The eKT8150 is a low-cost single chip solution for capacitive touch pad. It is an 8-bit RISC microcontroller with Serial Peripheral Interface (SPI-Master/Slave), Universal Asynchronous Receiver / Transmitter (UART 9600), and I2C-Slave (Normal/Fast Mode).
In function application, the eKT8150 supports slider information (absolute position) and key information (On/Off) for customers.
The capacitive touch pad sensor is covered with a plastic case. It can also auto calibrate the parameters for a wide range of capacitance on the touch pad sensor (5pF~25pF). The system controller converts finger position data to either scrolling data or button presses, depending on finger location and human interface context.

Features

• Operating voltage: 2.6V ~ 5.5V, Ripple < 100mVpp
• Power-on reset time: Stable time for operating < 150ms, the touch pad will send
  "Packet Hello" after initialization
• Interface features: Serial Peripheral Interface (SPI-Master/Slave) / Universal
  Asynchronous Receiver Transmitter (UART) / I2C-Slave.
• Operating mode:

  Mode	Description	Current
  Normal	Finger on touch pad Higher scan rate	<1.5 mA
  Idle	Finger leaves touch pad Lower scan rate Scan rate in idle mode can be adjusted by changing the external RC value.	<200 µA
  Sleep	No scan	<20 µA

• Application mode:
  - 1 Slider (0 ~ 79) + 6 Keys (ON/OFF). Default setting.
  - 1 Long Slider (0 ~ 207).
• Useful Information
  Slider information and Buttons information can be acquired through protocol
  decode.
• Sensitivity: Sensitivity can be adjusted from 0 to 10 for different thickness of the
  plastic cover. The default label is "4".
• Package type: QFN40