参数资料
| 型号： | MAX1234ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/44页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR TOUCH 28-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 电阻 |
| 触摸面板接口： | 4 线 |
| 输入数/键： | 1，4 x 4 小键盘 |
| 分辨率（位）： | 8，10，12 b |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 数据速率/采样率 (SPS，BPS)： | 50k |
| 电压基准： | 内部 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
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MAX1233/MAX1234
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
16
______________________________________________________________________________________
Output Buffer
The DAC voltage output is an internally buffered unity-
gain follower that slews at up to ±0.4V/s. The output
can swing from zero to full scale. With a 1/4FS to 3/4FS
output transition, the amplifier output typically settles to
1/2LSB in less than 5s when loaded with 10kΩ in par-
allel with 50pF. The buffer amplifier is stable with any
combination of resistive loads >10k
Ω and capacitive
loads <50pF.
Power-On Reset
All registers of the MAX1233/MAX1234 power up at a
default zero state, except the DAC data register, which
is set to 10000000, so the output is at midscale.
Keypad Controller and GPIO
The keypad controller is designed to interface a matrix-
type 4 rows
× 4 columns (16 keys or fewer) keypad to a
host controller. The KEY control register controls keypad
interrupt, keypad scan, and keypad debounce times.
The KeyMask and ColumnMask registers enable mask-
ing of a particular key or an entire column of the keypad
when they are not in use. The MAX1233/MAX1234 offer
two keypad data registers. KPData1 is the pending reg-
ister. KPData2 holds keypad scan results of only the
unmasked keys. If 12 or fewer keys are being monitored,
one or more of the row/column pins of the
MAX1233/MAX1234 can be software programmed as
GPIO pins.
Touch-Screen Detection
Touch-screen detection can be enabled or disabled by
writing to the ADC control register as shown in Table 4.
Touch-screen detection is disabled at initial power-up.
Once touch-screen detection is enabled, the Y- driver
is on and the Y- pin is connected to GND. The X+ pin is
internally pulled to AVDD through a 1MΩ resistor as
shown in Figure 6. When the screen is touched, the X+
pin is pulled to GND through the touch screen and a
touch is detected.
When the 1MΩ pullup resistor is first connected, the X+
pin can be floating near ground. To prevent false touch
detection in this case, the X+ pin is precharged high for
0.1s using the 7Ω PMOS driver before touch detection
begins.
Key-Press Detection
Key-press detection can be enabled or disabled by
writing to the keypad control register as shown in Table
17. Key-press detection is disabled at initial power-up.
Once key-press detection is enabled, the C_ pins are
internally connected to DVDD and the R_ pins are inter-
nally pulled to GND through a 16kΩ resistor. When a
key is pressed, the associated row pin is pulled to
DVDD and the key press is detected. Figure 7 shows
the key-press detection circuitry.
Interrupts
PEN Interrupt Request (
PENIRQ)
The
PENIRQ output can be used to alert the host con-
troller of a screen touch. The
PENIRQ output is normally
high and goes low after a screen touch is detected.
SW1
SW2
SW255
OUT
VREF
Figure 5. DAC Current-Steering Topology
S2
S1
1M
Ω
+AVDD
X+
Y+
X-
Y-
TOUCH-SCREEN
DETECTOR
PENIRQ
TOUCH
SCREEN
Figure 6. Touch-Screen Detection Block Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1234EVKIT | 制造商:Maxim Integrated Products 功能描述:+15KV ESD-PROTECTED TOUCH-SCREEN CO - Rail/Tube |
| MAX1236EUA | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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