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參數(shù)資料
| 型號： | SX8652IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 18/29頁 |
| 文件大小： | 0K |
| 描述： | IC TOUCH SCREEN CTRLR 14DFN |
| 標準包裝： | 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： | 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： | 標準包裝 |
| 其它名稱： | SX8652IWLDKR |
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Revision V1.7/October 2010
2010 Semtech Corp.
SX8652
www.semtech.com
Page 25
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
capacitance of the touchscreen. We can define tau as the RC time constant. POWDLY duration should be programmed to
10 tau to reach 12 bit accuracy.
Adding a capacitor from the touch screen drivers to ground is a solution to minimize external noise but it increases settling
time and consequently the power consumption.
10.3.2. SETDLY
A best method to filter noise is described in section [6] (Data processing). When filtering is enabled, the channel will be
biased initially during a time of POWDLY for the first conversion. The parameter SETDLY sets the settling time between the
subsequent conversions in a filter set. In most applications, SETDLY can be set to 0. In applications with a high tau and
where accuracy of 1LSB is required SETDLY should be increased.
10.4. AUX Input - 4-wire touchscreen only
The AUX input can be used to sample an analog signal in the range 0-VDD. For system supply by battery, the battery
voltage can be monitored for example. The conversion is done in sequence with the touchscreen acquisition therefore the
sample rate is defined with RegCtrl0 in AUTO mode.
The AUX pin can also triggered conversions. A rising edge, a falling edge or both applied on the AUX pin can trigger the
conversion. This is defined by AUXACQ in RegCtrl1.
This method can be used to sample touchscreen when there is noise-free periods.
10.5. Interrupt Generation
An interrupt (NIRQ=0) will be generated:
During the power-up phase or after a reset
After completion of a conversion in MANUAL, PENTRIG or AUTO mode. CONVIRQ (bit [7] of RegStat) will be set at the
same time.
After a touch on the panel being detected in PENDET mode. PENIRQ (bit [6] of RegStat) will be set at the same time.
The NIRQ will be released and pulled high(NIRQ=1) by the external pull-up resistor:
When the power-up phase is finished
When the host read all channels data that were previously converted by the SX8652 in MANUAL, PENTRIG or AUTO
mode. CONVIRQ will be cleared at the same time.
When the host read the status register in PENDET mode. PENIRQ, will be cleared at the same time.
An active NIRQ (low) needs to be cleared before any new conversions will occur.
10.6. Coordinate Throughput Rate
The coordinate throughput rate depends on the following factors:
The SPI communication time: Tcom
The conversion time: Tconv
The coordinate rate is the frequency to get the X, Y, Z1 and Z2 coordinate:
10.6.1. SPI Communication Time
The minimum time to read the channel data in PENTRIG mode is:
The highest throughput will be obtained with a SPI frequency of 5MHz when the host read the channel data as quickly as
possible after the NIRQ falling edge.
CoordRate
1
T
c om
T
c onv
+
-------------------------------
=
T
com
8
16
N
chan
×
+
(
) T
SPI
×
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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