原标题：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

　　Pen Pressure Measurement (4-wire)

　　Continuous Read Function

　　Integrated Internal Osc (Sequence Mode)

　　Integrated Median Averaging Filter

　　Low Voltage Operation: VDD = 1.6V ~ 3.6V

　　PENIRQN Buffer Output

　　Low Power Consumption: 60μA at 1.8V

　　Auto Power Down

　　Package: 12pin CSP (1.7mm x 1.3mm, pitch 0.4mm)16pin QFN (3mm x 3mm, pitch 0.5mm)

　　图1。AK4186方框图

　　图2。AK4186典型连接框图(4线，AK4186ECB)

　　图3。AK4186典型连接框图(4线，AK4186EN)

　　图4。AK4186典型连接框图(5线，AK4186ECB)

　　图5。AK4186典型连接框图(5线，AK4186EN)

　　AKD4186-A评估板

　　AKD4186-A is the board for evaluation of the touch screen controller AK4186, which adopted the CSP small package suitable for the cellular phone, the handheld game machine. Since AKD4186-A has a touch-screen I/F and a digital I/O power supply input terminal, it is easily connectable with a target system of low power/voltage drive. Furthermore, since the analog input terminal is equipped analog voltage can also be measured.