AK4186设计的电阻触摸屏控制方案

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。

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。

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.

图6。触摸屏输入电路

图7。AKD4186-A评估板电路图