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參數(shù)資料
| 型號： | AK4182 |
| 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)： | 10/18頁 |
| 文件大小： | 198K |
| 代理商： | AK4182 |
ASAHI KASEI
[AK4182]
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 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.
MS0411-E-00
2005/08
10
Temp.
Sensor
TEMP0
TEMP1
iD1
= I
iD2
= 91 x I
Figure 5 Temperature Measurement
As the AK4182 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>
(i
D2
/ i
D1
) = exp {(v
(91 x I)
- v
(I)
)/V
T
} N = (i
D2
/ i
D1
) = 91 (ratio of the current)
T
°
C = (
Vbe * q)/(k * ln N) – 273
Vbe = V (91 x I) – V (I)
T
°
C = 2.573
×
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>
相關PDF資料 |
PDF描述 |
|---|---|
| AK4182VN | Touch Screen Controller |
| AK4183 | I2C Touch Screen Controller |
| AK4183VT | I2C Touch Screen Controller |
| AK4184 | TSC with Keypad Scanner and GPIO Expander |
| AK4184VG | TSC with Keypad Scanner and GPIO Expander |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AK4182A | 制造商:AKM 制造商全稱:AKM 功能描述:touch screen controller |
| AK4182AVN | 制造商:AKM 制造商全稱:AKM 功能描述:Touch Screen Controller |
| AK4182VN | 制造商:AKM 制造商全稱:AKM 功能描述:Touch Screen Controller |
| AK4183 | 制造商:AKM 制造商全稱:AKM 功能描述:I2C Touch Screen Controller |
| AK4183_08 | 制造商:AKM 制造商全稱:AKM 功能描述:I2C Touch Screen Controller |
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