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參數(shù)資料
| 型號： | AK4180 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Touch Screen Controller |
| 中文描述： | 觸摸屏控制器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大小： | 140K |
| 代理商： | AK4180 |
[ASAHI KASEI]
[AK4180]
<MS0195-E-01>
2003/02
10
Temperature Measurement
Equation <1> describes the forward characteristics of the diode.
i
D
=I
0
exp(v
D
/V
) ( V
= kT/q) <1>
I
0
: reverse saturation current
q : 1.602189
×
10
-19
(electron charge)
k : 1.38054
×
10
-23
(Boltzmann’s constant)
v
: voltage across diode
T: absolute temperature K
The diode characteristics is approximately showed As a diode junction voltage is theoretically proportional to the temperature, the
ambient temperature can be predicted by knowing this voltage.
Temp.
Sensor
TEMP0
TEMP0
I
82I
Figure 4 Temperature Measurement
As the AK4180 has two different fixed current circuits and a diode, 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>
(i
D2
/ i
D1
) = exp{(v
(NI)
- v
(I)
)/V
T
} N = (i
D2
/ i
D1
) = 82 (ratio of the current)
T
°
C = (
Vbe * q)/(k * ln N) – 273
Vbe = V(NI) – V(I)
T
°
C = 2.63
×
10
3
×
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)* v
D
/ln(i
D
/I
0
) <2>
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