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MCF53015CMJ240 数据表(PDF) 6 Page - Freescale Semiconductor, Inc |
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MCF53015CMJ240 数据表(HTML) 6 Page - Freescale Semiconductor, Inc |
6 / 62 page MCF5301x Data Sheet, Rev. 5 Preliminary—Subject to Change Without Notice Hardware Design Considerations Freescale Semiconductor 6 Figure 1. System PLL VDD Power Filter 3.2 USB Power Filtering To minimize noise, external filters are required for each of the USB power pins. The filter shown in Figure 2 should be connected between the board EVDD and each of the USBVDD pins. The resistor and capacitors should be placed as close to the dedicated USBVDD pin as possible. Figure 2. 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. 3.3 Supply Voltage Sequencing Figure 3 shows situations in sequencing the I/O VDD (EVDD), SDRAM VDD (SDVDD), PLL VDD (PVDD), and internal logic / core VDD (IVDD). The relationship between SDVDD and EVDD is non-critical during power-up and power-down sequences. Both SDVDD (2.5V or 1.8V) and EVDD are specified relative to IVDD. Board IVDD 10 Ω 0.1 µF PLL VDD Pin 10 µF GND Board EVDD 0 Ω 0.1 µF USB VDD Pin 10 µF GND |
类似零件编号 - MCF53015CMJ240 |
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类似说明 - MCF53015CMJ240 |
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