AKM AK4186 4（5）线电阻触摸屏控制方案
AKM 公司的AK4186是采用12位SAR ADC的 4线/5线电阻触摸屏控制器，具有自动连续测量和测量数据计算功能以及连续读出功能，I2C串行接口，取样速率22.2kHz，工作电压1.6V-3.6V，1.8V的功耗为60uA，并具有自动关机功能。主要用在手机，数码相机，DVC和智能手机以及其它手提设备。本文介绍了AK4186主要特性，方框图，4线和5线典型连接框图，触摸屏输入电路以及AKD4186-A评估板电路图。
The AK4186 is a 4-wire/ 5-wire resistive touch screen controller that incorporates 12bit SAR A/D converter. The AK4186 can detect the pressed screen location with two A/D conversions and it can also measure touch pressure. The AK4186 has both an automatic continuous measurement and a measurement data calculation function. The functions that normally require external processing, such as calculating the average screen input value, are processed by the AK4186. In addition, a new sequential mode achieves short coordinate measurement time while greatly reducing the microprocessor overhead. The AK4186 operates off of supply voltage down to 1.6V in order to connect a low voltage microprocessor. The AK4186 is the best fit for cellular phone, DSC, DVC, smart phone and other portable devices.
AK4186主要特性：
4-wire or 5-wire Touch Screen Interface
I2C Serial Interface
12bit SAR A/D Converter with S/H circuit
Sampling Rate: 22.2kHz
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