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CapSense Matrix Keypad Solution - From Terasic Technologies | Cypress Semiconductor

CapSense Matrix Keypad Solution - From Terasic Technologies

Last Updated: 
Jan 11, 2013

Terasic Technologies
9F., No.176, Sec.2,
Gongdao 5th Rd, East Dist,
Hsinchu City - 30070.
Taiwan

  Features  
 
  • SmartSense Enabled
    • Robust noise performance
    • Strong immunity to Radio Frequency (RF) and Alternating Current (AC) noise
    • No manual tuning required
    • Supports wide range of input capacitance (5 to 40pf)
  • Emulates Mechanical Matrix Interface for compatibility in retrofit environments
    • Truth Table Interface
    • Key Scan Interface
  • Up to 16 CapSense Buttons (4x4 Matrix)
  • Flanking Sensor Suppression Configurable
  • Simultaneous Key Press Enabled
  • Auto Reset HW Configurable
  • Speaker Drive (Piezo)
 
     

  Key Applications  
 
  • Security Panels
  • Card reader keypad
  • Biometric scanner keypad
  • Fire alarm Control Panel
  • Thermostat
  • POS Terminal keypads
  • Cordless phone keypads
  • ATM Machine keypads
  • VOIP phone keypads
 
     

  Communication Interface  
 

The communication interface for this solution is GPO. This Matrix solution is backwards compatible with standard mechanical matrix overlays, offering the required output to communicate with a host processor.

This solution can emulate a typical Keypad Scan Interface similar to that of a mechanical keypad.

 
     

  Description  
 


Cypress's world leading CapSense® technology is now the easiest to use for matrix keypads. This 16 button configurable solution is ready to provide a quick time-to-market advantage for customers, and contains Cypress's SmartSense, which auto-tunes for variance in temperature, noise, and overlay thickness. SmartSense establishes, monitors, and maintains the matrix SNR (System-to-Noise Ratio) for optimal CapSense performance.

With auto-tuning, the value provided by this solution is simple: the ability to create a unique user interface solution without having to learn or utilize custom programming firmware. The Matrix Keypad is outside of a standard MCU development environment, offering pin configurable solutions for setting button sensitivity, flanking sensor suppression, and General Purpose Output (GPO) functionality. This ends the need to both tune the system in development as well as during test, saving valuable engineering resources.

The Matrix Keypad is also backwards compatible with standard mechanical matrix overlays, offering the requisite output to communicate with a host processor. Customers no longer have to define a completely new interface system for a capacitive transition, but can maintain overall system stability.

The Matrix Keypad is powered by Cypress's world leading CapSense technology, enabled with SmartSense. This potent combination provides significant value to customers who are either new to the embedded space or who lack the development time to build a capacitive system from scratch.

CapSense has led the capacitive market for years, through robust noise immunity, flexible performance, and the ability to quickly create a platform system. In Matrix applications, CapSense offers low power consumption, small form factor for layout considerations, high performance across various overlays and thickness. With the addition of SmartSense, no firmware coding is necessary to implement this functional Matrix system. The CapSense device will automatically detect a change in a parameter such as temperature and adjust in-system, eliminating the need for intensive tuning.

World leading technology that is the easiest to use makes the CapSense Matrix Keypad a simple design decision for engineers.

 
     
  Video  
     
 

use for camtasia screencasts
 
  Related Resources  
 
Product brochure
Product Datasheet
Technical Support

Phone:
+886-3- 5508800

Email:
cysupport@terasic.com

 

Contact Partner:
sales@terasic.com

Address:
9F., No.176, Sec.2,
Gongdao 5th Rd,
East Dist,
Hsinchu City - 30070.
Taiwan

Phone:
+886-3-5750880
Fax: +886-3-5726690

Webpage: www.terasic.com


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