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参数资料
| 型号： | MAX1234EGI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | 【15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC28 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, QFN-28 |
| 文件页数： | 18/44页 |
| 文件大小： | 706K |
| 代理商： | MAX1234EGI |
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M
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
18
______________________________________________________________________________________
high and goes low after a screen touch is detected.
PENIRQ
returns high only after a touch-screen scan is
completed.
PENIRQ
does not go low again until one of
the touch-screen data registers is read.
Figures 8a
and
8b show the timing diagrams for the
PENIRQ
pin.
Keypad Interrupt Request (
KEYIRQ
)
The
KEYIRQ
output can be used to alert the host con-
troller of a key press. The
KEYIRQ
output is normally
high and goes low after a key press is detected.
KEYIRQ
returns high only after a key-press scan is
completed.
KEYIRQ
does not go low again until one of
the key-press data registers is read.
Figures 9a and 9b
show the timing diagrams for the
KEYIRQ
pin.
Busy Indicator (
BUSY
)
BUSY
informs the host processor that a scan is in
progress.
BUSY
is normally high and goes low and
stays low during each functional operation. The host
controller should wait until
BUSY
is high again before
using the serial interface.
Digital Interface
The MAX1233/MAX1234 interface to the host controller
through a standard 3-wire serial interface at up to
10MHz. DIN and
CS
are the digital inputs to the
MAX1233/MAX1234. DOUT is the serial data output.
Data is clocked out at the SCLK falling edge and is high
impedance when
CS
is high.
PENIRQ
and
KEYIRQ
com-
municate interrupts from the touch-screen and keypad
controllers to the host processor when a screen touch or
a key press is detected.
BUSY
informs the host proces-
sor that a scan is in progress. In addition to these digital
I/Os, the row and column pins of the keypad controller
can be programmed as GPIO pins.
Communications Protocol
The MAX1233/MAX1234 are controlled by reading from
and writing to registers through the 3-wire serial inter-
face. These registers are addressed through a 16-bit
command that is sent prior to the data. The command
is shown in
Table 2
.
The first 16 bits after the falling edge of
CS
contain the
command word. The command word begins with an
R/
W
bit, which specifies the direction of data flow on
the serial bus. Bits 14 through 7 are reserved for future
use. Bit 6 specifies the page of memory in which the
desired register is located. The last 6 bits specify the
address of the desired register. The next 16 bits of data
are read from or written to the address specified in the
command word. After 32 clock cycles, the interface
automatically increments its address pointer and con-
tinues reading or writing until the rising edge of
CS
, or
until it reaches the end of the page.
DATA
READ
DOUT
TOUCH-
SCREEN
DATA
R_
KEYIRQ
BUSY
CS
Figure 9a. Timing Diagram for Key-Press-Initiated Debounce
Scan
R_
DOUT
DATA
READ
TOUCH-
SCREEN
DATA
DIN
KEYIRQ
BUSY
CS
Figure 9b. Timing Diagram for Host-Initiated Keypad
Debounce Scan
BIT15
MSB
BIT14
BIT13
BIT12
BIT11
BIT10
BIT9
BIT8
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
LSB
R/W
RES
RES
RES
RES
RES
RES
RES
RES
PAGE
ADD5
ADD4
ADD3
ADD2
ADD1
ADD0
Table 2. Command Word Format
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1234EGI+ | 制造商:Maxim Integrated Products 功能描述:TOUCH SCREEN CONTROLLER 28-PIN QFN EP - Rail/Tube |
| MAX1234EGI-T | 功能描述:触摸屏转换器和控制器 RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1234ETI+ | 功能描述:触摸屏转换器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1234ETI+T | 功能描述:触摸屏转换器和控制器 4Ch uWire QSPI/SPI Touch Interface RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX1234EVC16 | 功能描述:数据转换 IC 开发工具 MAX1233/34 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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