參數(shù)資料
型號(hào)： AK4184VG
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： TSC with Keypad Scanner and GPIO Expander
中文描述： 臺(tái)糖與鍵盤掃描儀和GPIO擴(kuò)展
文件頁(yè)數(shù)： 29/36頁(yè)
文件大?。?/td> 597K
代理商： AK4184VG
[AK4184]
MS0603-E-00
2007/04
29
■
Power Down Register (PAGE 1)
The power down register determines the power down control of the keypad scanner block and touch screen block. The
power down state in the touch screen block (TPPD bit = “1”) holds all of the touch panel driver switches off, so that
current cannot flow through the touch panel. The pen interrupt function is disabled and the PENIRQN pin always
stays “H”, effective for reducing power consumption of the touch screen block.
A power down state in the keypad scanner block (KPPD bit = “1”) holds all the C1 ~ C6 pins outputs “L”. By setting
this bit = “1” stops key scanning and clears the keypad data register (KPDATA1, KPDATA2). The keypad function is
restored after the keypad scanner block is powered up. The keypad interrupt is disabled at power-down.
The power down control register format is shown here.
Addr
NAME
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
08H
PDCTRL
0
0
0
0
0
0
0
0
0
0
0
0
0
0
KPPD
TPPD
Table 37. Power Down Register Format
Description
Reserved
Enable keypad block power up/down
0 : power up(default)
1 : power down
Enable the touch screen control block power up/down
0 : power up(default)
1 : power down
Table 38. Power Down Register
Bits
15:2
1
Name
KPPD
0
TPPD
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