參數(shù)資料
型號: XCB56364PV100
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 24-Bit Audio Digital Signal Processor
中文描述: 8-BIT, 100 MHz, OTHER DSP, PQFP112
封裝: QFP-112
文件頁數(shù): 93/162頁
文件大?。?/td> 2405K
代理商: XCB56364PV100
Design Considerations
Power Consumption Considerations
MOTOROLA
DSP56364 Advance Information
4-3
All inputs must be terminated (i.e., not allowed to float) using CMOS levels, except for the three pins
with internal pull-up resistors (TMS, TDI, TCK).
Take special care to minimize noise levels on the V
CCP
and GND
P
pins.
If multiple DSP56364 devices are on the same board, check for cross-talk or excessive spikes on
the supplies due to synchronous operation of the devices.
RESET must be asserted when the chip is powered up. A stable EXTAL signal must be supplied
before deassertion of RESET.
At power-up, ensure that the voltage difference between the 5 V tolerant pins and the chip V
CC
never exceeds 3.95 V.
4.3
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 following formula:
where
C = node/pin capacitance
V = voltage swing
f = frequency of node/pin toggle
The maximum internal current (I
CCI
max) 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 (I
CCItyp
) value reflects the average switching of the internal buses on typical operating conditions.
For applications that require very low current consumption, do the following:
Set the EBD bit when not accessing external memory.
Minimize external memory accesses and use internal memory accesses.
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.
Example 1
Current Consumption
For a Port A address pin loaded with 50 pF capacitance, operating at 3.3 V, and with a 100 MHz
clock, toggling at its maximum possible rate (50 MHz), the current consumption is
I
C
V
f
×
×
=
I
50
1012
×
3.3
×
50
×
106
×
8.25mA
=
=
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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