Capacitive touch/proximity switch - NXP Semiconductors
Description
PCF8883
Rev.
01 — 16 October 2009
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Capacitive proximity switch with auto-calibration, large voltage operating range and very low power consumption
Product data sheet
1.
General description
The integrated circuit PCF8883 is a capacitive 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
I I I I I I I I I I I I I I 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 µA, 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 (other packages available on request for larger quantities)
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in Section 16.
NXP Semiconductors
www.
DataSheet4U.
com
PCF8883
Capacitive proximity switch with auto-calibration
3.
Applications
I Proximity detection I Proximity sensing in N Mobile phones N Portable entertainment units I Switch for medical applications I Switch for use in explosive environments I Vandal proof switches I Transportation: Switches in or under upholstery, leather, handles, mats, and glass I Buildings: switch in or under carpets, glass, or tiles I Sanitary applications: use of standard metal sanitary parts (e.
g.
tap) as switch I ...
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