KT6738 is an enhanced analog front end circuit for multi-touch capacitive panel with a maximum resolution of 64 senses (CS) by 40 HV drives (CD) that is fully programmable. High sensitivity of sensing channels allow to sense small diamond size down to
Data acquisition (DAQ) consists into a charge sense amplifier (CSA) followed a 12-bit AD converter (ADC). CD driver is includes several line excitation sequences that can be programmed to improve noise rejection. The minimum conversion period is 16μs.
Data output are provided through SPI interface with 4-bit bus width. KT6738 includes also a power management that consists into a 1.8V regulator for the logic part.
KT6738 is intended to be used in large size application in the package of LQFP 128 with the KT6738 as a controller followed by 4 x KT6738 in order to support up to 256 by 160 resolution.
Sensing & Driving
Sense channel: (CS)
ADC 12 bits resolution
Minimum line time of 16μs
Capacitor driver (CD)
Package type: LQFP128