Capacitive Switch

1.General Description：

    The integrated circuit MS8883A is a capacitive switch that uses a patented (EDISEN) digital method to detect a change in capacitance on a remote sensing plate.

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

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 upholstery, leather, handles, mats and glass

• Portable entertainment units

• 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

• Digital processing method

• Automatic calibration

• Sensing plates can be connected remotely

• Open-drain output (P-type MOSFET, external load between pin and ground)

• Designed for battery powered applications (IHI typ. 3μA)

• Adjustable response time

• Adjustable sensitivity

• Output configurable as push-button, toggle or pulse

• Large voltage operating range (VHI = 3.0 to 9V)

• Large temperature operating range (Tamb = -40 to 85°C)

• Internal voltage regulator

• Available in SO8 package