參數(shù)資料
型號(hào)： MXB7846EUE+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/24頁(yè)
文件大小： 0K
描述： IC CNTRLR TOUCH RES 16TSSOP
其它有關(guān)文件： Automotive Product Guide
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 溫度傳感器
輸入類(lèi)型： 模擬
輸出類(lèi)型： 數(shù)字
接口： 4 線(xiàn)
電流 - 電源： 950µA
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 16-TSSOP
包裝： 帶卷 (TR)
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
______________________________________________________________________________________
17
Data Format
The MXB7846 output data is in straight binary format as
shown in Figure 12. This figure shows the ideal output
code for the given input voltage and does not include
the effects of offset, gain, or noise.
Applications Information
Basic Operation of the MXB7846
The 4-wire touch-screen controller works by creating a
voltage gradient across the vertical or horizontal resis-
tive network connected to the MXB7846, as shown in
the
Typical Application Circuit. The touch screen is
biased through internal MOSFET switches that connect
each resistive layer to VDD and ground on an alternate
basis. For example, to measure the Y position when a
pointing device presses on the touch screen, the Y+
and Y- drivers are turned on, connecting one side of
the vertical resistive layer to VDD and the other side to
ground. In this case, the horizontal resistive layer func-
tions as a sense line. One side of this resistive layer
gets connected to the X+ input, while the other side is
left open or floating. The point where the touch screen
is pressed brings the two resistive layers in contact and
forms a voltage-divider at that point. The data converter
senses the voltage at the point of contact through the
X+ input and digitizes it. The horizontal layer resistance
does not introduce any error in the conversion because
no DC current is drawn.
The conversion process of the analog input voltage to
digital output is controlled through the serial interface
between the A/D converter and the P. The processor
controls the MXB7846 configuration through a control
1
8
16
1
8
16
DCLK
CONTROL BYTE 0
CONTROL BYTE 1
S
CONVERSION RESULT 0
CONVERSION RESULT 1
B11 B10 B9 B8 B7 B6
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
DIN
DOUT
BUSY
. . .
CS
Figure 11. 16-Clock/Conversion Timing
1
8
15
1
8
15
1
DCLK
DIN
DOUT
BUSY
S
CONTROL BYTE 0
CONTROL BYTE 1
CONTROL BYTE 2
S
CONVERSION RESULT 0
CONVERSION RESULT 1
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
CS
Figure 10. 15-Clock/Conversion Timing
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