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1. General description

The integrated circuit PCF8883 is a capacitive touch and proximity 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 directly to the IC1 or remotely using a coaxial

cable.

2. Features and benefits

? Dynamic proximity switch

? Digital processing method

? Adjustable sensitivity, can be made very high

? Adjustable response time

? Wide input capacitance range (10 pF to 60 pF)

? Automatic calibration

? A large distance (several meters) between the sensing plate and the IC is possible

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

? Designed for battery powered applications (IDD = 3 ?A, typical)

? Output configurable as push-button, toggle, or pulse

? Wide voltage operating range (VDD = 3 V to 9 V)

? Large temperature operating range (Tamb = ?40 ?C to +85 ?C)

? Internal voltage regulator

? Available in SOIC8 and wafer level chip-size package

3. Applications

? Proximity detection

? Proximity sensing in

? Mobile phones

? Portable entertainment units

? Switch for medical applications

? Switch for use in explosive environments

? Vandal proof switches

? Transportation: Switches in or under upholstery, leather, handles, mats, and glass

? Buildings: switch in or under carpets, glass, or tiles

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

? Hermetically sealed keys on a keyboard