GENERAL DESCRIPTION
The AK4184 is a 12-bit A/D converter witch operates 125kHz (max) sampling rate with a 4-wire resistive touch screen controller (TSC), including low-on resistance switches, touch pressure measurement capability, a maximum 6 x 5 keypad scanner, eight GPIO ports, and a PWM generator for LED contrast control. The AK4184 operates down to a 2.5V supply voltage, and it tolerates digital I/O interface voltage from 1.6V to AVDD in order to connect to low voltage controllers. The AK4184 supports SPI interface for communication to a host controller. The AK4184 is available in a 41-pin BGA package and it operates over a temperature range of -40°C to +85°C. The AK4184 is suitable for Cellular Phone, DSC, DVC, Smart Phone and MP3 player application systems.

FEATURES
SPI Serial Interface
12 bit SAR A/D Converter with S/H Circuit
4-wire Resistive Touch Screen Interface
Sampling Frequency: 125 kHz (max)
Pen Pressure Measurement
6 x 5 Keypad Scanner
8 GPIO Ports
PWM Generator for LED Bias Control
Power Supply:
   AVDD = 2.5V ∼3.6V
   IOVDD = 1.6V ∼AVDD (Digital I/F)
Low Power Consumption (400μA)
Package: 
   41pin BGA (4mm x 4mm, pitch 0.5mm)