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參數(shù)資料
| 型號： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 17/61頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TOUCH SCREEN 12BIT 20QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 電阻式，觸感驅(qū)動器 |
| 觸摸面板接口： | 4，5 線 |
| 輸入數(shù)/鍵： | 1 TSC，雨刷，鑰匙 |
| 分辨率（位）： | 12 b |
| 評估套件： | * |
| 數(shù)據(jù)接口： | I²C，串行 |
| 電壓基準(zhǔn)： | 內(nèi)部 |
| 電源電壓： | 2.3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 20-QFN（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | SX8658IWLDKR |
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ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
24
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
The challenge of capacitive sensing is to detect this relatively small variation of CSensor (CUser usually contributes
for a few percents only) and differentiate it from environmental noise (CEnv also slowly varies together with the
environment characteristics like temperature, etc). For this purpose, the chip integrates an auto offset
compensation mechanism which dynamically monitors and removes the CEnv component to extract and process
CUser only. See §5.2.5 for more details.
In first order, CUser can be estimated by the formula below:
A is the common area between the two electrodes hence the common area between the user’s finger/palm/face
and the sensor.
d is the distance between the two electrodes hence the proximity distance between the user and the system.
0
ε
is the free space permittivity and is equal to 8.85 10e-12 F/m (constant)
r
ε
is the dielectric relative permittivity.
When performing proximity sensing the dielectric relative permittivity is roughly equal to that of the air as the
overlay is relatively thin compared to the detection distance targeted. Typical permittivity of some common
materials is given in the table below.
Material
Typical
r
ε
Glass
8
FR4
5
Acrylic Glass
3
Wood
2
Air
1
From the discussions above we can conclude that the most robust and efficient design will be the one that
minimizes CEnv value and variations while improving CUser.
5.2.2
AFE Block Diagram
Figure 28 – Analog Front-End Block Diagram
d
A
ε
C
r
User
0
=
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