參數(shù)資料
型號: MSC8103M1200F
廠商: MOTOROLA INC
元件分類: 數(shù)字信號處理
英文描述: 64-BIT, 75 MHz, OTHER DSP, PBGA332
封裝: 17 X 17 MM, FLIP-CHIP, PLASTIC, BGA-332
文件頁數(shù): 15/120頁
文件大小: 1952K
代理商: MSC8103M1200F
4-3
Power Considerations
To determine a total power dissipation in a specific application, you must add the power values derived
from the above set of equations to the value derived for I/O power consumption using the following
equation for each output pin:
Equation 2: P = C
× V
DDH
2
× f × 10–3
Where: P = power in mW, C = load capacitance in pF, f = output switching frequency in MHz.
For an application in which external data memory is used in a 32-bit single bus mode and no other
outputs are active, the core runs at 200 MHz, the CPM runs at 100 MHz and the SIU runs at 50 MHz,
power dissipation is calculated as follows:
Assumptions:
External data memory is accessed every second cycle with 10% of address pins switching.
External data memory writes occurs once every eight cycles with 50% of data pins switching.
Each address and data pin has a 30 pF total load at the pin.
The application operates at VDDH = 3.3 V.
Since the address pins switch once at every second cycle, the address pins frequency is a quarter of the
bus frequency (that is, 25 MHz).
For the same reason the data pins frequency is 3.125 MHz.
Calculating internal power (from Table 2-5 values):
PCORE (200) = ((PCORE – PLCO)/300) × 200 + PLCO =((450 – 3) / 300 × 200 + 3 = 301
PCPM (100) = ((PCPM – PLCP) / 200) × 100 + PLCP = ((320 – 6) / 200) × 100 + 6 = 163
PSIU (50) = ((PSIU – PLSI) / 100) × 50 + PLSI = ((80 – 2) / 100) × 50 + 2 = 41
PINT = PCORE(200) + PCPM(100) + PSIU(50) = 301 + 163 + 41 = 505
PD = PINT + PI/O = 505 + 67 = 572
Maximum allowed ambient temperature is:
TA = TJ – (PD × θJA)
Table 4-1. Power Dissipation
Pins
# of pins
switching
× C
× V
DDH
2
× f × 10–3
Power in mW
Address
Data, HRD, HRW
CLKOUT
4
34
1
× 30
× 3.32
× 12.5 × 10–3
× 3. 125 × 10–3
× 50 × 10–3
16.25
34.75
16
Total PI/O
67
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