sx8639 Semtech Corporation, sx8639 Datasheet - Page 67
sx8639
Manufacturer Part Number
sx8639
Description
Low Power, Capacitive Button And Wheel Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity Sensing
Manufacturer
Semtech Corporation
Datasheet
1.SX8639.pdf
(81 pages)
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ADVANCED COMMUNICATIONS & SENSING
Revision 7_8, September 10
Address
Address
Address
0x03
0x04
0x07
0x01
0x02
Name
WhlPosMsb 7:0
WhlPosLsb
Name
CapStatMsb
CapStatLsb
Name
GpiStat
Bits
7:0
Bits
7:0
Bits
7
6
5
4
3:0
7
6
5
4
3
2
1
0
Table 26 Wheel,
Description
GPI[7:0]
Status
Description
Wheel Position[15:8]
Wheel Position[7:0]
Table 27
Description
Reserved
Wheel Rotation
Clockwise
Wheel Rotation
Counter Clockwise
Wheel Touched
Reserved
Button 7 Touched
Button 6 Touched
Button 5 Touched
Button 4 Touched
Button 3 Touched
Button 2 Touched
Button 1 Touched
Button 0 Touched
(8 sensors) with Enhanced LED Drivers and Proximity Sensing
© 2010 Semtech Corp.
Table 28
Low Power, Capacitive Button and Wheel Touch Controller
Status of each individual GPI pin
0: Low
1: High
Bits of non-GPI pins are set to 0.
Wheel position MSB/LSB
Button status MSB/LSB
I2C GPI status
67
Wheel Rotation status
0: No rotation (default)
1: Rotation
The status remains high as long as the wheel is
touched and no opposite rotation has occurred.
Wheel Touch status
0: Released (default)
1: Touched
Button Touch status
0: Released (default)
1: Touched
Shows the current (touched) or last (released)
wheel position[15:0] unsigned (default 0x00)
DATASHEET
www.semtech.com
SX8639
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