MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 899

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• 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: Supplier Unconfirmed

11.2.1.2 DC-DC Extended Battery Life Features
The DC-DC converter has several other power-reducing programmable modes that are
useful for maximizing battery life:
Freescale Semiconductor, Inc.
• Li-Ion Buck/Boost The Li-Ion battery configuration supports buck/boost operation,
which means that a VDDIO voltage can be supported which is higher than the input
Li-Ion battery voltage. This is important to maximize the battery life in all applications,
but is crucial in hard drives that have large transient current requirements.
(HW_POWER_5VCTRL_PWDN_5VBRNOUT=1)
HW_POWER_STS_VDD5V_GT_VDDIO=0
HW_POWER_STS_VDD5V_GT_VDDIO) &
Set up IRQ for VDDIO5V plug in.
HW_POWER_CTRL_POLARITY
HW_POWER_5VCTRL_PWDN
HW_POWER_CTRL_ENIRQ
_VDD5V_GT_VDDIO=1
_VDD5V_GT_VDDIO=1
_5VBRNOUT=1
(On falling edge of
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Reset
Unplug =
Figure 11-2. Brownout Detection Flowchart
HW_POWER_CTRL_ENIRQBATT_BO=1
reset or continue
HW_POWER_BATTMONITOR_PWDN
Do you want to
on a future
plugin?
HW_POWER_BATTMONITOR_PWDN_BATTBRNOUT=1
_BATTBRNOUT=0
Continue
HW_POWER_5VCTRL_PWDN_5VBRNOUT=1
_PWDN_5VBRNOUT=0
HW_POWER_5VCTRL
HW_POWER_5VCTRL
Unplug=1
HW_POWER_BATTMONITOR_BATT_VAL.
_ENABLE_DCDC=1
VDD5V_GT_VDDIO=1
HW_POWER_STS_
HW_POWER_BATTMONITOR_EN
Enable LRADC to measure battery
(any instance)
Set up battery brownout code.
Base State Defaults:
and put value into
Application
_BATADJ=1
ROM
Bist
Off
(PSWITCH or RTC wakeup or HW_POWER_STS_VDD5V_GT_VDDIO=1)
Brownout=1
(interrupt-driven event)
HW_POWER_5VCTRL_PWDN_5VBRNOUT=0
5V Device Plugin
HW_POWER_5VCTRL_DCDC_XFER=1
HW_POWER_BATTMONITOR_PWDN
reset or continue
Do you want to
Configure* 5V unplug detection.
HW_POWER_STS_VDD5V_GT_VDDIO=1
on a future
unplug?
_BATTBRNOUT=1
Continue
(HW_POWER_STS_VDD5V_GT_VDDIO=0) &
(HW_POWER_BATTMONITOR_PWDN
(HW_POWER_STS_BATT_BO=1)
Reset
_BATTBRNOUT=1) &
Brownout =
_PWDN_5VBRNOUT=1
HW_POWER_5VCTRL
Chapter 11 Power Supply
899