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  • Multiplexing LED Drive and 4x4 Keypad Sampling
    Many applications require driving LEDs along with an interface to a keypad. Implementing such designs usually involves using up significant amounts of the processors I/O lines. This application note describes a method which uses only 16 I/O pins of a PIC16C5X microcontroller to sample a 4x4 keypad
  • Interfacing a 4x4 Matrix Keypad with an 8-Bit GPIO Expander
    it as an output. INTRODUCTION * General Purpose I/O Port Register (GPIO): The GPIO register is the data port of the MCP23X08. This application note discusses interfacing a 4x4 matrix Reading from this register reads the state of the keypad with MCP23X08 8-Bit GPIO Expander. This port pins. Writing
  • SP Solutions IVR/RADIUS Services for Calling Card, Prepaid and Other Payment Systems
    Technologies' Tenor MultiPath Switch provides effective support for RADIUS-compliant third-party IVR applications. The Tenor can relay messages from the IVR system to the caller and the caller's keypad responses to the IVR system (for account number, PIN codes, etc.). This allows all transactions
  • Implementing Wake Up on Keystroke
    Microchip's PIC16CXXX microcontroller family are ideally suited to directly interface to a keypad. The high 4-bits of PORTB (RB7:RB4) have internal pull-ups and can trigger a ?change on state? interrupt. This interrupt, if enabled, will wake the microcontroller from SLEEP. In most battery powered
  • Using the Port B Interrupt on Change as an External Interrupt
    with the software programmable weak internal pull-ups, a direct interface to a keypad is possible. This is shown in application note AN552, Implementing Wake-up on Key Stroke. Another way to use the ?interrupt on change? feature would be as additional external interrupt sources. This allows PIC16CXXX devices
  • Medical Device Link .
    system prints and applies bar-coded labels to the end or side of a microplate. The microplate labeling system features a soft touch keypad and screened label and ribbon feed paths and can interface with either a PC or handheld terminals. Labels contain readable information for
  • Using KEELOQ (R) to generate Hopping Passwords
    The purpose of this application note is to demonstrate how KEELOQ (R) code hopping technology can be conveniently employed to implement an automatic code hopping password generator/keypad. Using a PIC12C508, the hopping code produced by an HCS300 is converted to a string of 16 hex digits
  • The Drive for Simplicity: Defining Trends in Motor Drives
    and cheaper for its customers. By combining functions and cutting part counts, ABB has reduced the size of its drives while enhancing their reliability. The company has also developed a simplified set-up procedure using a harmonized keypad and software wizards that can be used across the ABB drive

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