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)