PIMXRT406LCAE4A datasheet(24/71 Pages) NXP

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i.MX RT1015 Crossover Processors Data Sheet for Industrial Products, Rev. 2, 03/2021

NXP Semiconductors

Electrical characteristics

4.2.3.3

Ethernet PLL

4.2.3.4

USB PLL

4.2.4

On-chip oscillators

4.2.4.1

OSC24M

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

capacitors implement an oscillator. The oscillator is powered from NVCC_PLL.

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

forward biased-inverter implementation is used.

4.2.4.2

OSC32K

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

capacitors implement 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 backup 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 K

will automatically switch to a crude internal ring oscillator. The frequency range of this block is

approximately 10–45 kHz. It highly depends on the process, voltage, and temperature.

The OSC32k runs from VDD_SNVS_CAP supply, which comes from the

VDD_HIGH_IN/VDD_SNVS_IN. The target battery is a ~3 V coin cell. Proper choice of coin cell type

is necessary for chosen VDD_HIGH_IN range. Appropriate series resistor (Rs) must be used when

connecting the coin cell. Rs depends on the charge current limit that depends on the chosen coin cell. For

example, for Panasonic ML621:

Table 16. Ethernet PLL’s electrical parameters

Parameter

Value

Clock output range

1 GHz

Reference clock

24 MHz

Lock time

< 11250 reference cycles

Table 17. USB PLL’s electrical parameters

Parameter

Value

Clock output range

480 MHz PLL output

Reference clock

24 MHz

Lock time

< 383 reference cycles

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