IMX7DCEC datasheet(26/161 Pages) NXP

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Electrical characteristics

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

NXP Semiconductors

The typical values shown in Table 11 are required for use with NXP BSPs to ensure precise time keeping

and USB operation. For RTC_XTALI operation, two clock sources are available. If there is not an

externally applied oscillator to RTC_XTALI, the internal oscillator takes over.

• On-chip 32 kHz RC oscillator—this clock source has the following characteristics:

— Approximately 25 µA more IDD than crystal oscillator

— Approximately ±10% tolerance

— No external component required

— Starts up faster than 32 kHz crystal oscillator

— Three configurations for this input:

– External oscillator

– External crystal coupled to RTC_XTALI and RTC_XTALO

– Internal oscillator

External crystal oscillator with on-chip support circuit:

— At power up, RC oscillator is utilized. After crystal oscillator is stable, the clock circuit

switches over to the crystal oscillator automatically.

— Higher accuracy than RC oscillator

— If no external crystal is present, then the RC oscillator is utilized

The decision of choosing a clock source should be taken based on real-time clock use and precision

timeout.

4.1.5

Maximum supply currents

The Power Virus numbers shown in Table 12 represent a use case designed specifically to show the

maximum current consumption possible. All cores are running at the defined maximum frequency and are

limited to L1 cache accesses only to ensure no pipeline stalls. Although a valid condition, it would have a

very limited practical use case, if at all, and be limited to an extremely low duty cycle unless the intention

was to specifically show the worst case power consumption.

The MC3xPF3000xxxx, NXP’s power management IC targeted for the i.MX 7Dual family of processors,

supports the Power Virus mode operating at 1% duty cycle. Higher duty cycles are allowed, but a robust

thermal design is required for the increased system power dissipation.

Table 12 represents the maximum momentary current transients on power lines, and should be used for

power supply selection. Maximum currents are higher by far than the average power consumption of

typical use cases. For typical power consumption information, see the application note, i.MX 7DS Power

Consumption Measurement (AN5383).

Table 12. Maximum supply currents

Power Rail

Source

Conditions

Max Current

Unit

VDD_ARM

From PMIC

—

500

VDD_SOC

From PMIC

—

1000

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