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)

图1.AK4186方框图

图2.4线触摸屏轴测量框图

图3.5线触摸屏轴测量框图

图4.笔压力测量框图

图5.4线触摸屏输入典型连接框图

图6.5线触摸屏输入典型连接框图

AK4186评估板Rev.1 AKD4186-A

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7.评估板AKD4186 方框图

图8.触摸屏输入电路

图9.评估板AKD4186 电路图