参数资料
型号: DSPB56367AG150
厂商: Freescale Semiconductor
文件页数: 89/100页
文件大小: 0K
描述: IC DSP 24BIT 150MHZ 144-LQFP
标准包装: 60
系列: DSP56K/Symphony
类型: 音频处理器
接口: 主机接口,I²C,SAI,SPI
时钟速率: 150MHz
非易失内存: ROM(240 kB)
芯片上RAM: 69kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.80V
工作温度: -40°C ~ 95°C
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
Power Consumption Considerations
DSP56367 Technical Data, Rev. 2.1
Freescale Semiconductor
5-3
Consider all device loads as well as parasitic capacitance due to PCB traces when calculating
capacitance. This is especially critical in systems with higher capacitive loads that could create
higher transient currents in the VCC and GND circuits.
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 DSP56367 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 3.3 V tolerant pins and the chip VCC
never exceeds a TBD voltage.
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.
Example 1. Power 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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