參數(shù)資料
型號(hào)： AK4181A
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： TOUCH SCREEN CONTROLLER
中文描述： 觸摸屏控制器
文件頁(yè)數(shù)： 2/17頁(yè)
文件大?。?/td> 188K
代理商： AK4181A
ASAHI KASEI
[AK4181A]
MS0313-E-00
2004/06
10
Temperature Measurement
Equation <1> describes the forward characteristics of the diode.
iD=I0exp(vD/VT) ( VT = kT/q)
<1>
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 proportional to the temperature;
the ambient temperature can be predicted by knowing this voltage.
Temp.
Sensor
TEMP0
TEMP1
I
82I
Figure 5 Temperature Measurement
As the AK4181A 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>
(iD2 / iD1) = exp{(v(NI) - v(I))/VT}
N = (iD2 / iD1) = 82 (ratio of the current)
T
°C = (Vbe * q)/(k * ln N) – 273
Vbe = V(82I) – V(I)
T
°C = 2.63×103 × Vbe – 273
The second method needs only one conversion as the following equation, but requires knowing the junction voltage at the specific
temperature.
T = (k/q)* vD/ln(iD/I0)
<2>
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