MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 900

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

Linear Regulators
The DC-DC converter can be programmed to run off of the battery or the 4.2 V regulated
voltage supply. It can be set up to opportunistically draw power from either source. This
allows the system to draw up to the USB current limit from the 5 V supply and take the
balance of the required power from the battery.
11.3 Linear Regulators
The i.MX28 integrates four linear regulators that can be used to directly power the supply
rails when 5 V is present. All of these regulators have an output impedance of approximately
one-quarter ohm. This means that the measured output voltage will be slightly dependent
on the current consumed on each supply. Architecturally, one regulator generates VDDIO
from the VDD5V pin, one generates VDDA from VDDIO, one generates VDDMEM from
VDDA, and the other generates VDDD from the VDDA supply. Therefore, all of the current
is supplied by the VDD5V->VDDIO regulator.
900
• Transient Loading Optimizations Several new incremental improvements have
• Pulse Frequency Modulation (PFM) PFM, also known as pulse-skipping mode, is
• DC-DC Switching Frequency The standard DC-DC switching frequency is 1.5 MHz,
• DC-DC Converter Power Down If the system is to operate from linear regulators
been made to the control architecture of the switching converters. At this time, Freescale
recommends setting the following bits through software in HW_POWER_LOOPCTRL
to obtain maximum efficiency and minimum supply ripple: TOGGLE_DIF,
EN_CM_HYST and EN_RCSCALE=0x1. Also, set
HW_POWER_BATTMONITOR_EN_BATADJ. The complete settings to optimize
transient loading will be dependent on the application, component selection and board
layout.
used to reduce power consumed by the DC-DC converter when the voltage outputs are
lightly-loaded at a cost of higher transient noise. The DC-DC converter can be separately
placed in PFM mode through the EN_DC_PFM bit in HW_POWER_MINPWR.
which provides a good mix of efficiency and power output. The frequency can be
reduced to 750 KHz to reduce operating current in some light load situations through
DC_HALFCLK in HW_POWER_MINPWR. The DC-DC converter can also be
programmed to a frequency that is based on PLL using the SEL_PLLCLK and
FREQSEL fields in the HW_POWER_MISC register.
or an external power supply, then the internal DC-DC converters can be powered down
through DC_STOPCLK in HW_POWER_MINPWR. This bit is not intended to power
down the whole system. Use the HW_POWER_RESET bits to power the system off.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Freescale Semiconductor, Inc.