MCF5272CVF66J Freescale Semiconductor, MCF5272CVF66J Datasheet - Page 294

• Manufacturer Part Number: MCF5272CVF66J
• Description: IC MCU 166MHZ 196MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5272CVF66J

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 66MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART, USB
• Peripherals: DMA, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (4K x 32)
• Program Memory Type: ROM
• Ram Size: 1K x 32
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 196-MAPBGA
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Leaded Process Compatible: No
• Rohs Compliant: No
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No

Universal Serial Bus (USB)
12.5
The recommended line interface is shown in
pull-up resistor is optional.
12.5.1
The USB specification requires that a pull-up resistor must be placed on the D+ signal for the upstream
hub to detect attachment of a full-speed device. The user may optionally want to control the attach/detach
detection by software instead of only at power on and off. With software control of the pull-up resistor, the
user has unlimited time to initialize the USB module. The software controlled pull-up resistor can be
implemented with only a few discrete components. The recommended circuit for implementing software
control of the pull-up resistor is shown in
12.5.2
The device has input protection on all pins and may source or sink a limited amount of current without
damage.
The most important considerations for PCB layout deal with noise: noise on the power supply, noise
generated by the digital circuitry on the device, and noise resulting from coupling digital signals into the
analog signals. The best PCB layout methods to prevent noise–induced problems are as follows:
12-36
•
•
•
Keep digital signals as far away from analog signals (D+ and D-) as possible.
Use short, low inductance traces for the analog circuitry to reduce inductive, capacitive, and radio
frequency noise sensitivities.
Use short, low inductance traces for digital circuitry to reduce inductive, capacitive, and radio
frequency radiated noise.
MCF5272
Line Interface
Attachment Detection
PCB Layout Recommendations
GP I/O pin
MCF5272 ColdFire
USB_D+
USB_D-
Figure 12-24. Recommended USB Line Interface
100Ω
33Ω
33Ω
®
Integrated Microprocessor User’s Manual, Rev. 3
Figure
1kΩ
Figure
12-24.
3.3 V
12-24. The transistor used to control the 1.5–kΩ
1.5kΩ±5%
Vbus
D+
D–
GND
USB
Series B
Receptacle
Freescale Semiconductor