IMX53CEC datasheet(25/204 Pages) FREESCALE

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Electrical Characteristics

i.MX53xD Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

4.1.6

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

and H1) Current Consumption

Table 10 shows the USB interface current consumption.

4.2

Power Supplies 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.MX53xD 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 IO supplies

(NVCC_xxx) are powered ON.

Table 10. 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

—

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