参数资料
| 型号： | MAX1234ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 28/44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
34
______________________________________________________________________________________
Battery Voltage, Auxiliary Input, and
Temperature Input Scan
Use this scan to make periodic measurements of both
battery inputs, both auxiliary inputs, and both tempera-
ture inputs. The respective data registers have the lat-
est results at the end of each cycle. Thus, a single write
by the host to the MAX1233/MAX1234 ADC control reg-
ister results in six different measurements being made.
Figure 20 shows this scan operation.
Touch-Initiated Screen Scans
(PENSTS = 1; ADSTS = 0)
In the touch-initiated screen-scan mode, the
MAX1233/MAX1234 automatically perform a touch-
screen scan upon detecting a screen touch. The touch-
screen scans performed are determined by the
[A/D3:A/D0] written to the ADC control register. Figure
21 shows the flowchart for a complete touch-initiated X-
and Y- coordinate scan. Selection of resolution, conver-
sion rate, averaging, and touch-screen settling time
determine the overall conversion time.
Figure 22 shows the complete flowchart for a touch-
initiated X, Y, and Z scan.
Table 38 shows ADSTS Bit Operation.
Host-Initiated Screen Scans
(PENSTS = ADSTS = 0)
In this mode, the host processor decides when a touch-
screen scan begins. The MAX1233/MAX1234 detect a
screen touch and drive
PENIRQ LOW. The host recog-
nizes the interrupt request and can choose to write to
the ADC control register to select a touch-screen scan
function (PENSTS = ADSTS = 0). Figures 23 and 24
show the process of a host-initiated screen scan.
Key-Press Initiated Debounce Scan
(KEYSTS1 = 1, KEYSTS0 =0)
In the key-press initiated debounce mode, the
MAX1233/MAX1234 automatically perform a debounce
upon detecting a key press. Key scanning begins once
a key press has been detected and ends when a key
press has been debounced (Figures 25 and 9a).
Host-Initiated Debounce Scan
In this mode, the host processor decides when a
debounce scan begins. The MAX1233/MAX1234 detect
a key press and drive KEYIRQ low. The host processor
recognizes the interrupt request and can choose to
write to the keypad control register to initiate a
debounce scan (Figures 26 and 9b).
Keypad Debouncing
Keys are debounced either when (1) a key press has
been detected, or (2) when commanded by the host MPU.
The keys scanned by the keypad row and column pins
are debounced for a period of time (debounce period)
as determined by bits [DBN2:DBN0] of the keypad con-
trol register.
The keypad controller continues scanning until the keypad
stays in the same state for an entire debounce period.
Keypad Data
Keypad data can be read out of either the keypad data
status register (maskable), or the keypad data pending
register (not maskable). The keypad mask register is
used to mask individual keys in the keypad data status
register.
GPIO Control
Write to bits [GP7:GP0] of the GPIO control register to
configure one or more of the R_/C_pins as a GPIO pin.
Write to bits [OE7:OE0] of the GPIO control register to
configure the pins as an input or an output. GPIO data
can be read from or written to the GPIO data register. A
read returns the logic state of the GPIO pin. A write sets
the logic state of a GPIO output pin. Writing to a GPIO
input pin has no effect.
GPIO Pullup Disable Register
When programmed as GPIO output, by default, the
GPIO pins are active CMOS outputs. Write a 1 to the
pullup disable register to configure the GPIO output as
an open-drain output.
Using the 8-Bit DAC for LCD/TFT
Contrast Control
Design Example:
The 8-bit DAC offers the ability to control biasing of
LCD/TFT screens. In the circuit of Figure 27, it is
desired to have the MAX1677 DC-DC converter’s VOUT
to be adjustable.
The minimum and maximum DAC voltages (VDAC(HIGH)
and VDAC(LOW)) can be found in the Electrical
Characteristics table.
The output voltage of the MAX1677 (VOUT) can be cal-
culated by noting the following equations:
VOUT = VREFDAC + i1R1
[Equation 1]
i1 = i2 + i3
[Equation 2]
i2 = VREFDAC / R2
[Equation 3]
i3 = (VREFDAC - VDAC) / R3
[Equation 4]
Substituting equations 2, 3, and 4 into equation 1
yields:
VOUT = VREFDAC + (R1 / R2) VREF + (R1 / R3)
(VREFDAC - VDAC)
[Equation 5]
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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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