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參數(shù)資料
| 型號： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 11/61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
19
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
In case the range of POWDLY settings available is not enough to cover the required settling time, one can use
the SELECT command first to bias the channel, and then send the CONVERT command hence extending bias
time. SELECT command cannot be used with CHAN=SEQ.
Figure 19 – Manual Mode – SELECT command (CHAN = Y; PROXSCANPERIOD = 0)
At the end of the conversion(s) bit CONVSTAT will be reset which will trigger NIRQ falling edge (if enabled in
RegIrqMsk). Host can then read channel data which will release NIRQ.
Please note that when the SELECT command is used, the channel is converted whatever the pen status (no pen
detection performed).
4.6.3
Pen Detect Mode (PENDET)
In pen detect mode (PENDET) the chip will only run pen detection (continuously when pen is up, regularly as
defined by TOUCHRATE when pen is down) and update PENSTAT bit in RegStat to be able to generate an
interrupt (NIRQ) upon pen detection and/or release. No (touch) conversion is performed in this mode.
To enter PENDET mode the host must set TOUCHRATE > 0 and then send PENDET command.
To quit PENDET mode and stop the touchscreen interface the host must enter MAN mode.
Figure 20 – Pen Detect Mode (RegIrqMsk[3:2] = 11 ; PROXSCANPERIOD = 0)
Please note that the next pen detection is not performed as long as NIRQ is low. If the host is too slow and
doesn’t read IrqSrc before next TOUCHRATE tick, no operation is performed and this TOUCHRATE tick is
simply ignored until next one.
4.6.4
Pen Trigger Mode (PENTRG)
In pen trigger mode (PENTRG) the chip will perform pen detection (continuously when pen is up, regularly as
defined by TOUCHRATE when pen is down) and if pen is down, will be followed by a conversion as defined in
RegChanMsk. The chip will update CONVSTAT bit in RegStat and will be able to generate an interrupt (NIRQ)
upon conversion completion. The chip will also update PENSTAT bit in RegStat and will be able to generate an
interrupt (NIRQ) upon pen detection and/or release.
The PENTRG mode offers the best compromise between power consumption and coordinate throughput. To
enter PENTRG mode the host must set TOUCHRATE > 0 and then send PENTRG command. To quit PENTRG
mode and stop the touchscreen interface the host must enter MAN mode.
Idle
Pen Detection
NIRQ
I2C Read RegIrqSrc
Pen Touch
Pen Release
PENSTAT
CONVSTAT
SELECT(Y)
I2C
Channel Bias
CONVERT(Y)
Channel Conversion
READ CHANNEL
Y
POWDLY
NIRQ (RegIrqMsk[3]=1)
Actual bias time
CONVSTAT
TOUCHRATE
tick
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