Samsung S3C2451X User Manual page 641

S3C2451X RISC MICROPROCESSOR
24
OVERVIEW
The 12-bit CMOS ADC (Analog to Digital Converter) is a recycling type device with 10-channel analog inputs. It
converts the analog input signal into 12-bit binary digital codes at a maximum conversion rate of 1MSPS with
5MHz A/D converter clock. A/D converter operates with on-chip sample-and-hold function and power down
(standby) mode is supported.
Touch screen interface can controls input pads (XP, XM, YP and YM) to obtain X/Y-positions on the external
touch screen device. Touch Screen Interface contains three main blocks; these are touch screen pads control
logic, ADC interface logic and interrupt generation logic.
FEATURES
— Resolution: 10-bit / 12-bit (controllable)
— Differential Linearity Error: ± 2.0 LSB
— Integral Linearity Error: ± 4.0 LSB
— Maximum Conversion Rate: 1 MSPS
— Low Power Consumption
— Power Supply Voltage: 3.3V
— Reference Voltage (VREF): 3.3V
— On-chip Sample-and-hold Function
— Normal Conversion Mode
— Separate X/Y position conversion Mode
— Auto (Sequential) X/Y Position Conversion Mode
— Waiting for Interrupt Mode
ADC & TOUCH SCREEN INTERFACE
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
ADC AND TOUCH SCREEN INTERFACE
24-1