參數(shù)資料
型號(hào)： TSC2302IRGZ
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(yè)數(shù)： 56/81頁(yè)
文件大?。?/td> 1211K
代理商： TSC2302IRGZ
www.ti.com
300
200
100
0
10 k
100 k
1 M
10 M
100 M
D
400
500
RRNG Resistor Value
DAC FULLSCALE OUTPUT CURRENT
vs
RRNG RESISTOR VALUE
600
μ
1000
900
800
700
TSC2302
SLAS394–JULY 2003
Figure 66. DAC Output Current Range vs RRNG Resistor Value
For example, consider an LCD that has a contrast control voltage VBIAS that can range from 2 V to 4 V, that
draws 400 μA when used, and has an available 5-V supply. This is higher than the TSC2302 supply voltage, but
it is within the absolute maximum ratings.
The maximum VBIAS voltage is 4 V, and this occurs when the D/A converter current is 0, so only the 400-μA
load current ILOAD is flowing from 5 V to VBIAS. This means 1 V is dropped across R1, so R1 = 1 V/400 μA =
2.5 k
.
The minimum VBIAS is 2 V, which occurs when the D/A converter current is at its full scale value, IMAX. In this
case, 5 V - 2 V = 3 V is dropped across R1, so the current through R1 is 3 V/2.5 k
= 1.2 mA. This current is
IMAX + ILOAD = IMAX + 400 uA, so IMAX must be set to 800 μA. This means that RRNG should be around 1
M
.
Since the voltage at the AOUT pin must not go below 1.5 V, this limits the voltage at the bottom of R2 to be
1.5-V minimum; this occurs when the D/A converter is providing its maximum current, IMAX. In this case, IMAX
+ILOAD flows through R1, and IMAX flows through R2. Thus,
R2 x IMAX + R1(IMAX + ILOAD) = 5 V - 1.5 V = 3.5 V
(12)
W R1 = 2.5 k
IMAX = 800μA, ILOAD = 400μA, thus allowing R2 to be solved as 625
.
In the previous example, when the DAC current is zero, the voltage on the AOUT pin rises above the TSC2302
supply voltage. This is not a problem, however, since V+ was within the absolute maximum ratings of the
TSC2302, so no special precautions are necessary. Many LCD displays require voltages much higher than the
absolute maximum ratings of the TSC2302. In this case, the addition of an NPN transistor, as shown in Figure
67, protects the AOUT pin from damage.
56
相關(guān)PDF資料
PDF描述
TSC2302IRGZR PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC
TSC87C51 CMOS 0 to 25 MHz Programmable 8?bit Microcontroller
TSC87C51-25MGMQ CMOS 0 to 25 MHz Programmable 8?bit Microcontroller
TSC87C51-25MIMQ CMOS 0 to 25 MHz Programmable 8?bit Microcontroller
TSC87C51-25MJMQ CMOS 0 to 25 MHz Programmable 8?bit Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSC2302IRGZG4 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
TSC2302IRGZR 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
TSC2302IRGZRG4 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
TSC2303IZQZ 制造商:Texas Instruments 功能描述:
TSC2303IZQZR 制造商:Texas Instruments 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*