PIMXRT406LCFP4A datasheet(17/71 Pages) NXP

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Electrical characteristics

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

NXP Semiconductors

4.1.4

External clock sources

Each i.MX RT1015 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 watch-dog counters. The clock input can be

connected to either external oscillator or a crystal using internal oscillator amplifier. Additionally, there is

an internal ring oscillator, which can be used instead of the RTC_XTALI if 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 external oscillator or a crystal using internal

oscillator amplifier.

Table 10 shows the interface frequency requirements.

The typical values shown in Table 10 are required for use with NXP SDK 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

System frequency/

Bus frequency

FSYS/FBUS

—500/

125

396/

132

24/

MHz —

Temperature Operating Ranges

Junction

temperature

Standard

Commercial

0—

See the application note, i.MX

RT1015 Product Lifetime Usage

Estimates for information on

product lifetime (power-on years)

for this processor.

1 Applying the maximum voltage results in maximum power consumption and heat generation. NXP recommends a voltage set

point = (Vmin + the supply tolerance). This result in an optimized power/speed ratio.

2 Applying the maximum voltage results in shorten lifetime. 3.6 V usage limited to < 1% of the use profile. Reset of profile limited

to below 3.49 V.

3 In setting VDD_SNVS_IN voltage with regards to Charging Currents and RTC, refer to the i.MX RT1015 Hardware

Development Guide (IMXRT1015HDG).

Table 10. 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 RT1015 Crossover Processors (IMXRT1015HDG).

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

Table 9. Operating ranges (continued)

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