SX8650 Datasheet, PDF (34/56 Pages) Semtech Corporation – World’s Lowest Power & Smallest Footprint 4-wire Resistive Touchscreen Controller with 15kV ESD

SX8650
World’s Lowest Power & Smallest Footprint 4-wire
Resistive Touchscreen Controller with 15kV ESD
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
4.6.6. Data Channel Format
Channel data is coded on 16 bits as shown in Figure 32
0 CHAN(2:0) D(11:8)
D(7:0)
RD0
RD1
Figure 32. data channel format
The 3 bits CHAN(2:0) are defined in Table 12 and show which channel data is referenced. The channel data D(11:0) is of
unsigned format and corresponds to a value between 0 and 4095.
4.6.7. Invalid Qualified Data
The SX8650 will return 0xFFFF data in case of invalid qualified data.
This occurs:
- when the SX8650 converted channels and the host channel readings do not correspond. E.g. the host converts X and Y
and the host tries to read X, Y and z1 and z2.
- when a conversion is done without a pen being detected.
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 33
www.semtech.com