MCF547x ColdFire Microprocessor, Rev. 4 Freescale" />
參數(shù)資料
型號(hào)： MCF5474ZP266
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 34/34頁(yè)
文件大?。?/td> 0K
描述： IC MPU 32BIT COLDF 388-PBGA
標(biāo)準(zhǔn)包裝： 40
系列： MCF547x
核心處理器： Coldfire V4E
芯體尺寸： 32-位
速度： 266MHz
連通性： EBI/EMI，以太網(wǎng)，I²C，SPI，UART/USART，USB
外圍設(shè)備： DMA，PWM，WDT
輸入/輸出數(shù)： 99
程序存儲(chǔ)器類型： ROMless
RAM 容量： 32K x 8
電壓 - 電源 (Vcc/Vdd)： 1.43 V ~ 1.58 V
振蕩器型： 外部
工作溫度： 0°C ~ 70°C
封裝/外殼： 388-BBGA
包裝： 托盤
Hardware Design Considerations
MCF547x ColdFire Microprocessor, Rev. 4
Freescale Semiconductor
9
4.4
USB Power Filtering
To minimize noise, an external filter is required for each of the USB power pins. The filter shown in Figure 6 should be
connected between the board EVDD or IVDD and each of the USB VDD pins.
The resistor and capacitors should be placed as close to the dedicated USB VDD pin as possible.
A separate filter circuit should be included for each USB VDD pin, a total of five circuits.
All traces should be as low impedance as possible, especially ground pins to the ground plane.
The filter for USB_PHYVDD to VSS should be connected to the power and ground planes, respectively, not fingers
of the planes.
In addition to keeping the filter components for the USB_PLLVDD as close as practical to the body of the processor
as previously mentioned, special care should be taken to avoid coupling switching power supply noise or digital
switching noise onto the portion of that supply between the filter and the processor.
The capacitors for C2 in the table below should be rated X5R or better due to temperature performance.
Figure 6. USB VDD Power Filter
NOTE
In addition to the above filter circuitry, a 0.01 F capacitor is also recommended in parallel
with those shown.
Table 5 lists the resistor values and supply voltages to be used in the circuit for each of the USB VDD pins.
Table 5. USB Filter Circuit Values
USB VDD Pin
Nominal Voltage
R1 (
Ω)C1 (μF)
C2 (
μF)
USBVDD
(Bias generator supply)
3.3V
10
0.1
USB_PHYVDD
(Main transceiver supply)
3.3V
0
10
0.1
USB_PLLVDD
(PLL supply)
1.5V
10
1
0.1
USB_OSCVDD
(Oscillator supply)
3.3V
0
10
0.1
USB_OSCAVDD
(Oscillator analog supply)
1.5V
0
10
0.1
Board EVDD/IVDD
R1
C2
USB VDD Pin
C1
GND
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