A good PCB layout for the TSC2046EIPWR involves separating the analog and digital grounds, using a solid ground plane, and placing the device close to the touch sensors. Additionally, using a 4-layer PCB with a dedicated ground plane and a power plane can help reduce noise and improve performance.
Calibration involves adjusting the sensor gain and offset to compensate for variations in the touch sensor and PCB. This can be done using the device's built-in calibration registers or through external calibration using a microcontroller. Refer to the datasheet and application notes for specific calibration procedures.
The maximum operating frequency of the TSC2046EIPWR is 400 kHz. Operating at higher frequencies can increase power consumption, but it also improves touch sensor responsiveness. A balance between frequency and power consumption must be struck depending on the specific application requirements.
To minimize EMI and RFI, use a shielded cable for the touch sensor interface, keep the device and sensors away from high-frequency sources, and use a common-mode choke or ferrite bead to filter out noise. Additionally, ensure that the PCB layout and component placement are optimized for EMI reduction.
The recommended power-up sequence for the TSC2046EIPWR is to first apply the analog power supply (VCC), followed by the digital power supply (VDD), and finally the clock signal. This sequence helps prevent damage or malfunction due to incorrect power-up conditions.
TSC2046EIPWR datasheet
by Texas Instruments
