sx8675iwltrt Semtech Corporation, sx8675iwltrt Datasheet - Page 35

• Manufacturer Part Number: sx8675iwltrt
• Description: Haptics Enabled Multitouch 4/5-wire Resistive Touchscreen Controller With Proximity Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
touchscreen is used as the proximity sensor and is being touched when the conversion is performed, the
proximity measurement result may be incorrect.
If the screen is not touched, only the proximity sensing operation is performed.
In PENDET and PENTRG mode, a proximity sensing operation will be performed regularly as defined in
PROXSCANPERIOD, but only if pen is not detected.
Rev 1 – 25
PENSTAT
CONVSTAT
NIRQ
I2C Read RegIrqSrc
TOUCHRATE
Figure 46 – Pen Detect Mode (RegIrqMsk[6:2] = 00011 ; PROXSCANPERIOD = 001 ie 1/TOUCHRATE)
Figure 44 – Manual Mode – CONVERT Command (CHAN = Y ; PROXSCANPERIOD != 0; Pen down)
Idle
Pen Detection
tick
NIRQ (RegIrqMsk[6:3]=0001)
NIRQ (RegIrqMsk[6:3]=0001)
Channel Bias
Channel Conv e rsion
Channel Bias
Channel Conv e rsion
CONVSTAT
CONVSTAT
Figure 45 – Manual Mode – CONVERT Command (CHAN = Y ; PROXSCANPERIOD != 0, Pen up)
I2C
I2C
th
July 2011
Touch Conversion
Proximity Sensing
Pen Touch
CONVERT Y
CONVERT Y
PROX
PROX
Resistive Touchscreen Controller with Proximity Sensing
35
POWDLY
SX8674/SX8675/SX8676
Pen Release
Y
Y
Haptics Enabled Multitouch 4/5-Wire
READ CHANNEL
READ CHANNEL
www.semtech.com