PCF8885TS Datasheet, PDF (1/2 Pages) NXP Semiconductors – NXP capacitive proximity switches

NXP capacitive
proximity switches
PCx8885
Dynamic touch and proximity switches
with eight sensor channels
Designed for use in a wide range of popular applications, these advanced proximity
switches use a patented method for detection to deliver enhanced performance.
KEY FEATURES
`` Support for matrix arrangement of up to 28 sensors with a
single IC
`` Adjustable response time and sensitivity
`` Continuous autocalibration
`` AEC-Q100 qualified (PCA8885TS)
`` Digital processing method
`` Copes with up to 6 mm of acrylic glass or 10 mm of glass
`` I<sup>2</sup>C Fast-mode plus (Fm+) compatible interface (up to 1 MHz)
`` Can be configured as two cascaded ICs for 8 x 8 matrix
`` Interrupt via output or signaling over I<sup>2</sup>C bus
`` Large supply voltage range (V_DD = 2.5 to 5.5 V)
`` Ideal of battery-powered operation (I<sub>DD</sub> ~ 10 µA)
`` Sleep mode (I_DD < 100 nA)
The NXP PCF8885TS and PCA8885TS are capacitive 8-channel
proximity switches that use a patented method (EDISEN) to
detect a change in capacitance on remote sensing plates.
Changes in the static capacitances (as opposed to changes in
the dynamic capacitances) are automatically compensated by
using continuous autocalibration.
Both switches are well suited to a wide range of applications,
including man-to-machine interfaces and hermetically sealed
units. They deliver reliable performance in harsh environments
and can be used for system wake-up and activation. They
also support use with single buttons, slider wheels, and key
matrixes. The PCA8885TS is an AEC-Q100 qualified touch
switch optimized for use in automotive applications.
APPLICATIONS
`` White goods, washing machines, water heaters
`` Multimedia units, TVs, audio equipment
`` Self-care medical devices
`` Gaming, toys
`` Industrial equipment
`` Home automation
`` Automotive: climate control, HVAC, center stack, car
entertainment unit, mirror control
Both versions interface to the system controller via an I²C-bus
operating at up to 1 MHz (Fm+), and generate an interrupt
whenever a touch has occurred. Onboard sensor pads or
remote sensing plates, connected via coaxial cables, can be
used for touch or proximity sensing.