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參數(shù)資料
| 型號： | AK4184VG |
| 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)： | 14/36頁 |
| 文件大小： | 597K |
| 代理商： | AK4184VG |
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[AK4184]
MS0603-E-00
2007/04
14
■
Digital Interface
The AK4184 supports a SPI bus system. The Host processor starts to communicate with the serial clock. The digital
interface can be operated from 1.6V, which enables connecting with a low voltage host controller. The full scale level
of the digital I/O voltage is specified IOVDD.
IOVDD
μ
P
AK4184
TP Interface
KP Interface
GPIO port
BRCONT
SCLK
DIN
DOUT
AVDD=2.5V ~ 3.6V
XP
X-Plate (Top side)
Y-Plate (Bottom side)
YP
Touch Panel
PENIRQN
KEYIRQN
6 x 5
KEYPAD
8 GPIO
CSN
LED Driver
XN
YN
IOVDD=1.6V~AVDD
Figure7. Typical peripheral connection diagram
The AK4184 is controlled by reading from and writing to registers through the 4-wire serial interface (CSN, SCLK,
DIN, and DOUT pins). Data is composed of the control command, control data, and readout data. The transmitter
sends each bit on the falling edge of SCLK pin and the receiver latches on the rising edge of SCLK. The first 16 bits
after the falling edge of CSN pin contains the control command followed by 16 bits of control data during the write
operation, or 16 bits of readout data during the read operation before the rising edge of the CSN. This completes a
write or read operation. The max clock speed of the SCLK pin is 5MHz. The register value is reset by pulling
RESETN pin to “L”.
The control command layout is shown in Table 2. The upper 8-bit word is the touch screen control command. The
next lower 8-bits [D7:D0] are filled with “0” when accessing the touch screen block. The lower 8 bit word is
composed of other block control commands, which specify control of the Keypad, GPIO, and PWM output. When
accessing touch panel functions, the lower 8-bit word [D7:D0] is filled with “0” data. When accessing Keypad, GPIO,
or PWM control, the upper 8-bit word [D15:D8] is filled with “0” data.
This command begins with the S bit which specifies access to the touch screen block. The S bit must be set to “1”.
The touch screen command begins with the A1:A0 bits, which select the measurement axis (X, Y, and Z). The PD bit
specifies power down control of the touch screen driver and the A/D converter. When controlling other blocks, the
first bit is a W/R bit, which specifies the direction of data flow on the bus. The next bit specifies the page bit of the
register, which is the data register and the control register as shown in Table 3. The data of the next 6 bits are the
address specified in the register. The page and address of the register is shown in Table 4. The next 16 bits are data
that are read from or written to the register in Table 4. 32 SCLK cycles are necessary for both read and write
operations.
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相關代理商/技術參數(shù) |
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| AK4185 | 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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| AK4185ECB | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with SPI? Interface |
| AK4186 | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with I2C Interface |
| AK4186ECB | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with I2C Interface |
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