Samsung YP-P10 User Manual Page 441

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ADC AND TOUCH SCREEN INTERFACE S3C2440A RISC MICROPROCESSOR
16-2
ADC & TOUCH SCREEN INTERFACE OPERATION
BLOCK DIAGRAM
Figure 16-1 shows the functional block diagram of A/D converter and Touch Screen Interface. Note that the A/D
converter device is a recycling type.
Pullup
Waiting for Interrupt Mode
INT_TC
INT_ADC
8:1
MUX
A/D Converter
ADC Input
Control
Interrupt
Generation
ADC
Interface
&Touch
Screen
AVDD
AGND
XP
XM
YP
YM
A[3:0]
(note)
(note)
Touch Screen
Figure 16-1. ADC and Touch Screen Interface Functional Block Diagram
NOTE: (symbol)
When Touch Screen device is used; XM or PM is only connected ground for Touch Screen I/F.
When Touch Screen device is not used, XM or PM is connecting Analog Input Signal for Normal ADC conversion.
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