GENERAL DESCRIPTION
   The AK4187 is a 4-wire resistive touch screen controller with an integrated 12-bit SAR A/D converter, and it is capable of supporting dual touch gestures. The AK4187 can detect both the pressed screen location and touch pressure. It can also detect the dual touch center location and the parameters related to two touch points distance. The AK4187 is available in a 16pin QFN, and it is ideal for touch screens for mobile phones, DSC, DVC, smart phones, and other portable devices. And the AK4187 is available in a 16pin QFN package and a 16pin TSSOP package for automotive devices.

FEATURES
• 4-wire Touch Screen Interface
• I2C Serial Interface
• 12bit SAR A/D Converter with S/H circuit
• Dual Touch Functions
   - Dual Touch Judgment
   - Dual Touch Information Outputs
      (1) Center Location
      (2) Parameter that Related to Dual Touch Distance
• Pen Pressure Measurement
• Continuous Read Function
• Integrated Internal Osc (Sequence Mode)
• Integrated Median Averaging Filter
• Low Voltage Operation: VDD = 2.7V ~ 3.6V
                                        TVDD = 1.6V ~ 3.6V (Digital I/F)
• PENIRQN Buffer Output
• General Purpose Analog Input
• Low Power Consumption: typ. 250uA @ 450Hz
• Auto Power Down
• Ta = −40 ∼85 °C
• Package: 16pin QFN (3.0mm x 3.0mm, pitch 0.5mm)
                  16pin TSSOP (5.0mm x 4.4mm, pitch 0.65mm)