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WM8948ECS/R 데이터시트(PDF) 96 Page - Wolfson Microelectronics plc

부품명 WM8948ECS/R
상세설명  Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller
PDF  189 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8948ECS/R 데이터시트(HTML) 96 Page - Wolfson Microelectronics plc

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WM8948
Production Data
w
PD, May 2011, Rev 4.1
96
WM8948
YP
XP
YN
XN
GND
LDOVDD
AUX
ADC
X position
Figure 35 X-axis Touch Panel Measurement
Y-axis measurement is performed by applying a potential difference between the Top and Bottom
sides of the touch panel. When contact is made between the two sheets, the voltage present on the
Left or Right connections is a measure of the Y-axis position of the contact. The configuration is
illustrated in Figure 36.
WM8948
YP
XP
YN
XN
GND
LDOVDD
AUX
ADC
Y position
Figure 36 Y-axis Touch Panel Measurement
‘Pen Down’ detection uses a zero-power comparator with an internal, programmable pull-up resistor.
When the touch panel is not being touched, no current flows between the touch panel sheets, and
the comparator output is low. When the touch panel is touched, current flows through the panel and
through the pull-up resistor, and the comparator output goes high. The sensitivity of the circuit can be
adjusted using different values of pull-up resistor; a large pull-up resistance leads to the most
sensitive response. The configuration is illustrated in Figure 37.
WM8948
YP
XP
YN
XN
GND
LDOVDD
RPU
zero power
comparator
PEN_DOWN
Figure 37 Pen-Down Touch Panel Detection



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