SX8650 Datasheet, PDF (44/56 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
The coordinate rate in pen trigger mode is determined by the speed of the host reading the channels and the conversion
times of the channels. The host performs the minimum number of I2C commands in this mode.
Figure 40 shows the PENTRIG mode. In this example, the host waits for the NIRQ interrupt to make the acquisition of the
x,y data. After the first sample, I2C control traffic is reduced as only I2C reads are required.
Pen detected
init setup
I2C
NIRQ
read x, y
position
read x, y
position
x,y
Conversion time
x,y
Conversion time
Figure 40. Pen trigger mode
ACS Revision V2.15/October 2009
©2009 Semtech Corp.
Page 43
www.semtech.com