參數(shù)資料
型號(hào): MC7448VU1420LC
廠(chǎng)商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 微控制器/微處理器
英文描述: 32-BIT, 1420 MHz, RISC PROCESSOR, CBGA360
封裝: 25 X 25 MM, 2.40 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, CERAMIC, BGA-360
文件頁(yè)數(shù): 48/66頁(yè)
文件大?。?/td> 793K
代理商: MC7448VU1420LC
MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
52
Freescale Semiconductor
System Design Information
9.7.4
Temperature Diode
The MPC7448 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 MPC7448’s internal diode.
The following are the specifications of the MPC7448 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)
The ratio of IH to IL is usually selected to be 10:1. The previous equation simplifies to the following:
Ifw = Is e
– 1
qVf
___
nKT
VH – VL = n
ln
– 1
KT
__
q
IH
__
IL
VH – VL = 1.986 × 10
–4 × nT
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