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參數(shù)資料
| 型號： | WM9712LEFL |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Audio and Touchpanel CODEC |
| 中文描述： | AC97音頻編解碼器和觸摸屏 |
| 文件頁數(shù)： | 41/78頁 |
| 文件大?。?/td> | 689K |
| 代理商： | WM9712LEFL |
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Production Data
WM9712L
w
PD Rev 4.0 December 2003
41
For an X co-ordinate measurement, the top left and bottom left corners of the touchpanel are
grounded internally to the WM9712, while the top right and bottom right contacts are connected to
TPVDD. The bottom plate becomes a potential divider with a voltage gradient in the X direction. The
voltage at the point of contact is proportional to its X co-ordinate. This voltage is measured on the
TOP pin and converted to a digital value by the ADC.
Due to the ratiometric measurement method, the supply voltage does not affect measurement
accuracy. The voltage references VREF+ and VREF- are taken from after the matrix switches, so
that any voltage drop in these switches has no effect on the ADC measurement.
V
M
= proportional to Y position
WM9712
WIPER (12)
TR (15)
ADC
V
REF+
V
REF-
VM
TPGND
TPVDD
TPGND
TPVDD
BR (14)
BL (17)
TL (16)
Figure 11 Y Co-ordinate Measurement on 5-wire Touchpanel
Y co-ordinate measurements are similar to Y co-ordinate measurements. However, the voltage
gradient on the bottom plate is in the Y direction instead of the X direction. This is achieved by
grounding the bottom left and bottom right corners of the touchpanel, and connecting the top left and
top right contacts to TPVDD.
WM9712
WIPER (12)
TR (15)
TPGND
TPGND
TPGND
TPGND
BR (14)
BL (17)
TL (16)
zero power
comparator
VDD
R
PU
PEN
DOWN
Figure 12 Pen Down Detection on 5-wire Touchpanel
Pen down detection works in a similar fashion for both 4-wire and 5-wire touchpanels (see Four-Wire
Touchpanel Operation). On a 5-wire touchpanel, all four contacts of the bottom plate are grounded,
and the top plate contact is connected to the internal programmable pull-up resistor, R
PU
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM9712LEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFV | AC97 Audio and Touchpanel CODEC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM9712LEFL/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFL/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
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