Ultra Small Package I2C Touch Screen Controller for Dual Touch

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The AK4189 is a 4-wire resistive touch screen controller with an integrated 12-bit SAR A/D converter, capable of supporting dual touch gestures. The AK4189 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 AK4189 is available in a 12pin WLCSP. It is ideal for touch screens for mobile phones, DSC, DVC, smart phones, and other portable devices.

Key Features

• 4-wire Touch Screen Interface

• I2C Serial Interface

• 12bit SAR A/D Converter with S/H circuit

• Integrated Reference Resistor for Dual Touch Detection

• Dual Touch Functions

- Dual Touch Detection

- Dual Touch Information Outputs

(1) Center Location

(2) Parameter that Related to Dual Touch Distance

• Pen Pressure Measurement

• Continuous Read Function

• Integrated Internal Osc

• Integrated Median Averaging Filter

• Low Voltage Operation: VDD = 1.8V ±10%

• Touch Interruption Buffer Output

• General Purpose Analog Input

• Low Power Consumption: typ.148uA @ 450Hz

• Auto Power Down

• Ta = -40 to 85°C

• Package: 12pin WLCSP (2.0mm x 1.5mm, pitch 0.5mm)

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Block Diagram

Block Diagram

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