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 st atic cap acit ances (as opposed to dynamic capacit ance changes)
are automatically compensated using continuous auto-calibration. Remo te sensing plates
(for example, cond ucti ve fo ils ) can be conn ected 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 meth od
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
~10A)
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.
PCF8885 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 3 — 17 March 2014 2 of 45
NXP Semiconductors
PCF8885
Capacitive 8-channel touch and proximity sensor with auto-calibration
3. Applications
Replacing mechanical switches
Hermetically sealed keys on a keyboard
Switches for medical applications
Switches for use in explosive environments
Audio control: on/off, channel, volume
Sliders and wheel-switches
Vandal proof switches
Switches in or under the upholstery, leather, handles, mats, carpets, tiles and glass
Switches for home automation
Use of standard metal sanitary parts (for example a tap) as switch
Portable communication and entertainment units
White goods control panel
4. Ordering information
4.1 Ordering options
5. Marking
Table 1. Ordering information
Type number Package
Name Description Version
PCF8885TS TSSOP28 plastic small outline package; 28 leads;
body width 4.4 mm
PCF8885TS
Table 2. Ordering options
Product type number Orderable part number Sales item
(12NC)
Delivery form IC
revision
PCF8885TS/1 PCF8885TS/1,118 935296171118 tape and reel, 13 inch 1
Table 3. Marking codes
Type number Marking code
PCF8885TS/1 PCF8885TS