oscillator amplifier.

fxtal

—24

—

MHz

MCIMX6DP6AYM2AB Datasheet(PDF) 24 Page - NXP Semiconductors

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