Datasheet

Electrical Characteristics
i.MX 6Dual/6Quad Applications Processors for Industrial Products, Rev. 6, 11/2018
NXP Semiconductors 35
4.4.5 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, which comes from the VDD_HIGH_IN/VDD_SNVS_IN
power mux.
Table 18. Arm PLL Electrical Parameters
Parameter Value
Clock output range 650 MHz~1.3 GHz
Reference clock 24 MHz
Lock time <2250 reference cycles