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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8640DEC датащи(PDF) 120 Page - Freescale Semiconductor, Inc |
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MPC8640DEC датащи(HTML) 120 Page - Freescale Semiconductor, Inc |
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120 / 140 page  MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1 120 Freescale Semiconductor Thermal 19.2.4 Temperature Diode The MPC8640 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 MPC8640’s internal diode. The following are the specifications of the MPC8640 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 |
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