- 您现在的位置：买卖IC网 > PDF目录98302 > TSC2300IPAGG4 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP64 PDF资料下载
参数资料
| 型号： | TSC2300IPAGG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 53/81页 |
| 文件大小： | 1039K |
| 代理商： | TSC2300IPAGG4 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页当前第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页
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
相关PDF资料 |
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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TSC2300IPAGR | 功能描述:触摸屏转换器和控制器 20-Bit 48-Ksps I2S Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| TSC2300IPAGRG4 | 功能描述:触摸屏转换器和控制器 20-Bit 48-Ksps I2S Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| TSC2301 | 制造商:TI 制造商全称:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301EVM | 功能描述:触摸传感器开发工具 TSC2301 Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于评估: 接口类型: 工作电压: 最大工作温度: |
| TSC2301IGQZ | 功能描述:触摸屏转换器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
发布紧急采购，3分钟左右您将得到回复。