
10-point Capacitive Touch Controller GT928
2
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Contents
1. Overview...................................................................................................................................................... 5
2. Features....................................................................................................................................................... 5
3. Block Diagram............................................................................................................................................. 6
4. Pin Configurations...................................................................................................................................... 7
5. Sensor Design............................................................................................................................................ 8
5.1 Layout of Rx Channels.................................................................................................................. 8
5.2 Layout of Tx Channels................................................................................................................... 8
5.3 Sensor Design Specifications....................................................................................................... 9
5.4 Touch Key Design........................................................................................................................... 9
6. I
2
C Communication.................................................................................................................................. 10
6.1 I
2
C Timing...................................................................................................................................... 10
a) Data Transmission.................................................................................................................... 12
b) Writing Data to GT928............................................................................................................. 12
c) Reading Data from GT928...................................................................................................... 13
7. HotKnot Mode........................................................................................................................................... 14
7.1 Start HotKnot................................................................................................................................ 14
7.2 Data Transmission between TPs............................................................................................... 14
7.3 Host Receives Data from GT928............................................................................................... 14
8. Description on Functions......................................................................................................................... 15
8.1 Operating Modes.......................................................................................................................... 15
a) Normal Mode............................................................................................................................. 15
b) Green Mode............................................................................................................................... 16
c) Gesture Mode........................................................................................................................... 16