IMX6SDLCEC datasheet(38/169 Pages) NXP

38 / 169 page

i.MX 6Solo/6DualLite Applications Processors for Consumer Products, Rev. 9, 11/2018

NXP Semiconductors

Electrical Characteristics

4.4.6

Arm PLL

4.5

On-Chip Oscillators

4.5.1

OSC24M

This block implements an amplifier that when combined with a suitable quartz crystal and external load

capacitors implements an oscillator. The oscillator is powered from NVCC_PLL_OUT.

The system crystal oscillator consists of a Pierce-type structure running off the digital supply. A straight

forward biased-inverter implementation is used.

4.5.2

OSC32K

This block implements an amplifier that when combined with a suitable quartz crystal and external load

capacitors implements a low power oscillator. It also implements a power mux such that it can be powered

from either a ~3 V backup battery (VDD_SNVS_IN) or VDD_HIGH_IN such as the oscillator consumes

power from VDD_HIGH_IN when that supply is available and transitions to the back up battery when

VDD_HIGH_IN is lost.

In addition, if the clock monitor determines that the OSC32K is not present, then the source of the 32 kHz

clock will automatically switch to the internal ring oscillator.

CAUTION

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 must be given to the

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

The OSC32k runs from VDD_SNVS_CAP supply, which comes from VDD_HIGH_IN/VDD_SNVS_IN.

Table 20. Arm PLL’s Electrical Parameters

Parameter

Value

Clock output range

650 MHz ~ 1.3 GHz

Reference clock

24 MHz

Lock time

<2250 reference cycles

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