KASA's KT System (128 or 256 SENSING CH RDK) consists of two or four analog sense interface IC KT6737 , one or two drive IC KT3005 and its Processing unit KT9006 . The system allows cascaded configuration, thus supporting various touch screen applications depending on the customer requirements. A typical application with two or four analog sense devices and one or two drive IC can support up to 208 or 416 channels (X+Y = 128+80 or 256+160=416).
The KT6737 is a high-precision capacitive analog sense interface IC featuring up to 64 sensing channels and the KT3005 is a high-voltage line driver featuring up to 80 driving channels with a high flexibility of the channel’s configuration. The 128 SENSING CH RDK allows high-speed scan rates up to 200Hz with multiple fingers capabilities (10+). This unique feature enables the magnificent feeling of real time processing of multiple users fingers and fast interactivity with large size touch displays.
Through a proprietary high-speed communication protocol, the data are transmitted to the KT9006 controller over a four wires serial data bus and stored into the frame buffer memory. The data processing, touch detection and tracking are handled by the embedded KT Processing unit. The cascaded function is directly managed by the controller through the communication interface.
Controller Touch Features
10+ touch detection & tracking (X,Y,Z)
Passive and Active Stylus
Touch Down Latency: 20ms
Touch Panning Latency: 15ms
Max Position refresh time: < 5ms
10240 max nodes (128x80) in 16:10 format
Controller Interface with slaves
SPI Data Interface D[3:0]: fmax = 16 MHz
Serial Clock (SCK)
Chip Select (CS) for Cascade Function
MOSI interface from Controller
Controller Interface with Host
USB2.0 HID interface – high speed
Power Consumption @5V
Active mode < 190mA (10 touches, 200Hz, 208Ch)
Suspend mode < 2.5mA
Wake-on touch < TBD mA (5Hz refresh)