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參數(shù)資料
| 型號(hào)： | MC56603APV60 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | 24-BIT, 60 MHz, OTHER DSP, PQFP144 |
| 封裝： | PLASTIC, TQFP-144 |
| 文件頁數(shù)： | 88/97頁 |
| 文件大?。?/td> | 1080K |
| 代理商： | MC56603APV60 |
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DSP56603A
Power Consumption Considerations
MOTOROLA
DSP56603A Technical Data Sheet
4-5
The Typical Internal Current value (ICCI) reflects the typical switching of the internal
buses in a typical DSP-intensive application.
For applications requiring very low current consumption, it is recommended to:
Set the PCD bit (in the OMR) and do not use the PC-relative instructions.
Set the EBD bit (in the OMR) when not accessing external memory
Minimize external memory accesses and use internal memory accesses
instead
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 (e.g., CLKOUT, XTAL)
A common way to evaluate power consumption is to use a current per MIPS
measurement methodology to minimize specific board effects (i.e., to compensate for
measured board current not caused by the DSP). A benchmark power consumption
test algorithm is listed in Appendix A. Use the test algorithm and measure the
current consumption at two different frequencies, F1 and F2. Then use the following
equation to derive the current per MIPS value:
Equation 5:
where: ItypF2 = current at F2
ItypF1 = current at F1
F2
=
high frequency (any specified operating frequency)
F1
=
low frequency (any specified operating frequency lower than F2)
Note:
F1 should be significantly less than F2. For example, F2 could be 60 MHz and
F1 could be 30 MHz. The degree of difference between F1 and F2 determines
the amount of precision with which the current rating can be determined for
an application.
Example 4-1
Current Consumption
For a Port A address pin loaded with 50 pF capacitance, operating at 2.7 V, and with a 60 MHz clock,
toggling at its maximum possible rate of 15 MHz, the current consumption is (for this pin only):
Equation 4:
I = 50
10-12 2.7 15 106 = 2.025 mA
I MIPS
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I MHz
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I
typF2
I
typF1
() F2 F1
()
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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