MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 917

• 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

11.12.3 DC-DC Minimum Power and Miscellaneous Control Register
This register controls options to drop the power used by the switching DC-DC converter.
These bits should only be modified with guidance from Freescale.
HW_POWER_MINPWR: 0x020
HW_POWER_MINPWR_SET: 0x024
HW_POWER_MINPWR_CLR: 0x028
HW_POWER_MINPWR_TOG: 0x02C
Freescale Semiconductor, Inc.
PWRUP_VBUS_
ENABLE_DCDC
LINREG_ILIMIT
DCDC_XFER
VBUSVALID_
VBUSVALID_
ILIMIT_EQ_
5VDETECT
ENABLE_
CMPS
ZERO
TO_B
Field
6
5
4
3
2
1
0
(HW_POWER_MINPWR)
Enable the current limit in the linear regulators. The current limit is active during powerup from 5v and
automatically disables before the ROM executes. This limit is needed to meet the USB in rush current
specification of 100mA + 50uC. Note this linear regulator current limit is not related to the
CHARGE_4P2_ILIMIT.
Enable automatic transition to switching DC-DC converter when VDD5V is removed. The LRADC must be
operational and the BATT_VAL field must be written with the battery voltage using 8-mV step-size. It is also
important to set the EN_BATADJ field.
Power up and use VBUSVALID comparator as detection circuit for 5V in the switching converter. The
VBUSVALID comparator provides a more accurate and adjustable threshold to determine the presence of
5V in the system, and is the recommended method of detecting 5V.
This bit muxes the Bvalid comparator to the VBUSVALID comparator and is used for test purposes only.
The amount of current the device will consume from the 5V rail is minimized. The VDDIO linear regulator
current limit is set to zero mA. Also, the source of current for the crystal oscillator and RTC is switched to
the battery. Note that this functionality does not affect battery charge.
Powers up comparators for 5v
Enables the switching DC-DC converter when 5V is present. It is recommended to set ILIMIT_EQ_ZERO,
ENABLE_ILIMIT, and all LINREG_OFFSET bits when enabling this functionality.
HW_POWER_5VCTRL field descriptions (continued)
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Description
Chapter 11 Power Supply
917