參數(shù)資料
型號: MC7447AVU1267LB
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(biāo)準(zhǔn)包裝: 44
系列: MPC74xx
處理器類型: 32-位 MPC74xx PowerPC
速度: 1.267GHz
電壓: 1.3V
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
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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