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AKD4185 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems |
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AKD4185 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems |
11 / 30 page [AK4185] ■ Temperature Measurement Equation <1> describes the forward characteristics of the diode. ( ) T D V V 0 D e I i ⋅ = > < = 1 ) q kT V ( T I0: reverse saturation current q: 1.602189 ×10-19 (electron charge) k: 1.38054 ×10-23 (Boltzmann’s constant) VD: voltage across diode T: absolute temperature K The diode characteristic is approximately shown as a diode junction voltage. That is theoretically to the temperature; the ambient temperature can be predicated by knowing this voltage. Temp. Sensor TEMP0 TEMP1 I 80 1 Figure 6. Temperature Measurement As the AK4185 has two different fixed current circuits and a diode (temperature sensor), the temperature can be measured by using two different methods. The first method needs two conversions, but can derive the temperature directly without knowing the voltage at a specific temperature. From equation <1> () () ⎪⎭ ⎪ ⎬ ⎫ ⎪⎩ ⎪ ⎨ ⎧ − = = ⎟⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎝ ⎛ = ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ T V ) 80 ( V 1 V D0 D1 e 80 80 I 1 I i i 273 ) 80 ( In k q V T be ] C [ − ⋅ Δ = ⋅ ° () ( ) 80 V 1 V Vbe − = Δ 273 V 10 648 . 2 T be 3 ] C [ − Δ × × = ° The second method needs only one conversion as the following equation, but requires knowing the junction voltage at the specific temperature. > < ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ = ⋅ 2 In V q k T 0 I D i D MS0954-E-05 2010/10 - 11 - |
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