參數(shù)資料
型號(hào)： AK4533
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類(lèi)： Codec
英文描述： Audio Codec with Touch Screen Controller
中文描述： 音頻編解碼器與觸摸屏控制器
文件頁(yè)數(shù)： 34/40頁(yè)
文件大?。?/td> 473K
代理商： AK4533
[ASAHI KASEI]
<Revision 0.9a>
July 00
33
Power Down of Touch Screen
When the TSPD bit in Touch Screen Control register (07h) is set to "1", touch screen driver and A/D converter goes to
power-down mode. As the register value is still preserved in power-down mode, the register can be accessed under
power-down mode.
Waiting State for Pen Interrupt and INT Signal
When the PW bit in Touch Screen Control register (07h) is set to "1", the AK4533 goes to the state which waits for the
interrupt caused by touching the screen. INT pin outputs "H" through internal schmitt trigger buffer while the
screen is being touched. INT signal can notify to the external circuit that the screen is touched.
The AK4533 supplies VA to TSY_BTM with keeping TSY_TOP and TSX_TOP open state under Waiting State for
Pen Interrupt. And TSX_BTM is connected to AGND through the internal resistor, Ro.
If the screen is not touched, the current doesn't flow from Y-Plate to X-Plate because two plates are not connected, and TSX_BTM is
"L" because this terminal is connected to AGND through Ro.
When the screen is touched, the current flows from Y-Plate to X-Plate. As the resistor value of touch screen is much smaller than that
of Ro, the level of TSX_BTM is "H". This INT signal can be used as the interrupt signal to the micro controller. When the screen is
touched, INT goes "H", and returned "L" when the pen is released.
VA
INT
TSX_BTM
Ro
TPY_BTM
TPY_TOP
touched
released
TSX_TOP
INT
Processor
PW
Figure 20. Waiting for Pen Interrupt
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AK4536 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP
AK4536VN 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP
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