参数资料
型号: KMC7448HX1400ND
厂商: Freescale Semiconductor
文件页数: 48/60页
文件大小: 0K
描述: IC MPU 128BIT 1400MHZ 360-FCCBGA
标准包装: 1
系列: MPC74xx
处理器类型: 32-位 MPC74xx PowerPC
速度: 1.4GHz
电压: 1.15V
安装类型: 表面贴装
封装/外壳: 360-BCBGA,FCCBGA
供应商设备封装: 360-FCCBGA(25x25)
包装: 托盘
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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