Capacitive Switch - MS8885B

Product Specification

1.General Description：

    The integrated circuit MS8885B is a capacitive 8-channel proximity switch that uses a patented (EDISEN) method to detect a change in capacitance on remote sensing plates.

    Changes in the static capacitances (as opposed to dynamic capacitance changes) are automatically compensated using continuous auto-calibration. Remote sensing plates (e.g.conductive foil) can be connected to the IC using coaxial cable.

    The eight input channels operate independently of each other. There is also a built in option for a matrix arrangement of the sensors (interrupt generation only when two channels are activated simultaneously, suppression of additional channel outputs when two channels are already active).

2.Applications：

• Hermetically sealed keys on a keyboard

• Switch for medical applications

• Switch for use in explosive environments

• Vandal proof switches

• Automotive: Switches in or under the upholstery, leather, handles, mats and glass

• Portable communication & entertainment units

• White goods

• Buildings: Switch in or under carpets, glass or tiles

• Sanitary applications: Use of standard metal sanitary parts (e.g. tap) as switch

3.Typical application：

4.Features：

• Dynamic proximity switch with 8 sensor channels

• Support for matrix arrangement of sensors

• Direct and latching switch modes

• Digital processing method

• Continuous auto-calibration

• Sensing plates can be connected remotely

• I2C Fast-mode Plus (Fm+) compatible interface

• Interrupt output

• Clock and interrupt cascading for two IC’s possible

• Address LSB can be configured via external pin (two IC’s can be addressed)

• Low-power battery operation possible (IDD ~ 10μA)

• Sleep mode (< 100nA)

• Adjustable response time

• Adjustable sensitivity

• Large voltage operating range (VDD = 2.5 to 5.5V)

• Temperature operating range Tamb = -40°C to 85°C

• Internal voltage regulator

• Available in 5x5mm QFN28 (other packages available for larger quantities)