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參數(shù)資料
| 型號： | AK4184 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | TSC with Keypad Scanner and GPIO Expander |
| 中文描述： | 臺糖與鍵盤掃描儀和GPIO擴展 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 597K |
| 代理商： | AK4184 |
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[AK4184]
MS0603-E-00
2007/04
19
■
Pen Interrupt
The AK4184 has a pen interrupt function to detect a pen touch. The pen interrupt function is enabled during power-
down state. The YN pin is connected to GND during the pen interrupt enabled state. The XP pin is pulled up via an
internal resistor (Ri), typically 50k
Ω
. If the touch plate is pressed by pen, the current flows via <AVDD> – <Ri> –
<XP> –<the plates> - <YN>- <GND>. The resistance of the plate is generally several hundreds, and PENIRQN is
forced to a “L” level. If the pen is released, PENIRQN returns to a “H” level because two plates are disconnected,
and the current doesn’t flow between the two plates. PENIRQN pin is a buffer type. The “H” level is specified by
IOVDD.
The operation of PENIRQN is related to PD bit. The pen interrupt function is disabled and stays “H” irrespective of
the pen touch when the PD bit is “1”. When the PD bit is “0”, the PENIRQN pin is forced “H” from the falling edge
of the sixth SCLK to the rising edge of CSN. The pen interrupt function is valid when the CSN pin is “H”. The
PENIRQN pin stays low when the touch panel is pressed, and stays high when the touch panel is not pressed.
The pen interrupt function is determined by the present PD bit setting when the host writes to or reads from the
register other than the pen touch block.
The touch panel block is able to power down when the TPPD bit is “1” (Table 25). All the touch panel drivers turn off
in this state and the pen interrupt function is not valid. The current through the touch screen does not flow even
through the panel is pressed.
XP
PENIRQN
Driver ON
YN
EN
Ri =
50k
Ω
Driver OFF
IOVDD
AVDD
AVDD
Figure 9. PENIRQ Functional Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4184VG | TSC with Keypad Scanner and GPIO Expander |
| AK4220 | 7:3 Audio Switch and 6:3 Video Switch |
| AK4220VQ | 7:3 Audio Switch and 6:3 Video Switch |
| AK4250 | Output Coupling Capacitor-less Video Amp with LPF |
| AK4250VU | Output Coupling Capacitor-less Video Amp with LPF |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4184A | 制造商:AKM 制造商全稱:AKM 功能描述:TSC with Keypad Scanner and GPIO Expander |
| AK4184AEG | 制造商:AKM 制造商全稱:AKM 功能描述:TSC with Keypad Scanner and GPIO Expander |
| AK4184VG | 制造商:AKM 制造商全稱:AKM 功能描述:TSC with Keypad Scanner and GPIO Expander |
| AK4185 | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with SPI? Interface |
| AK4185_10 | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with SPI? Interface |
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