- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385644 > MXB7846EUE (MAXIM INTEGRATED PRODUCTS INC) 2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor PDF資料下載
參數(shù)資料
| 型號： | MXB7846EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 4.40 MM, 0.65 MM PITCH, MO-153AC, TSSOP-16 |
| 文件頁數(shù)： | 20/23頁 |
| 文件大小： | 967K |
| 代理商： | MXB7846EUE |
M
2.375V to 5.25V, 4-Wire Touch-Screen Controller
20
______________________________________________________________________________________
2) The MXB7846’s
CS
pin is driven low by the TMS320’s
XF I/O port to enable data to be clocked into the
MXB7846’s DIN pin.
3) An 8-bit word (1XXXXXXX) should be written to the
MXB7846 to initiate a conversion and place the
device into normal operating mode. See Table 3 to
select the proper XXXXXXX bit values for your spe-
cific applications.
4) The MXB7846’s BUSY output is monitored through
the TMS320’s FSR input. A falling edge on the BUSY
output indicates that the conversion is in progress
and data is ready to be received from the device.
5) The TMS320 reads in 1 data bit on each of the next
16 rising edges of DCLK. These bits represent the
12-bit conversion result followed by 4 trailing bits.
6) Pull
CS
high to disable the MXB7846 until the next
conversion is initiated.
Layout, Grounding, and Bypassing
For best performance, use printed circuit (PC) boards
with good layouts; wire-wrap boards are not recommend-
ed. Board layout should ensure that digital and analog
signal lines are separated from each other. Do not run
analog and digital (especially clock) lines parallel to one
another, or digital lines underneath the ADC package.
Establish a single-point analog ground (star ground
point) at GND. Connect all analog grounds to the star
ground. Connect the digital system ground to the star
ground at this point only. For lowest noise operation,
ground’s power supply.
Power-supply decoupling is also crucial for optimal
device performance. A good way to decouple analog
supplies is to place a 10μF tantalum capacitor in paral-
lel with a 0.1μF capacitor bypassed to GND. To maxi-
mize performance, place these capacitors as close as
possible to the supply pin of the device. Minimize
capacitor lead length for best supply-noise rejection. If
the supply is very noisy, a 10
resistor can be connect-
ed in series as a lowpass filter.
While using the MXB7846, the interconnection between
the converter and the touch screen should be as short
as possible. Since touch screens have low resistance,
longer or loose connections may introduce error. Noise
can also be a major source of error in touch-screen
applications (e.g., applications that require a backlight
LCD panel). EMI noise coupled through the LCD panel
to the touch screen may cause flickering of the convert-
ed data. Utilizing a touch screen with a bottom-side
metal layer connected to ground decouples the noise
to ground. In addition, the filter capacitors from Y+, Y-,
X+, and X- inputs to ground also help further reduce
the noise. Caution should be observed for settling time
of the touch screen, especially operating in the single-
ended measurement mode and at high data rates.
Definitions
Integral Nonlinearity
Integral nonlinearity (INL) is the deviation of the values
on an actual transfer function from a straight line. This
straight line can be either a best-straight-line fit or a line
drawn between the endpoints of the transfer function,
once offset and gain errors have been nullified. The
static linearity parameters for the MXB7846 are mea-
sured using the end-point method.
M
CS
DIN
BUSY
HIGH IMPEDANCE
HIGH IMPEDANCE
DOUT
DCLK
START
A2
A1
A0
MODE
SER/DEF
PD1
PD0
MSB
B10
B1
B0
Figure 16. MXB7846-to-TMS320 Serial Interface Timing Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MXD1005PA__ | 5-Tap Silicon Delay Line |
| MXD1005PD__ | 5-Tap Silicon Delay Line |
| MXD1005SA__ | 5-Tap Silicon Delay Line |
| MXD1005SE__ | 5-Tap Silicon Delay Line |
| MXD1005UA__ | 5-Tap Silicon Delay Line |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MXB7846EUE+ | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EUE+T | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EUE-T | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EVC16 | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 MXB7846C16 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MXB7846EVKIT | 功能描述:開發(fā)板和工具包 - 其他處理器 Programmers, Development Systems RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。