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ELM401 - Rotary Encoder Debounce Circuit

General Description

The ELM401 is an 8 pin integrated circuit that is used to ‘debounce’ the signals from a mechanical rotary (quadrature) encoder.

The low power CMOS technology used ensures that only a very small current is required over the entire 2.0 to 5.5 volt operating range.

Key Features

  • Low power CMOS design Wide supply range.
  • 2.0 to 5.5 volts Complete debouncing of the encoder signals No external filtering needed Includes switch debouncing circuit Startup delay timer High current drive outputs Connection Diagram PDIP and SOIC (top view) VDD A 1 2 3 4 8 7 6 5 VSS A out B out Sw out.

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Datasheet Details

Part number ELM401
Manufacturer ELM
File Size 68.18 KB
Description Rotary Encoder Debounce Circuit
Datasheet download datasheet ELM401 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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ELM401 Rotary Encoder Debounce Circuit Description The ELM401 is an 8 pin integrated circuit that is used to ‘debounce’ the signals from a mechanical rotary (quadrature) encoder. The low power CMOS technology used ensures that only a very small current is required over the entire 2.0 to 5.5 volt operating range. There is no need for external filtering or debounce circuits with the ELM401, as this is all performed within the integrated circuit. The ‘A’ and ‘B’ motion sensing encoder signals are both passed through a filter then a comparator circuit, and finally a timer circuit to remove noise and contact bounce, while the switch input receives standard debounce processing. The result are three virtually noise-free signals that are suitable for direct use by an electronic circuit.