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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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EMC1403 датащи(PDF) 21 Page - SMSC Corporation |
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EMC1403 датащи(HTML) 21 Page - SMSC Corporation |
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21 / 42 page  1°C Temperature Sensor with Beta Compensation Datasheet SMSC EMC1403/EMC1404 21 Revision 1.16 (03-15-07) DATASHEET 5.10 Temperature Monitors In general, thermal diode temperature measurements are based on the change in forward bias voltage of a diode when operated at two different currents. This ΔV BE is proportional to absolute temperature as shown in the following equation: Figure 5.5 shows a block diagram of the temperature measurement circuit. The negative terminal for the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to ground. Figure 5.4 Temperature Filter Impulse Response where: k = Boltzmann’s constant T = absolute temperature in Kelvin [1] q = electron charge η = diode ideality factor Filter Impulse Response 0 10 20 30 40 50 60 70 80 90 02 468 10 12 14 Samples Disabled Level1 Level2 ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ = Δ LOW HIGH BE I I q kT V ln η |
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