- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98302 > TSC2300IPAGG4 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP64 PDF資料下載
參數(shù)資料
| 型號： | TSC2300IPAGG4 |
| 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)： | 53/81頁 |
| 文件大?。?/td> | 1039K |
| 代理商： | TSC2300IPAGG4 |
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頁第49頁第50頁第51頁第52頁當前第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
www.ti.com
R2
R1
V+
DAC
RRNG
2N3904
AOUT
ARNG
VDD
TSC2301
VBIAS
8–Bits
TSC2300
SLAS372 — NOVEMBER 2002
For example, consider an LCD that has a contrast control voltage VBIAS that can range from 2 V to 4 V, that draws
400 A when used, and has an available 5-V supply. Note that this is higher than the TSC2300 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-A load
current ILOAD is flowing from 5 V to VBIAS. This means 1 V is dropped across R1, so R1 = 1 V/400 A = 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 A. Looking at Figure 73, this means that RRNG should
be around 1 M
.
Since the voltage at the AOUT pin should 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
(11)
W R1 = 2.5 k
IMAX = 800A, ILOAD = 400A, 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 TSC2300 supply
voltage. This is not a problem, however, since V+ was within the absolute maximum ratings of the TSC2300, so no
special precautions are necessary. Many LCD displays require voltages much higher than the absolute maximum
ratings of the TSC2300. In this case, the addition of an NPN transistor, as shown in Figure 72, protects the AOUT pin
from damage.
Figure 72. DAC Circuit When Using V+ Higher Than Vsupply.
OPERATION - KEYPAD INTERFACE
57
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSC2300IPAGR | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TSC2300IPAG | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TSC2300IPAGRG4 | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TSC2301IPAGR | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TSC2301IPAG | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2300IPAGR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 20-Bit 48-Ksps I2S 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 |
| TSC2300IPAGRG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 20-Bit 48-Ksps I2S 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 |
| TSC2301 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301EVM | 功能描述:觸摸傳感器開發(fā)工具 TSC2301 Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評估: 接口類型: 工作電壓: 最大工作溫度: |
| TSC2301IGQZ | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。