Capacitive Tactile

EM is offering a competitive, accurate and ultra-low power capacitive Touch solution based on the EM6420.

The EM6420 is a true ultra-low power Touch Sensor Interface IC able to scan sequentially up to 16 tightly spaced as well as regularly spaced sensor electrodes, with <µ5A (1.5V) active current at 8Hz scan frequency. The device parameters (number of used sensors and scan frequency, sensitivity level, IRQ condition) are configurable either from a host microcontroller through a communication port or through configuration inputs.

Recognised touch inputs will be signaled with an active edge at the IRQ pad and data are ready to be read through the communication port by the host MCU. Conditions for the IRQ to get active are configurable : at the end of every scan, at the end of a scan if at least one sensor is active or at the end of a scan if the sensors state has changed.

The EM6420 can also detect the most active sensor in applications where sensors are tightly spaced. It compares relative levels among sensors and selects the sensor with the largest signal strength.

To increase the number of sensors above 16 capacitive sensors, use several EM6420 in parallel.

EM6420 supply voltage range is selectable by pin configuration from 1.2 V to 2.0 V or from 2.2 V to 3.6 V.

Interfaces

  • Up to 16 analogue sensor inputs
  • User selectable communication interfaces : 4-wire SPI, I2C, 4-bit parallel interface and 8-bit direct output
  • User-selectable active edge IRQ output signal
  • Active high enable input

In addition to the EM6420 Touch Interface IC, EM is able to offer complete solutions (IC + electrodes) and can support development and production of optimized electrode designs on various dielectric substrates.

Applications

  • Mobile phones
  • PC peripherals
  • White goods, home automation
  • Gaming and activity tracker devices
  • Lighting - Sliders for dimming