MCIMX280CVM4B 查看數據表（PDF） - Freescale Semiconductor

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MCIMX280CVM4B

i.MX28 Applications Processors Data Sheet for Consumer Products

Freescale Semiconductor 

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

Block

Mnemonic

PMU

PWM(8)

PXP

RTC

SAIF(2)

SPDIF

Block Name Subsystem

Brief Description

Power

Power

management management

Unit (DC-DC) system

Pulse width Connectivity

modulation peripherals

Pixel Pipeline Multimedia

Real-time

Clocks

clock, alarm,

watchdog

Serial audio Connectivity

interface

peripherals

SPDIF

Connectivity

peripherals

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

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.

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.

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 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.

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

transmits data according to the SPDIF digital audio interface standard

(IEC-60958).

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

Freescale Semiconductor

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