Datasheet

1. General description
The integrated circuit PCF8885 is a capacitive 8-channel touch and proximity sensor 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
(for example, conductive foils) can be connected to the IC
1
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. Features and benefits
 Dynamic touch and proximity sensor with 8 sensor channels
 Support for matrix arrangement of sensors
 Sensing plates can be connected remotely
 Adjustable response time
 Adjustable sensitivity
 Continuous auto-calibration
 Digital processing method
 Can cope with up to 6 mm of acrylic glass
 Direct and latching switch modes
 I
2
C Fast-mode Plus (Fm+) compatible interface
 Two I
2
C-bus addresses
 Cascading of two ICs possible
 Interrupt signaling over I
2
C-bus
 Interrupt output
 Large voltage operating range (V
DD
= 2.5V to 5.5V)
 Sleep mode (I
DD
< 100 nA)
 Low-power battery operation possible (I
DD
~10A)
 Operating temperature range (T
amb
= 40 C to +85 C)
 Available in TSSOP28 and SOIC28 package
PCF8885
Capacitive 8-channel touch and proximity sensor with
auto-calibration and very low power consumption
Rev. 3 — 17 March 2014 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 22 on page 38.