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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSP56004ROM датащи(PDF) 78 Page - Freescale Semiconductor, Inc |
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DSP56004ROM датащи(HTML) 78 Page - Freescale Semiconductor, Inc |
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78 / 82 page  4-4 DSP56004/D, Rev. 3 MOTOROLA Design Considerations Power Consumption Considerations POWER CONSUMPTION CONSIDERATIONS Power dissipation is a key issue in portable DSP applications. Some of the factors which affect current consumption are described in this section. Most of the current consumed by CMOS devices is Alternating Current (AC), which is charging and discharging the capacitances of the pins and internal nodes. Current consumption is described by the formula: Equation 3: where: C = node/pin capacitance V = voltage swing f = frequency of node/pin toggle The Maximum Internal Current (ICCImax) value reflects the typical possible switching of the internal buses on best-case operation conditions, which is not necessarily a real application case. The Typical Internal Current (ICCItyp) value reflects the average switching of the internal buses on typical operating conditions. For applications that require very low current consumption: • Minimize the number of pins that are switching. • Minimize the capacitive load on the pins. • Connect the unused inputs to pull-up or pull-down resistors. • Disable unused peripherals. • Disable unused pin activity. Example 4-1 Current Consumption For an I/O pin loaded with 50 pF capacitance, operating at 5.5 V, and with a 81 MHz clock, toggling at its maximum possible rate (20 MHz), the current consumption is: Equation 4: I CVf × × = I50 10 12 – × 5.5 × 20 × 10 6 × 5.5mA == Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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