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WM9705 датащи(PDF) 45 Page - Wolfson Microelectronics plc

номер детали WM9705
подробное описание детали  Multimedia AC97 CODEC with Integrated Touch Screen Controller
PDF  55 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9705 датащи(HTML) 45 Page - Wolfson Microelectronics plc

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WM9705
Production Data
w
PD Rev 4.0 December 2003
45
Figure 22 Control of ADC Conversions : Polled Co-ordinate Method
Note:
The pressure measurement is the difference between the voltage values measured between the resistive plates in the screen.
As two values have to be obtained before the calculation can take place, two data acquisition cycles are required as illustrated
above.
Screen Switch
/ ADC mux
mode
Different types of polled conversion with delay set to 0 (1 frame)
POLL
SYNC
ADR=1
DELAY
CONVERT
ADC MODE
X
Write to 0x76
with 0xB800
SDOUT
PENDATA
Poll = 1, Coord = 0, ADR = 001 ( 0x76 = 0x9000 ) = X Measurement
DELAY
CONVERT
ADR=2
DELAY
CONVERT
ADR=3(1)1
DELAY
CONVERT
ADR=3(2)1
X Measurement
Y Measurement
Pressure
Measurement
POLL
ADR=1
DELAY
CONVERT
ADC MODE
X
Write to 0x76
with 0x9000
PENDATA
X Measurement
Coord = 1, ADR = 011 ( 0x76 = 0xB800 ) = X, Y and Pressure
SDOUT
POLL
ADR=1
DELAY
CONVERT
ADC MODE
X
Write to 0x76
with 0xD800
SDOUT
PENDATA
DELAY
CONVERT
ADR=2
DELAY
CONVERT
ADR=5
X Measurement
AUX Measurement
Coord = 1, ADR = 101 ( 0x76 = 0xD800 ) = X, Y and AUX
Y Measurement
Screen Switch
/ ADC mux
mode
Screen Switch
/ ADC mux
mode



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