MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 16

• 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

ESD and Radiated Emissions
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— A ground plane should be placed under the TX/RX pairs between the ethernet PHY and
— A separate ethernet chassis ground should be placed under the RJ45 jack.
— The chassis ground should be connected to the rest of the PCB GND with capacitor stuffing
— An example drawing is shown below.
ESD and Radiated Emissions
Ideally, the PCB design should use 6 or more layers, with solid power and ground planes. With 4
layers, ESD immunity and radiated emissions performance may be compromised.
All components with ground chassis shields (USB jack, buttons, etc.) should connect the shield to
the PCB chassis ground ring.
Ferrite beads should be placed on each signal line connecting to an external cable (except for USB
- see below). These ferrite beads must be placed as close to the PCB jack as possible.
Ferrite beads should NOT be placed on the USB D+/D- signal lines as this can cause USB signal
integrity problems. For radiated emissions problems due to USB, a common mode choke may be
placed on the D+/D- signal lines. However, in most cases, it should not be required if the PCB
layout is satisfactory. Ideally, the common mode choke should be approved for high speed USB
use or tested thoroughly to verify there are no signal integrity issues created.
integrated RJ45 jack.
options, which is useful for determining which values and location will provide the best EMI
performance.
i.MX28 Layout and Design Guidelines, Rev. 0
Freescale Semiconductor