Capacitive Touch Sense Controller

Related Products

Reference Design LogoCapacitive sensing is a technology based on capacitive coupling, which takes human body capacitance as input. Capacitive touch sensors are used in many devices such as laptop trackpads, digital audio players, computer displays, mobile phones, mobile devices, tablets and more. Capacitive sensors are preferred for their versatility, reliability and robustness, unique human-device interface and cost reduction over mechanical switches.

The Capacitive Touch Sense Controller reference design demonstrates touch sensing and control using the iCE40™ FPGA. This design implements four touch sense buttons with outputs to LEDs.

This reference design is implemented in Verilog. The Lattice iCEcube2™ Place and Route tool integrated with the Synplify Pro synthesis tool is used for implementation of the design. The design can also be targeted to other iCE40 family members

Features

  • Four capacitive touch sensitive user buttons
  • Up to four LED toggle control outputs
  • 3.3 MHz frequency operation
  • Touch sensitive resolution up to 300nsWrites the configuration register and configures baud rate, data length, enables/disables parity and parity type (even/odd)

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Block Diagram

Performance and Size

Device Family Utilization (LUTs) Language fMAX (MHz) I/O Pins Architectural Resources
iCE40™ 83 Verilog >170 9 N/A

Performance and resource utilization characteristics are generated using iCE-40LP1K-CM121 with iCEcube2 design software.

Note: The performance and design sizes shown above are estimates only. The actual results may vary depending upon the chosen parameters, timing constraints, and device implementation. See the design's documentation for details. All coding and design work was done on a PC platform unless noted otherwise.

Documentation

Quick Reference
Technical Resources
Downloads
TITLE NUMBER VERSION DATE FORMAT SIZE
CapSense Demo for iCEblink40 Evaluation Kits - User's Guide
UG64 1.0 10/17/2012 PDF 2.1 MB
TITLE NUMBER VERSION DATE FORMAT SIZE
CapSense Demo for iCEblink40 Evaluation Kits - User's Guide
UG64 1.0 10/17/2012 PDF 2.1 MB
TITLE NUMBER VERSION DATE FORMAT SIZE
CapSense Demo for iCEblink40-HX1K Evaluation Kit
2.0 7/18/2013 RAR 1.5 MB
CapSense Demo for iCEblink40-LP1K Evaluation Kit
2.0 7/18/2013 RAR 1.5 MB


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