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參數(shù)資料
| 型號： | SX8652IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 4/29頁 |
| 文件大小： | 0K |
| 描述： | IC TOUCH SCREEN CTRLR 14DFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 電阻 |
| 觸摸面板接口： | 4 線，5 線 |
| 輸入數(shù)/鍵： | 2 鍵 |
| 分辨率（位）： | 12 b |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 數(shù)據(jù)速率/采樣率 (SPS，BPS)： | 74k |
| 電壓基準(zhǔn)： | 內(nèi)部 |
| 電源電壓： | 1.65 V ~ 3.7 V |
| 電流 - 電源： | 10mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 14-DFN |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | SX8652IWLDKR |
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Revision V1.7/October 2010
2010 Semtech Corp.
SX8652
www.semtech.com
Page 12
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
4. 4-wire Touch Screen Detailed Description
4.1. Touch Screen Operation
A 4-wire resistive touch screen consists of two resistive sheets separated by an insulator (Figure 4.2).
Figure 8. 4-wire Touch Screen
When a pressure is applied on the top sheet with a stylus for example, a connection with the lower sheet is made.
The contact point split the Rxtot bottom resistance in the vertical axis into two resistances
R1 and R2. In the same way, the Rytot resistance in the horizontal axis of the top sheet is
divided into two resistances R3 and R4.
The touchscreen controller imposes a voltage level on X or Y electrodes allowing the
detection of the contact position.
4.2. Coordinates Measurement
During the touch, the top and bottom touchscreen layers
are connected. The resistance between the two sheets
is RT. A current coming from the reference voltage goes
from
X+
to
X-
to
perform
the
X
coordinate
measurement. Figure 9 shows the measurement
schematics.
Since the ADC had a high input impedance, no current
flows through RT and R3. The positive ADC input is
biased with a voltage created by the R1, R2 voltage
divider.
The conversion with the 12 bit ADC gives the X location.
Figure 9. Abscissa (X) coordinates measurement
The Y coordinate is measured in a similar fashion with the measurement setup given in Table 7.
X-
Y+
Y-
X+
Top
cond
uctiv
e sh
eet
B
ott
om
co
nd
uc
tiv
e
sh
ee
t
Y
ele
ctr
od
es
X ele
ctrod
es
Y-
Y+
Rytot
Top conductive sheet before
the stylus contact
Y-
Y+
R4
R3
Top conductive sheet after
the stylus contact
Contact point
with the top
conductive
sheet
Rxtot
R1
R2
+
=
Rytot
R3
R4
+
=
X-
X+
R2
R1
+
-
RT
Y-
Y+
R4
R3
Xpos
+
-
ADC
Vref
Xpos
4095
R2
R1
R2
+
--------------------
=
Ypos
4095
R4
R3
R4
+
--------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SX8653 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
| SX8653ICSTRT | 制造商:Semtech Corporation 功能描述: |
| SX8653ICSTRT1 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
| SX8653IWLTRT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:TAPE & REEL 4/5 WIRE RESISTIVE TOUCH |
| SX8653IWLTRT1 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
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