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參數(shù)資料
| 型號： | TSC2300IPAGR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | Codec |
| 英文描述： | PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH AUDIO CODEC |
| 中文描述： | 可編程觸摸屏控制器與音頻編解碼器 |
| 文件頁數(shù)： | 47/81頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | TSC2300IPAGR |
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www.ti.com
X+
MUX
A/D
Converter
Temperature Select
TEMP1
TEMP2
°
K
q
V
k n(N)
(6)
V
V I82–V I1
(inmV)
2.573 V
°
K mV
(7)
°
K
°
C
2.573
V(mV)
273
°
K
(8)
TSC2300
SLAS372 — NOVEMBER 2002
In some applications, such as estimating remaining battery life or setting RAM refresh rate, a measurement of ambient
temperature is required. The temperature measurement technique used in the TSC2300 relies on the characteristics of
a semiconductor junction operating at a fixed current level. The forward diode voltage (V
) has a well-defined
characteristic versus temperature. The ambient temperature can be predicted in applications by knowing the 25
°
C
value of the V
BE
voltage and then monitoring the delta of that voltage as the temperature changes.
The TSC2300 offers two modes of temperature measurement. The first mode requires calibration at a known
temperature, but only requires a single reading to predict the ambient temperature. A diode, as shown in Figure 61, is
used during this measurement cycle. The voltage across this diode is typically 600 mV at +25
°
C while conducting a
20-μA current. The absolute value of this diode voltage can vary several millivolts, but the temperature coefficient (TC)
of this voltage is very consistent at -2.1 mV/
°
C. During the final test of the end product, the diode voltage would be
measured by the TSC2300’s ADC at a known room temperature, and the corresponding digital code stored in system
memory, for calibration purposes by the user. The result is an equivalent temperature measurement resolution of
0.3
°
C/LSB. This measurement of what is referred to as Temperature 1 is illustrated in Figure 62.
Figure 61. Functional Block Diagram of Temperature Measurement Mode.
The second mode does not require a test temperature calibration, but uses a two-measurement (differential) method to
eliminate the need for absolute temperature calibration, and achieves a 2
°
C/LSB accuracy. This mode requires a
second conversion with a current 82 times larger than the first 20uA current. The voltage difference between the first
(TEMP1) and second (Temp2) conversion, using 82 times the bias current, is represented by kT/q ln (N), where N is
the current ratio = 82, k = Boltzmann’s constant (1.38054 x 10
-23
electron volts/degree Kelvin), q = the electron charge
(1.602189 x 10
-19
C), and T = the temperature in degrees Kelvin. This method can provide much improved absolute
temperature measurement without calibration, with resolution of 2
°
C/LSB. The resultant equation for solving for
°
K is:
where
Temperature 2 measurement is illustrated in Figure 63.
47
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| TSC2301IGQZR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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