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參數(shù)資料
| 型號： | MC7447AVU867NB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 44/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU RISC 32BIT 360-BGA |
| 標準包裝： | 44 |
| 系列： | MPC74xx |
| 處理器類型： | 32-位 MPC74xx PowerPC |
| 速度： | 867MHz |
| 電壓： | 1.1V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 360-BCBGA，F(xiàn)CCBGA |
| 供應(yīng)商設(shè)備封裝： | 360-FCCBGA（25x25） |
| 包裝： | 托盤 |
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MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
49
System Design Information
9.8.4
Temperature Diode
The MPC7447A has a temperature diode on the microprocessor that can be used in conjunction with other
system temperature monitoring devices (such as Analog Devices, ADT7461). These devices use the
negative temperature coefficient of a diode operated at a constant current to determine the temperature of
the microprocessor and its environment. For proper operation, the monitoring device used should
auto-calibrate the device by canceling out the VBE variation of each MPC7447A’s internal diode.
The following are the specifications of the MPC7447A on-board temperature diode:
0.40 V <Vf <0.90 V
Operating range 2–300
μA
Diode leakage < 10 nA @ 125 C
Ideality factor (n) over 5–150
μA @ 60 C: 1.0275 ± 0.9 %
Ideality factor is defined as the deviation from the ideal diode equation:
Where:
Ifw = Forward current
Is = Saturation current
Vd = Voltage at diode BM: this does not show up in any equations.
Vf = Voltage forward biased
q = Charge of electron (1.6 x 10 -19 C)
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38 x 10-23 Joules/K)
T = Temperature (Kelvins)
Another useful equation is :
Where:
VH = Diode voltage while IH is flowing
VL = Diode voltage while IL is flowing
IH = Larger diode bias current
IL = Smaller diode bias current
Ifw = Is e
– 1
qVf
___
nKT
VH – VL = n
ln
KT
__
q
IH
__
IL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC7447RX1000LB | 制造商:Motorola Inc 功能描述: |
| MC7447RX1000NB | 制造商:Freescale Semiconductor 功能描述:IC, 32BIT MPU, 1000MHZ, BGA-360, Series:(Power) HOST MPU, Core Size:32bit, Progr |
| MC7447RX600NB | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PPC7457RX1000NB |
| MC7447RX733NB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC7447RX867NB | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PPC7457RX1000NB |
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