Capacitive Switch

Product Attribute:

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Production Description:

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

•  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 ICs possible
•  Address LSB can be configured via external pin (two ICs can be addressed)
•  Low-power battery operation possible (IDD ~ 10A)
•  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)