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參數(shù)資料
| 型號： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 10/61頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TOUCH SCREEN 12BIT 20QFN |
| 標準包裝： | 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： | 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： | 標準包裝 |
| 其它名稱： | SX8658IWLDKR |
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ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
18
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
4.6
Host Operation
4.6.1
Overview
The chip has three operating modes that are configured using the I2C as defined in §11 :
Manual (command ‘MAN’ and TOUCHRATE = 0).
Pen detect (command ‘PENDET’ and TOUCHRATE > 0).
Pen trigger (command ‘PENTRG’ and TOUCHRATE > 0).
At power-up the chip is set in manual mode.
4.6.2
Manual Mode (MAN)
In manual mode (MAN) the touchscreen interface is stopped and conversions must be manually triggered by the
host using SELECT and CONVERT command.
When a command is received, the chip executes the associated tasks listed in table below and waits for the next
command. It is up to the host to sequence all actions.
Pen detection is performed after each CONVERT command and if pen is not detected, no touch operation is
performed. Following figures assume pen down. PENSTAT is not updated in MAN mode.
To enter MAN mode the host must send the MAN command and then set TOUCHRATE = 0.
Command
Actions
CONVERT(CHAN)
Select and bias CHAN
Wait for the programmed settling time (POWDLY)
Convert CHAN
SELECT(CHAN)
Select and bias CHAN
Table 6 – Manual Mode Commands
As illustrated in figure below the CONVERT command will bias the channel, wait for the programmed settling
time (POWDLY), and run the conversion.
Figure 17 – Manual Mode – CONVERT Command (CHAN = Y; PROXSCANPERIOD = 0)
When the CONVERT command is used with CHAN=SEQ, multiple channels as defined in RegChnMsk are
sampled. In this case, each channel will be sequentially biased during POWDLY before a conversion is started.
At the end of each channel conversion the bias is automatically removed.
Figure 18 – Manual Mode – CONVERT Command (CHAN = SEQ = [X;Y]; PROXSCANPERIOD = 0)
I2C
Channel Bias
CONVERT(SEQ)
Channel Conversion
READ CHANNEL
POWDLY
Y
X
NIRQ (RegIrqMsk[3]=1)
CONVSTAT
I2C
Channel Bias
CONVERT(Y)
Channel Conversion
READ CHANNEL
NIRQ (RegIrqMsk[3]=1)
POWDLY
Y
CONVSTAT
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