參數(shù)資料
型號: DSPB56364AF100
廠商: Freescale Semiconductor
文件頁數(shù): 129/148頁
文件大?。?/td> 0K
描述: IC DSP 24BIT AUD 100MHZ 100-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: DSP56K/Symphony
類型: 音頻處理器
接口: 主機(jī)接口,I²C,SAI,SPI
時鐘速率: 100MHz
非易失內(nèi)存: ROM(24 kB)
芯片上RAM: 11.25kB
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 3.30V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-LQFP(14x14)
包裝: 托盤
Power Consumption Considerations
DSP56364 Technical Data, Rev. 4.1
Freescale Semiconductor
5-3
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 VCCP and GNDP 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 VCC
never exceeds 3.95 V.
5.3
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 (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, 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.
One 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).
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
IC V
×
f
×
=
I50 10
12
×
3.3
×
50 10
6
×
8.25mA
==
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