參數(shù)資料
型號(hào)： TSC2003IPWRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO16
封裝： GREEN, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 6/28頁(yè)
文件大小： 560K
代理商： TSC2003IPWRQ1
Converter
+IN
+REF
Y+
+V
DD
V
REF
X+
Y–
GND
–REF
–IN
Converter
+IN
+REF
Y+
+V
DD
X+
Y–
GND
–REF
–IN
SBAS454 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
Figure 6. Simplified Diagram of Single-Ended Reference
This situation is remedied, as shown in Figure 7, by using the differential mode: the +REF and –REF inputs are
connected directly to Y+ and Y–, respectively. This makes the ADC ratiometric. The result of the conversion is
always a percentage of the external reference, regardless of how it changes in relation to the on-resistance of
the internal switches.
Figure 7. Simplified Diagram of Differential Reference (Y Switches Enabled, X+ is Analog Input)
Differential reference mode always uses the supply voltage, through the drivers, as the reference voltage for the
ADC. VREF cannot be used as the reference voltage in differential mode.
It is possible to use a high-precision reference on VREF in single-ended reference mode for measurements which
do not need to be ratiometric (i.e., battery voltage, temperature measurement, etc.). In some cases, it could be
possible to power the converter directly from a precision reference. Most references can provide enough power
for the TSC2003, but they might not be able to supply enough current for the external load, such as a resistive
touch screen.
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TSC2003-Q1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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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
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