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参数资料
| 型号： | TSC2300IPAGRG4 |
| 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： | 29/83页 |
| 文件大小： | 1268K |
| 代理商： | TSC2300IPAGRG4 |
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t
coordinate +
2.5 ms ) 2 tPVS ) tPRE ) tSNS ) 2NAVG NBITS
1
fconv
) 4.4 ms
(3)
t
coordinate +
4.75 ms ) 3 tPVS ) tPRE ) tSNS ) 4NAVG NBITS
1
fconv
) 4.4 ms
(4)
TSC2300
SLAS372 — NOVEMBER 2002
There are three different touch screen conversion modes available in the TSC2300: self-controlled or
PENIRQ-Initiated, host-initiated, and host-controlled. These three modes are described below.
OPERATION - TOUCH SCREEN MEASUREMENTS
Conversion Controlled by TSC2300 Initiated at Touch Detect
In this mode, the TSC2300 detects when the touch panel is touched and causes the PENIRQ line to go low. At the
same time, the TSC2300 powers up its internal clock. It then turns on the Y-drivers, and after a programmed panel
voltage stabilization time, powers up the A/D converter and convert the Y coordinate. If averaging is selected, several
conversions may take place; when data averaging is complete, the Y coordinate result is stored in the Y register.
This mode is recommended to fully utilize the integrated touch screen processing of the TSC2300 and reduce the
processing overhead and number of interrupts to the host processor. In this mode, the host processor does not need to
monitor PENIRQ, instead the host needs only to configure the TSC2300 once at power-up, and then monitor DAV and
read back data after a falling edge on DAV.
If the screen is still touched at this time, the X-drivers are enabled, and the process repeats, but measures instead the
X coordinate, storing the result in the X register.
If only X and Y coordinates are to be measured, then the conversion process is complete. Figure 51 shows a flowchart
for this process. The time it takes to go through this process depends upon the selected resolution, internal conversion
clock rate, averaging selected, panel voltage stabilization time, and precharge and sense times.
The time needed to get a complete X/Y coordinate reading can be calculated by:
where
tcoordinate = time to complete X/Y coordinate reading;
tPVS = panel voltage stabilization time, as given in Table 12;
tPRE = precharge time, as given in Table 19;
tSNS = sense time, as given in Table 20;
NAVG = number of averages, as given in Table 10; for no averaging, NAVG = 1;
NBITS = number of bits of resolution, as given in Table 9;
fconv = A/D converter clock frequency, as given in Table 11.
If the pressure of the touch is also to be measured, the process continues after the X-conversion is complete,
measuring the Z1 and Z2 values, and placing them in the Z1 and Z2 registers. This process is illustrated in Figure 55.
As before, this process time depends upon the settings described above. The time for a complete X/Y/Z1/Z2
coordinate reading is given by:
35
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| TSC2301IPAG | 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 |
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