th July 2011 44 www.semtech.com SX8657/SX8658 Haptics " />
參數(shù)資料
型號: SX8658IWLTRT
廠商: Semtech
文件頁數(shù): 39/61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
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
44
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Command
Command(7:0)
Function
SELECT
1
0
1
0
X
Chan(2:0)
Select and bias channel.
CONVERT
1
0
1
X
Chan(2:0)
Convert channel.
MAN
1
0
X
Enter manual mode.
PENDET
1
0
1
X
Enter pen detect mode.
PENTRG
1
0
X
Enter pen trigger mode.
Table 9 : Command Codes
Channel
Chan(2:0)
Description
X
0
X channel
Y
0
1
Y channel
Z1
0
1
0
First channel for pressure measurement
Z2
0
1
Second channel for pressure measurement
SEQ
1
Channels enabled in RegChanMsk register
Table 10 : Channel Codes
11.6
Read Channel (Touchscreen Interface)
The I2C read channel sequence is given in figure below. After the start condition [S], the chip slave address
(SA) is sent, followed by an eighth bit (R=‘1’) indicating a read. The chip responds with an acknowledge [A] and
the first data byte (RD0). The host sends an acknowledge [A] and the chip responds with the second data byte
(RD1). If the host needs to read more channels, it will acknowledge [A] and the chip will send the next data
bytes. This sequence will be repeated until the host terminates with a NACK [N] followed immediately by a stop
[P].
The channel data that can be read is defined by RegChanMsk, or the last convert command in manual mode. A
maximum number of 8 data bytes can be read when all channels (X, Y, Z1, Z2) are activated in RegChanMsk.
The STOP [P] (if following the last valid data) releases high the NIRQ line. All ADC related operations (touch
conversion, proximity conversion, pen detection) are stopped as long as all valid channel data have not been
read (ie as long as NIRQ is low).
Figure 53 – I2C Read Channel
The sampling of the screen by the chip and the host I2C bus traffic are events that might occur simultaneously.
The chip will synchronize these events by the use of clock stretching if that is required. The stretching occurs
directly after the address and read bit have been sent for the I2C read channels command (see figure above).
The channel data is sent with the following order: X, Y, Z1, Z2. It is coded as described in figure below
Typical applications require only X and Y coordinates, thus only 4 bytes of data will be read in this case.
CHAN(2:0)
RD0
D(11:8)
D(7:0)
RD1
0
Figure 54 – Channel Data Format
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