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參數(shù)資料
| 型號(hào)： | 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)： | 9/23頁 |
| 文件大?。?/td> | 967K |
| 代理商： | MXB7846EUE |
M
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
_______________________________________________________________________________________
9
Detailed Description
The MXB7846 uses a successive-approximation conver-
sion technique to convert analog signals to a 12-bit digi-
tal output. An SPI/QSPI/MICROWIRE-compatible serial
interface provides easy communication to a micro-
processor (μP). It features an internal 2.5V reference, an
on-chip temperature sensor, a battery monitor, and a
4-wire touch-screen interface (
Functional Diagram
).
Analog Inputs
Figure 2 shows a block diagram of the analog input sec-
tion that includes the input multiplexer of the MXB7846,
the differential signal inputs of the ADC, and the differ-
ential reference inputs of the ADC. The input multiplexer
switches between X+, X-, Y+, Y-, AUX, BAT, and the
internal temperature sensor.
In single-ended mode, conversions are performed using
REF as the reference. In differential mode, ratiometric
conversions are performed with REF+ connected to X+ or
Y+, and REF- connected to X- or Y-. Configure the refer-
ence and switching matrix according to Tables 1 and 2.
During the acquisition interval, the selected channel
charges the sampling capacitance. The acquisition
interval starts on the fifth falling clock edge and ends
on the eighth falling clock edge.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens, and more time must be
allowed between conversions. The acquisition time
(t
ACQ
) is the maximum time the device takes to acquire
the input signal to 12-bit accuracy. Calculate t
ACQ
with
the following equation:
where R
IN
= 2k
and R
S
is the source impedance of
the input signal.
Source impedances below 1k
do not significantly affect
the ADC’s performance. Accommodate higher source
impedances by either slowing down DCLK or by placing
a 1μF capacitor between the analog input and GND.
t
R
(
R
pF
ACQ
S
IN
.
8 4
+
)
×
=
25
MICROWIRE is a trademark of National Semiconductor Corp.
+V
DD
PENIRQ
TEMP1
V
REF
A2–A0
(SHOWN 001
B
)
SER/DFR
(SHOWN HIGH)
GND
X+
X-
Y+
Y-
12-BIT ADC
-IN
AUX
V
BAT
REF+
REF-
REF ON/OFF
7.5k
2.5k
2.5V
REFERENCE
BATTERY
ON
+IN
TEMP0
MXB7846
Figure 2. Equivalent Input Circuit
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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(píng)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(píng)估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
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