MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 102

• 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

i.MX28 Product Features
1.3.10 Power Management Unit
The i.MX28 contains a sophisticated Power Management Unit (PMU), including one
integrated DC-DC converter, four linear regulators, one regulated 4.2 V output and battery
chargers. The PMU can operate from a Li-Ion battery using the DC-DC converters or a 5-V
supply using the linear regulators and can automatically switch between them without
interrupting the operation. The PMU includes circuits for battery and system voltage
brownout detection, as well as the on-chip temperature, digital speed, and process monitoring.
In addition, there exist safety features such as thermal shut-down and battery charge current
cut-off based on the external thermistor (through LRADC). The integrated PMU converter
can be used to provide programmable power for the device as well as the entire application
on up to five rails:
The 4.2 V regulated output also allows the programmable current limits:
The 4.2 V circuit is capable of adjusting distribution of current supply between the load and
the battery-charger depending on the programmed current-limits and the load conditions.
For example, when the battery charging exceeds the 5 V current limit, the 4.2 V regulator
steals the current from the battery-charger circuit and diverts it to the load circuit. The
converter can be configured to operate from the standard Li-Ion battery up to 4.2 V. These
converters use off-chip reactive components (L/C) in a pulse-width or frequency-modulated
DC-DC converter. The real-time clock includes an alarm function that can be used to
wake-up the DC-DC converters, which then wakes up the rest of the system.
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• VDD4P2 (nominal 4.2 V) -- when connected to 5 V source, can source the DC-DCs
• VDDIO (nominal 3.3 V) -- DC-DC or linear-regulator from 5 V
• VDDA (nominal 1.8 V) -- DC-DC or linear-regulator from VDDIO
• VDD1P5 (nominal 1.5 V) -- linear-regulator from VDDIO for LVDDR2
• VDDD (nominal 1.2 V) -- DC-DC or linear-regulator from VDDA
• Total load plus battery charge current (5 V limit)
• Battery charge current
• Load current -- for both on-chip and off-chip circuits
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Freescale Semiconductor, Inc.