Touch Screen Controller Low Voltage Operation

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The AK4182A is a 4-wire resistive touch screen controller that incorporates a 12-bit 125 kHz sampling SAR type A/D converter. The AK4182A operates down to 2.2V supply voltage and supports digital I/O interface voltage from 1.5V to VCC in order to connect low voltage uP. The AK4182A can detect the pressed screen location by performing two A/D conversions. In addition to location, the AK4182A also measures touch screen pressure. On-chip VREF can be utilized for analog auxiliary input, temperature measurement and battery monitoring with the ability to measure voltage from 0V to 5V. The AK4182A also has an on-chip temperature sensor. The AK4182A is available in 16pin QFN thin package (0.75mm in height) and has the operating temperature range of -40°C to +85°C

Key Features

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

• Low Voltage Operation (VCC = 2.2V to 3.6V)

• Low Voltage Digital I/F (1.5V to VCC)

• 4-wire I/F

• Sampling Frequency: 125 kHz (max)

• On-Chip Voltage Reference (2.5V)

• Pen Pressure Measurement

• On-Chip Thermo Sensor

• Direct Battery Measurement

• Low Power Consumption (260µA)

• Package 16pin QFN

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Block Diagram

Block Diagram

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