- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98301 > TSC2003IPWRQ1 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | TSC2003IPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 560K |
| 代理商： | TSC2003IPWRQ1 |
第1頁第2頁第3頁第4頁當前第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
Internal Reference
Buffer
Band
Gap
Reference
Power Down
To
CDAC
Optional
V
REF
Reference Input
Reference Mode
www.ti.com ........................................................................................................................................................................................... SBAS454 – DECEMBER 2008
The TSC2003 has an internal 2.5-V voltage reference that can be turned on or off with the power-down control
bits, PD0 and PD1 (see Table 2 and Figure 5). The internal reference is powered down when power is first
applied to the device.
The internal reference voltage is only used in the single-ended reference mode for battery monitoring,
temperature measurement, and for measuring the auxiliary input. Optimal touch screen performance is achieved
when using a ratiometric conversion; thus, all touch screen measurements are done automatically in the
differential mode.
Figure 5. Simplified Diagram of the Internal Reference
The voltage difference between +REF and –REF (see Figure 4) sets the analog input range. The TSC2003
operates with a reference in the range of 2 V to VDD. There are several critical items concerning the reference
input and its wide-voltage range. As the reference voltage is reduced, the analog voltage weight of each digital
output code is also reduced. This is often referred to as the LSB (least significant bit) size, and is equal to the
reference voltage divided by 4096 (256 if in 8-bit mode). Any offset or gain error inherent in the ADC appears to
increase, in terms of LSB size, as the reference voltage is reduced. For example, if the offset of a given
converter is 2 LSBs with a 2.5-V reference, it is typically 2.5 LSBs with a 2-V reference. In each case, the actual
offset of the device is the same, 1.22 mV. With a lower reference voltage, more care must be taken to provide a
clean layout including adequate bypassing, a clean (low noise, low ripple) power supply, a low-noise reference (if
an external reference is used), and a low-noise input signal.
The voltage into the VREF input is not buffered, and directly drives the capacitor digital-to-analog converter
(CDAC) portion of the TSC2003. Therefore, the input current is very low, typically < 6
A.
There is a critical item regarding the reference when making measurements while the switch drivers are on. For
this discussion, it is useful to consider the basic operation of the TSC2003 (see Figure 3). This particular
application shows the device being used to digitize a resistive touch screen. A measurement of the current Y
position of the pointing device is made by connecting the X+ input to the ADC, turning on the Y+ and Y– drivers,
and digitizing the voltage on X+, as shown in Figure 6. For this measurement, the resistance in the X+ lead does
not affect the conversion; it does, however, affect the settling time, but the resistance is usually small enough
that this is not a concern. However, because the resistance between Y+ and Y– is fairly low, the on-resistance of
the Y drivers does make a small difference. Under the situation outlined so far, it would not be possible to
achieve a 0-V input or a full-scale input regardless of where the pointing device is on the touch screen because
some voltage is lost across the internal switches. In addition, the internal switch resistance is unlikely to track the
resistance of the touch screen, providing an additional source of error.
Copyright 2008, Texas Instruments Incorporated
13
Product Folder Link(s): TSC2003-Q1
相關PDF資料 |
PDF描述 |
|---|---|
| TSC2003IZQCT | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PBGA48 |
| TSC2003IPWT | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| TSC2003I | 3-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| TSC2003IR | 3-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| TSC2008IRGVR | SPECIALTY CONSUMER CIRCUIT, PQCC16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2003IR | 功能描述:IC TOUCH SCREEN CNTRLLR 16-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準:- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| TSC2003IZQCR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller 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 |
| TSC2003-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:I2C TOUCH SCREEN CONTROLLER |
| TSC2004 | 制造商:BB 制造商全稱:BB 功能描述:1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire TOUCH SCREEN CONTROLLER with I2C⑩ Interface |
| TSC2004_12 | 制造商:BB 制造商全稱:BB 功能描述:1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire |
發(fā)布緊急采購，3分鐘左右您將得到回復。