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參數(shù)資料
| 型號(hào)： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 26/61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(dòng)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(píng)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
32
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
5.4
Host Operation
5.4.1
General Description
If PROXIRQSEL = 0, an interrupt can be triggered when the user is detected to be close, detected to be far, or
both (PROXCLOSEIRQEN, PROXFARIRQEN).
Figure 39 – Proximity Sensing Host Operation (Pen Trigger Mode ; RegIrqMsk[6:4] = 110 ; PROXIRQSEL = 0)
If PROXIRQSEL = 1, instead of the proximity “Far” state, an interrupt can be triggered at the end of each
proximity sensing
operation
indicating
to
the
host
when
the
proximity sensing
block
is
running
(PROXCONVDONEIRQEN). This may be used by the host to synchronize noisy system operations or to read
PROXRAW, PROXUSEFUL, PROXAVG, PROXDIFF synchronously for monitoring purposes.
Figure 40 – Proximity Sensing Host Operation (Pen Trigger Mode ; RegIrqMsk[6:4] = 010 ; PROXIRQSEL = 1)
In both cases above, an interrupt can also be triggered at the end of compensation (PROXCOMPDONEEN).
5.4.2
Proximity Sensing vs Touch Operations
As previously mentioned, touch and proximity operations share the same ADC and hence the chip implements
time multiplexing between these two types of operations. Also, proximity sensing doesn’t need to be performed
while pen is down (not needed as host knows already something touches the screen).
In all operating modes, if PROXSCANPERIOD = 0, no proximity operation is performed (i.e. §4.6). The following
hence assumes PROXSCANPERIOD != 0. For simplicity we also assume that NIRQ is only used for reporting
touch operations i.e. RegIrqMsk[6:4] = 000 (PROXSTAT mapped to AUX pin, or polled via I2C).
In MAN mode, a CONVERT command (if not preceded by a SELECT command) will perform a proximity
sensing operation before the touchscreen operation, whatever the pen status. Hence please note that if the
Pen Detection
NIRQ
I2C Read RegIrqSrc
Proximity Sensing (Analog + Digital)
PROXSTAT
CONVSTAT
PROXSCANPERIOD
tick
User in range
User out of range
Pen Detection
NIRQ
I2C Read RegIrqSrc
Proximity Sensing (Analog + Digital)
PROXSTAT
CONVSTAT
PROXSCANPERIOD
tick
User in range
User out of range
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