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Application Notes

Debounce High Voltage Inputs with LogiSwitch NoBounce ICs

Easy method to use low-cost resistor networks to scale switch input voltage to LogiSwitch NoBounce™ ICs.

Debounce High Voltage Inputs with LogiSwitch NoBounce ICs

LogiSwitch NoBounce IC Application Examples

Eliminating the inconvenience of contact bounce is only the beginning for LogiSwitch. This section will show some of the advantages of using LogiSwitch NoBounce™ debouncer chips in modern applications. The LogiSwitch Handshake feature brings a new dimension to switch service processing.

Please note that some of the real-time advantages shown in these applications are only possible with the unique LogiSwitch handshake protocol. Use of the handshake protocol is covered in detail in the IC User Guide and the Bounce-Free Switch User Guide.

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The Five Basic Methods for Eliminating Switch Bounce

This tutorial is to demonstrate all five methods for debouncing switches using single pole-single throw, or single pole-double throw switches. The guide includes the two methods for single pole-double throw (SPDT) switches which require no output delay and the two best methods for interfacing with the simpler single pole-single throw (SPST) switches

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LogiSwitch NoBounce Handshake Protocol for Ultra-Fast Ultra-Simple Coding

The LogiSwitch NoBounce™ switches and the LS100 Series of debounce ICs provide an exclusive feature that dramatically speeds up switch service transactions and completely eliminates the necessity of polling for switch release to terminate the cycle.

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LS100 Series NoBounce with Handshake IC Users Guide

The LS100 line of Ultra-Fast Response Debouncer ICs provides the circuit designer with the unique LogiSwitch NoBounce™ technology adaptive debounce logic and powerful handshake protocol for carefree, bounce-free, delay-free, and poll-free operation.

Adaptive debounce expands the debounce cycle to fix switch bounces of any duration without the use of external passive components, calculations, or user-provided timing components. It is implemented using ultra-fast internal clocking and advanced bounce monitoring.

A feature exclusive to LogiSwitch is immediate output change with no delay on both actuation and release of the switch. The active high output mirrors the switch input in non-handshake cycles with the bounce/noise removed.

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LS10 Series NoBounce IC Users Guide

The LogiSwitch LS10 Series of High Noise Immunity Debouncer/Noise Filter ICs was designed for trouble-free use in the most severe electrically hostile environments.

The LS10 Series of LogiSwitch debouncer/noise filter chips features low-impedance 25 ms totem-pole outputs for each channel. Outputs and inputs are of the same polarity and may be selected for use as active high or active low. The LS10 Series utilizes LogiSwitch’s proprietary NoBounce™ technology resulting in a high level of noise immunity. Noise spikes of less than 20 ms duration are prohibited from starting or terminating a cycle.

The input of each channel includes an internal pull-up resistor so the SPST interface requires just one pin (NO or COM) tied to ground and the other to a channel input of the device. All outputs are delayed for a period of 20 ms + bounce time on both activation and release regardless of the bounce duration.

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LogiSwitch NoBounce Switches with Handshake Users Guide

LogiSwitch provides a series of pushbutton and limit switches incorporating the same unique NoBounce™ adaptive debounce algorithm and handshake protocol as implemented in the LogiSwitch LS100 series line of bounce-free ICs.

All LogiSwitch switch products provide a selection of three different output formats:

  1. Normally Low/Handshake (NL/HS) pin provides an active-high handshakeable output.
  2. Normally High (NH) pin provides a low-impedance active-low output.
  3. Toggle (TG) pin changes state each time the switch is actuated. (powers-up high)

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