IMX8MPCEC datasheet(29/111 Pages) NXP

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Electrical characteristics

i.MX 8M Plus Applications Processor Datasheet for Consumer Products, Rev. 0, 03/2021

NXP Semiconductors

•

RTC_XTALO is connected to NVCC_SNVS_1P8 (1.8 V) through a 100 Kohm resistor.

i.MX 8M Plus has an integrated ring oscillator that allows the system to have an immediate clock. This

clock automatically switches to OSC32K XTAL when available. Additionally, if the clock monitor

determines that the OSC32K oscillation is not present, then the source of the 32 kHz clock will

automatically switch to the internal ring oscillator of lesser frequency accuracy.

CAUTION

The internal ring oscillator is not meant to be used in customer applications,

due to gross frequency variation over wafer processing, temperature, and

supply voltage. These variations will cause timing issues to many different

circuits that use the internal ring oscillator for reference; and, if this timing

is critical, application issues will occur. To prevent application issues, it is

recommended to only use an external crystal or an accurate external clock.

If this recommendation is not followed, NXP cannot guarantee full

compliance of any circuit using this clock.

Table 15 shows the external input clock for OSC32K.

When connecting to 24 MHz clock, following connections are recommended:

•

1.8 V square waveform to XTALI_24M

•

XTALO_24M is connected to VDD_24M_XTAL_1P8 through a 400 ohm resistor.

Table 16 shows the external input clock for 24 MHz.

3.1.6.1

On-chip OSC32K

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

Table 15. External input clock for OSC32K

Symbol

Min

Typ

Max

Unit

Frequency

—

32.768

—

kHz

RTC_XTALI

VIH

0.7 x NVCC_SNVS_1P8

—

NVCC_SNVS_1P8

VIL

—

0.3 x NVCC_SNVS_1P8

IIH

-12

—

µA

IIL

-12

—

µA

Table 16. External input clock for 24 MHz

Symbol

Min

Typ

Max

Unit

Frequency

—

MHz

XTALI_24M

VIH

0.7 x Vdd

—Vdd + 0.3

VIL

-0.3

—

0.3 x Vdd

IIH

-12

—

µA

IIL

-12

—

µA

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