IMX28AEC datasheet(8/72 Pages) FREESCALE

8 / 72 page

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

Freescale Semiconductor

LCDIF

LCD Interface Multimedia

peripherals

The LCDIF provides display data for external LCD panels from simple

text-only displays to WVGA, 16/18/24 bpp color TFT panels. The LCDIF

supports all of these different interfaces by providing fully programmable

functionality and sharing register space, FIFOs, and ALU resources at the

same time. The LCDIF supports RGB (DOTCLK) modes as well as system

mode including both VSYNC and WSYNC modes.

LRADC

Low resolution

ADC module

Connectivity

peripherals

The sixteen-channel 12-bit low-resolution ADC (LRADC) block is used for

voltage measurement. Channels 0 – 6 measure the voltage on the seven

application-dependent LRADC pins. The auxiliary channels can be used for

a variety of uses, including a resistor-divider-based wired remote control,

external temperature sensing, touch-screen, and other measurement

functions.

OCOTP

Controller

On-chip OTP

controller

Security

The on-chip one-time-programmable (OCOTP) ROM serves the functions of

hardware and software capability bits, Freescale operations and unique-ID,

the customer-programmable cryptography key, and storage of various ROM

configuration bits.

PINCTRL

Pin control

and GPIO

System control

peripherals

Used for general purpose input/output to external ICs. Each GPIO bank

supports 32 bits of I/O.

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.

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

Block

Mnemonic

Block Name

Subsystem

Brief Description

IMX28AEC Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc

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