IMX7DCEC datasheet(25/161 Pages) NXP

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Electrical characteristics

i.MX 7Dual Family of Applications Processors Datasheet, Rev. 7, 09/2023

NXP Semiconductors

Table 10 shows on-chip LDO regulators that can supply on-chip loads.

4.1.4

External clock sources

Each i.MX 7Dual 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 resistor-capacitor (RC) 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 an external oscillator or a crystal using

internal oscillator amplifier.

Table 11 shows the interface frequency requirements.

Table 10. On-chip LDOs1 and their on-chip loads

1 On-chip LDOs are designed to supply i.MX 7Dual loads and must not be used to supply external loads.

Voltage Source

Load

Comment

VDDD_1P0_CAP

VDD_MIPI_1P0

Connect directly (short) via board level

PCIE_VP

PCIE_VP_RX

PCIE_VP_TX

VDD_1P2_CAP

VDD_USB_H_1P2

Connect directly (short) via board level

VDDA_PHY_1P8

VDDA_MIPI_1P8

Connect directly (short) via board level

PCIE_VPH

PCIE_VPH_RX

PCIE_VPH_TX

Table 11. 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. See Hardware Development Guide for

i.MX7Dual and 7Solo Applications Processors.

fckil

—

32.7683

3 Recommended nominal frequency 32.768 kHz.

—

kHz

XTALI Oscillator2,4

4 External oscillator or a fundamental frequency crystal appropriately coupled to the internal oscillator amplifier.

fxtal

MHz

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