IMX28CEC datasheet(9/70 Pages) FREESCALE

9 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

PMU

Power

management

Unit (DC-DC)

Power

management

system

The i.MX28 integrates a comprehensive power supply subsystem, including

the following features:

• One integrated DC-DC converter that supports Li-Ion battery.

• Four linear regulators directly power the supply rails from 5-V.

• Linear battery charger for Li-Ion cells.

• Battery voltage and brownout detection monitoring for VDDD, VDDA,

VDDIO, VDD4P2 and 5-V supplies.

• Integrated current limiter from 5-V power source.

• Reset controller.

• System monitors for temperature and speed.

• Generates USB-Host 5-V from Li-Ion battery (using PWM).

• Support for on-the-fly transitioning between 5-V and battery power.

• VDD4P2, a nominal 4.2-V supply, is available when the i.MX28 is

connected to a 5-V source and allows the DCDC to run from a 5-V source

with a depleted battery.

• The 4.2-V regulated output also allows for programmable current limits:

– Battery Charge current + DCDC input current < the 5-V current limit

– DCDC input current (which ultimately provides current to the on-chip

and off-chip loads) as the priority and battery charge current is

automatically reduced if the 5-V current limit is reached

PWM(8)

Pulse width

modulation

Connectivity

peripherals

There are eight PWM output controllers that can be used in place of GPIO

pins. Applications include HSADC driving signals and LED & backlight

brightness control. Independent output control of each phase allows 0, 1, or

high-impedance to be independently selected for the active and inactive

phases. Individual outputs can be run in lock step with guaranteed

non-overlapping portions for differential drive applications.

PXP

Pixel Pipeline Multimedia

The pixel pipeline (PXP) is used to perform alpha blending of graphic or video

buffers with graphics data before sending to an LCD display. The PXP also

supports image rotation for hand-held devices that require both portrait and

landscape image support.

RTC

Real-time

clock, alarm,

watchdog

Clocks

The real-time clock (RTC) and alarm share a one-second pulse time domain.

The watchdog reset and millisecond counter run on a one-millisecond time

domain. The RTC, alarm, and persistent bits reside in a special power

domain (crystal domain) that remains powered up even when the rest of the

chip is in its powered-down state.

SAIF(2)

Serial audio

interface

Connectivity

peripherals

SAIF provides a half-duplex serial port for communication with a variety of

serial devices, including industry-standard codecs and DSPs. It supports a

continuous range of sample rates from 8 kHz–192 kHz using a

high-resolution fractional divider driven by the PLL. Samples are transferred

to/from the FIFO through the APBX DMA interface, a FIFO service interrupt,

or software polling.

SPDIF

Connectivity

peripherals

The Sony-Philips Digital Interface Format (SPDIF) transmitter module

transmits data according to the SPDIF digital audio interface standard

(IEC-60958).

Table 4. i.MX28 Digital and Analog Modules (continued)

Block

Mnemonic

Block Name

Subsystem

Brief Description

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