IMX53IEC datasheet(23/173 Pages) FREESCALE

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Electrical Characteristics

i.MX53 Applications Processors for Industrial Products, Rev. 6

Freescale Semiconductor

4.1.6

USB-OH-3 (OTG + 3 Host ports) Module and the Two USB PHY (OTG

and H1) Current Consumption

Table 9 shows the USB interface current consumption.

4.2

Power Supply Requirements and Restrictions

The system design must comply with power-up sequence, power-down sequence and steady state

guidelines as described in this section to guarantee the reliable operation of the device. Any deviation from

these sequences may result in the following situations:

•

Excessive current during power-up phase

•

Prevention of the device from booting

•

Irreversible damage to the i.MX53 processor (worst-case scenario)

4.2.1

Power-Up Sequence

The following observations should be considered:

•

The consequent steps in power up sequence should not start before the previous step supplies have

been stabilized within 90-110% of their nominal voltage, unless stated otherwise.

•

NVCC_SRTC_POW should remain powered ON continuously, to maintain internal real-time

clock status. Otherwise, it has to be powered ON together with VCC, or preceding VCC.

•

The VCC should be powered ON together, or any time after NVCC_SRTC_POW.

•

NVCC_CKIH should be powered ON after VCC is stable and before other I/O supplies

(NVCC_xxx) are powered ON.

Table 9. USB Interface Current Consumption

Parameter

Conditions

Typical at 25 °C

Max

Unit

Analog Supply 3.3 V

USB_H1_VDDA33

USB_OTG_VDDA33

Full Speed

5.5

High Speed

Analog Supply 2.5 V

USB_H1_VDDA25

USB_OTG_VDDA25

Full Speed

6.5

High Speed

Digital Supply

VCC (1.2 V)

Full Speed

—

High Speed

—

IMX53IEC Datasheet(PDF) 23 Page - Freescale Semiconductor, Inc

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