參數(shù)資料
型號: MC8641VU1250JC
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: MICROPROCESSOR, CBGA1023
封裝: 33 X 33 MM, ROHS COMPLIANT, CERAMIC, BGA-1023
文件頁數(shù): 26/140頁
文件大小: 1484K
代理商: MC8641VU1250JC
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
121
Thermal
19.2.4
Temperature Diode
The MPC8641 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 MPC8641’s internal diode.
The following are the specifications of the MPC8641 on-board temperature diode:
Vf > 0.40 V
Vf < 0.90 V
Operating range 2–300
μA
Diode leakage < 10 nA @ 125
°C
Ideality factor over 5–150
μA at 60°C: n = 1.0275 ± 0.9%
Ideality factor is defined as the deviation from the ideal diode equation:
Another useful equation is:
Where:
Ifw = Forward current
Is = Saturation current
Vd = Voltage at diode
Vf = Voltage forward biased
VH = Diode voltage while IH is flowing
VL = Diode voltage while IL is flowing
IH = Larger diode bias current
IL = Smaller diode bias current
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)
Ifw = Is e
– 1
qVf
___
nKT
VH – VL = n
ln
KT
__
q
IH
__
IL
相關(guān)PDF資料
PDF描述
MC8641VU1250GB MICROPROCESSOR, CBGA1023
MC8641HX1333HC MICROPROCESSOR, CBGA1023
MC8641DVU1250JB MICROPROCESSOR, CBGA1023
MC8641DVU1500HB MICROPROCESSOR, CBGA1023
MC8641DHX1500GB MICROPROCESSOR, CBGA1023
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC8641VU1250K 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications
MC8641VU1250N 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications
MC8641VU1333G 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications
MC8641VU1333H 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications
MC8641VU1333J 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications