- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98303 > TSC2301IPAGG4 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP64 PDF資料下載
參數(shù)資料
| 型號： | TSC2301IPAGG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 49/95頁 |
| 文件大?。?/td> | 1322K |
| 代理商： | TSC2301IPAGG4 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁當前第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁
www.ti.com
OPERATION - TEMPERATURE MEASUREMENT
X+
MUX
A/D
Converter
Temperature Select
TEMP1
TEMP2
°K +
q DV
k n(N)
(7)
DV + V I82 –V I1
(8)
°K +
q DV
k n(N)
(9)
TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
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 (VBE) has
a well-defined characteristic versus temperature. The ambient temperature can be predicted in applications by
knowing the 25°C value of the VBE voltage and then monitoring the delta of that voltage as the temperature
changes.
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-A 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-A 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
相關PDF資料 |
PDF描述 |
|---|---|
| TSC2301IPAGRG4 | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TSC2302IRGZRG4 | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| TSDC4872IJT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| TS4872IJT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| TSH103ID | 3 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2301IPAGR | 功能描述:觸摸屏轉換器和控制器 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 |
| TSC2301IZQZ | 功能描述:觸摸屏轉換器和控制器 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 |
| TSC2301IZQZR | 功能描述:觸摸屏轉換器和控制器 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 |
| TSC2301PAG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
發(fā)布緊急采購，3分鐘左右您將得到回復。