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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： | 13/83頁 |
| 文件大小： | 1268K |
| 代理商： | TSC2300IPAGRG4 |
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High Except
When TEMP1,
TEMP2 Activated
Internal
50 kW
VDD
PENIRQ
VDD
TEMP1
TEMP2
TEMP DIODE
Y+ or X+ Drivers on,
or TEMP1, TEMP2
Measurements Activated
Y+
X+
Y–
ON
TSC2300
SLAS372 — NOVEMBER 2002
Variable Resolution
The TSC2300 provides three different resolutions for the A/D converter: 8, 10 or 12 bits. Lower resolutions are often
practical for measurements such as touch pressure. Performing the conversions at lower resolution reduces the
amount of time it takes for the A/D converter to complete its conversion process, which lowers power consumption.
Conversion Clock and Conversion Time
The TSC2300 contains an internal 8-MHz clock, which is used to drive the state machines inside the device that
perform the many functions of the part. This clock is divided down to generate the actual A/D conversion clock. The
division ratio for this clock is set in the A/D converter control register. The ability to change the conversion clock rate
allows the user to choose the optimal value for resolution, speed, and power. If the 8-MHz clock is used directly, the
A/D converter is limited to 8-bit resolution; using higher resolutions at this speed will not result in accurate conversions.
Using a 4-MHz conversion clock is suitable for 10-bit resolution; 12-bit resolution requires that the conversion clock run
at 1 or 2 MHz.
Regardless of the conversion clock speed, the internal clock runs nominally at 8 MHz. The conversion time of the
TSC2300 is dependent upon several functions. While the conversion clock speed plays an important role in the time it
takes for a conversion to complete, a certain number of internal clock cycles is needed for proper sampling of the
signal. Moreover, additional times, such as the panel voltage stabilization time, can add significantly to the time it takes
to perform a conversion. Conversion time can vary depending upon the mode in which the TSC2300 is used.
Throughout this data sheet, internal and conversion clock cycles are used to describe the times that many functions
take. In considering the total system design, these times must be taken into account by the user.
Touch Detect
The pen interrupt (PENIRQ) output function is detailed in Figure 49. While in the touch screen monitoring mode, the Y-
driver is ON and connected to GND, the X+ input is connected through a pullup resistor to VDD, and the PENIRQ output
reflects the state of the X+ input. When the panel is touched, the X+ input is pulled to ground through the touch screen
and PENIRQ output goes LOW due to the current path through the panel to GND, initiating an interrupt to the
processor. During the measurement cycles for X- and Y-position, the X+ input is disconnected from PENIRQ to
eliminate any leakage current from the pullup resistor that might flow through the touch screen, thus causing no errors.
Figure 49. PENIRQ Functional Block Diagram.
20
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| 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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