S3C24A0 Datasheet, PDF (436/487 Pages) Samsung semiconductor – APPLICATION PROCESSOR FOR 2.5G/3G MOBILE PHONES

BSW rv0.1-0417-N01
S3C24A0 RISC MICROPROCESSOR
A/D CONVERTER AND TOUCH SCREEN
EXAMPLE for touch screen
In this example, AIN[7] is connected with XP and AIN[5] is connected with YP pad of touch screen panel.
To control pads of touch screen panel (XP, XM, YP and YM), 4 internal transistor are applied and control signals,
nYPON, YMON, nXPON and XMON are connected with 4 internal transistor.
VDDA_ADC
nYPON
YMON
nXPON ^{Internal Transistor}
XMON
Control
XP
A[7]
XM
A[6]
YP
A[5]
YM
A[4]
Touch Panel
S3C24A0
Figure 30-2. Example of ADC and Touch Screen Interface
1. Select Separate X/Y Position Conversion Mode or Auto (Sequential) X/Y Position Conversion Mode to get X/Y
position.
2. Set Touch Screen Interface to Waiting Interrupt Mode,
3. If interrupt occurs, then appropriate conversion (Separate X/Y Position Conversion Mode or Auto (Sequential)
X/Y Position Conversion Mode) is activated.
4. After get the proper value about X/Y position, return to Waiting for Interrupt Mode.
30-3
Preliminary product information describes 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.