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参数资料
| 型号： | MK712SLFTR |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 19/21页 |
| 文件大小： | 0K |
| 描述： | IC TOUCH SCREEN CTLR 28-SOIC |
| 标准包装： | 1,000 |
| 类型： | 电阻 |
| 触摸面板接口： | 4 线 |
| 输入数/键： | 1 TSC |
| 分辨率（位）： | 12 b |
| 数据接口： | 并联 |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 5mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC |
| 包装： | 带卷 (TR) |
MK712
TOUCH SCREEN CONTROLLER
TOUCH SCREEN CONTROL
IDT TOUCH SCREEN CONTROLLER
7
MK712
REV N 051310
Optimizing Performance when Reading and Writing Registers
Reading and writing the MK712 generates digital noise that may reduce the accuracy of the A to D converter. This
noise has several causes, including board layout, data bus loading, and power supply voltage. By appropriately
timing the register operations, the effects of this noise can be minimized.
After an interrupt is issued, the MK712 allows a minimum of 1 millisecond to elapse before initiating the conversion
cycle. This allows the screen drivers to settle. For best performance, complete all register operations within this 1ms
window after an interrupt.
Power Down/Stopping the Clock
If the screen is untouched, the supply current is under 3A. If the input clock is stopped, the supply current is also
less than 3A. When the screen is touched with no clock, TOUCH goes low and INT goes high, but no further
operations occur until the clock starts. A to D conversions are invalid until after the clock has stabilized at the correct
frequency and one full conversion cycle has been completed.
Input Clock
The MK712 is highly tolerant of different clock frequencies (from 12 to 20 MHz), rise times, and duty cycles.
However, any input clock undershoot or overshoot will cause the MK712 to draw extra current. This can be
eliminated by using a MicroClock clock synthesizer and properly terminating the clock driver. MicroClock makes low
power clock synthesizers with 14.3 MHz power down.
Resistive Touch Screen (4-wire)
Resistive touch screens consist of 2 resistive plates that are separated by a small gap. Each plate has an electrode
at each end and when the screen is touched, the two plates are shorted together at that point.
If a voltage is applied, for example, between XL and XH, then a voltage divider is formed on the X PLATE. When the
Y PLATE is touched to the X PLATE, a voltage will be developed on the Y PLATE that is proportional to distance of
the touch from XL and XH. By accurately measuring this voltage, the position of the touch can be determined.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MK712STR | 功能描述:IC TOUCH SCREEN CTLR 28-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 触摸屏控制器 系列:- 标准包装:96 系列:- 类型:- 触摸面板接口:- 输入数/键:- 分辨率（位）:- 评估套件:* 数据接口:- 数据速率/采样率 (SPS，BPS):- 电压基准:- 电源电压:- 电流 - 电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| MK715 | 制造商:ICS 制造商全称:ICS 功能描述:Touch Screen Controller |
| MK7151F | 制造商:Ohmite Mfg Co 功能描述: |
| MK715R | 制造商:ICS 制造商全称:ICS 功能描述:Touch Screen Controller |
| MK715RTR | 制造商:ICS 制造商全称:ICS 功能描述:Touch Screen Controller |
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