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參數(shù)資料
| 型號(hào)： | TSC2301IGQZ |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | Codec |
| 英文描述： | PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| 中文描述： | 可編程觸摸屏控制器，立體聲編解碼器 |
| 文件頁數(shù)： | 53/92頁 |
| 文件大?。?/td> | 1161K |
| 代理商： | TSC2301IGQZ |
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www.ti.com
OPERATION - TEMPERATURE MEASUREMENT
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 TSC2301 relies on the
characteristics of a semiconductor junction operating at a fixed current level. The forward diode voltage (V
BE
) 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.
X+
MUX
A/D
Converter
Temperature Select
TEMP1
TEMP2
°
K
q
V
k n(N)
(7)
V
V I82–V I1
(8)
°
K
q
V
k n(N)
(9)
TSC2301
SLAS371D–SEPTEMBER 2002–REVISED AUGUST 2004
The TSC2301 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 TSC2301 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 20-μA 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:
(in mV)
Temperature 2 measurement is illustrated in
Figure 63
.
53
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TSC2301IPAG | 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 |
| TSC2301IPAGG4 | 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 |
| TSC2301IPAGR | 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 |
| TSC2301IPAGRG4 | 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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