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| 型號： | ADSP-21060KSZ-160 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/64頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP CONTROLLER 32BIT 240MQFP |
| 產(chǎn)品培訓模塊： | SHARC Processor Overview |
| 標準包裝： | 1 |
| 系列： | SHARC® |
| 類型： | 浮點 |
| 接口： | 主機接口，連接端口，串行端口 |
| 時鐘速率： | 40MHz |
| 非易失內(nèi)存： | 外部 |
| 芯片上RAM： | 512kB |
| 電壓 - 輸入/輸出： | 5.00V |
| 電壓 - 核心： | 5.00V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 240-BFQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 240-MQFP-EP（32x32） |
| 包裝： | 托盤 |
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ADSP-21060/ADSP-21060L/ADSP-21062/ADSP-21062L/ADSP-21060C/ADSP-21060LC
Rev. F
|
Page 17 of 64
|
March 2008
EXTERNAL POWER DISSIPATION (5 V)
Total power dissipation has two components, one due to inter-
nal circuitry and one due to the switching of external output
drivers. Internal power dissipation is dependent on the instruc-
tion execution sequence and the data operands involved.
Internal power dissipation is calculated in the following way:
PINT = IDDIN
u V
DD
The external component of total power dissipation is caused by
the switching of output pins. Its magnitude depends on:
the number of output pins that switch during each cycle
(O)
the maximum frequency at which they can switch (f)
their load capacitance (C)
their voltage swing (VDD)
and is calculated by:
PEXT = O
u C u V
DD
2
u f
The load capacitance should include the processor’s package
capacitance (CIN). The switching frequency includes driving
the load high and then back low. Address and data pins can
drive high and low at a maximum rate of 1/(2tCK). The write
strobe can switch every cycle at a frequency of 1/tCK. Select pins
switch at 1/(2tCK), but selects can switch on each cycle.
Example: Estimate PEXT with the following assumptions:
A system with one bank of external data memory RAM
(32-bit)
Four 128K
u 8 RAM chips are used, each with a load of
10 pF
External data memory writes occur every other cycle, a rate
of 1/(4tCK), with 50% of the pins switching
The instruction cycle rate is 40 MHz (tCK = 25 ns)
The PEXT equation is calculated for each class of pins that can
drive:
A typical power consumption can now be calculated for these
conditions by adding a typical internal power dissipation:
PTOTAL = PEXT + (IDDIN2 u 5.0 V)
Note that the conditions causing a worst-case PEXT are different
from those causing a worst-case PINT. Maximum PINT cannot
occur while 100% of the output pins are switching from all ones
to all zeros. Note also that it is not common for an application to
have 100% or even 50% of the outputs switching
simultaneously.
Table 5. External Power Calculations (5 V Devices)
Pin Type
No. of Pins
% Switching
u C
u f
u VDD2
= PEXT
Address
15
50
u 44.7 pF
u 10 MHz
u 25 V
= 0.084 W
MS0
10
u 44.7 pF
u 10 MHz
u 25 V
= 0.000 W
WR
1–
u 44.7 pF
u 20 MHz
u 25 V
= 0.022 W
Data
32
50
u 14.7 pF
u 10 MHz
u 25 V
= 0.059 W
ADDRCLK
1
–
u 4.7 pF
u 20 MHz
u 25 V
= 0.002 W
PEXT = 0.167 W
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