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參數資料
| 型號： | TSC2300IPAGRG4 |
| 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： | 53/83頁 |
| 文件大小： | 1268K |
| 代理商： | TSC2300IPAGRG4 |
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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
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| 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 數據速率: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 |
| TSC2301IGQZR | 功能描述:觸摸屏轉換器和控制器 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 數據速率: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 |
| TSC2301IPAG | 功能描述:觸摸屏轉換器和控制器 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 數據速率: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 |
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