Samsung S3C2440A - Manual (Page 413)

S3C2440A RISC MICROPROCESSOR ADC AND TOUCH SCREEN INTERFACE
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ADC & TOUCH SCREEN INTERFACE
OVERVIEW
The 10-bit CMOS ADC (Analog to Digital Converter) is a recycling type device with 8-channel analog inputs. It
converts the analog input signal into 10-bit binary digital codes at a maximum conversion rate of 500KSPS with
2.5MHz A/D converter clock. A/D converter operates with on-chip sample-and-hold function and power down mode
is supported.
Touch Screen Interface can control/select pads(XP, XM, YP, YM) of the Touch Screen for X, Y position
conversion. Touch Screen Interface contains Touch Screen Pads control logic and ADC interface logic with an
interrupt generation logic.
FEATURES
— Resolution: 10-bit
— Differential Linearity Error:
±
1.0 LSB
— Integral Linearity Error:
±
2.0 LSB
— Maximum Conversion Rate: 500 KSPS
— Low Power Consumption
— Power Supply Voltage: 3.3V
— Analog Input Range: 0 ~ 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