OM11057 Datasheet, PDF (1/2 Pages) NXP Semiconductors – Fast, easy evaluation of capacitive sensors

NXP capacitive sensor
demo board OM11057
Fast, easy evaluation of capacitive
sensors
This board, equipped with an LCD driver and controlled by a Cortex-M0™ MCU, demonstrates the
features of two capacitive sensor devices.
Key features
`` 8-channel capacitive sensor PCF8885
`` 2-channel capacitive sensor PCA8886
`` LCD/LED driver PCF8536
`` Cortex-M0 LPC1111 with 8 KB flash memory
`` Standalone operation
`` Powered via two AA batteries or USB
`` Software modifications via LPC-Link
`` Sounder for audible feedback
Applications
`` Hermetically sealed keyboards
`` Proximity detection
`` Switches in medical and explosive environments
`` Vandal-proof switches
`` Gaming devices
`` Portable communications
`` Fixed and mobile entertainment systems
`` White goods
`` Automotive (e.g. passive keyless entry)
The NXP OM11057 demonstrates the features of the PCF8885,
an 8-channel capacitive sensor, the PCF8886, a 2-channel
capacitive proximity sensor and the PCF8536, an LCD/LED`
controller which can be used to drive an LCD and the
accompanying backlight. The board is controlled by a`
low-cost, 32-bit Cortex-M0 microcontroller LPC1111. `
An LPC-Link debug probe is also included with the board,
so designers can easily modify the firmware or reprogram
the LPC1111 using NXP’s low-cost LPCXpresso development
platform.
The sensor PCF8885 is configured to control a total of `
20 sensors: the slider (eight channels), the wheel (eight
channels), and four buttons. The device’s very high sensitivity
delivers reliable operation, even though it’s covered by
plexiglass (acrylic glass). The proximity sensor PCA8886
uses one of its two channels to detect whether a hand is
approaching the controls. The other channel can be connected
to an external sensor. The LCD/LED driver PCF8536 controls
both of the board’s LCDs using a multiplex rate of eight.