s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 411

• Manufacturer Part Number: s3c2410a
• Description: 16/32-bit Risc Arm Microprocessor
• Manufacturer: Samsung Semiconductor, Inc.

S3C2410A
EXAMPLE FOR TOUCH SCREEN
In this example, AIN[7] is connected with XP and AIN[5]is connected with YP pad of the touch screen panel.
To control pads of the touch screen panel (XP, XM, YP and YM), four external transistors are applied and control
signals including nYPON, YMON, nXPON and XMON are connected with four external transistors.
The following procedure is suggested:
1. Connect pads of the touch screen panel to the S3C2410A using external transistor (see Figure 16-2).
2. Select Separate X/Y Position Conversion Mode or Auto (Sequential) X/Y Position Conversion Mode to get X/Y
3. Set Touch Screen Interface to Waiting Interrupt Mode,
4. If interrupt occurs, then appropriate conversion (Separate X/Y Position Conversion Mode or Auto (Sequential) X/Y
5. After get the proper value of X/Y position, return to Waiting for Interrupt Mode.
position.
Position Conversion Mode) is activated.
1. External voltage source should be 3.3 V.
2. Internal resistance of the external transistor should be under 5 ohm.
External Voltage Source
Touch Panel
Figure 16-2. Example of ADC and Touch Screen Interface
XP
XM
YP
YM
NOTES
EINT[23]
EINT[22]
EINT[21]
EINT[20]
A[5]
A[7]
nYPON
YMON
nXPON
XMON
ADC AND TOUCH SCREEN INTERFACE
S3C2410A
Transistor
External
Control
16-3