PCF8885 IC
Capacitive
8-channel proximity switch with auto-calibration
and very low power consumption
1. General description
The integrated circuit
PCF8885 is a capacitive 8-channel proximity switch 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 IC1 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
n Dynamic proximity switch with 8 sensor channels
n Support for matrix arrangement of sensors
n Sensing plates can be connected remotely
n Adjustable response time
n Adjustable sensitivity
u Continuous auto-calibration
u Digital processing method
u Can cope with up to 6 mm of acrylic glass
n Direct and latching switch modes
n I2C Fast-mode Plus (Fm+) compatible interface
u Two I2C-bus addresses
u Cascading of two ICs possible
u Interrupt signaling over I2C-bus
n Interrupt output
n Large voltage operating range (VDD
= 2.5 V to 5.5 V)
n Sleep mode (IDD < 100 nA)
n Low-power battery operation possible (IDD
~ 10 μA)
n Operating temperature range (Tamb = −40 °C to +85 °C)
n Available in TSSOP28 and SOIC28 package
3. Applications
n Replacing mechanical switches
n Hermetically
sealed keys on a
keyboard
n Switches for medical applications
n Switches for use in explosive environments
n Audio control: on/off, channel, volume
n Sliders and wheel-switches
n Vandal proof switches
n Switches in or under
the upholstery, leather, handles, mats, carpets, tiles
and glass
n Switches for home automation
n Use of standard metal sanitary parts (for example a tap) as switch
n Portable communication and entertainment
units
n White goods control panel
Avaiable : 20 Pcs
Harga / Price : Rp. 75.000 / Pcs
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