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ELM402

ELM
Part Number ELM402
Manufacturer ELM
Description Rotary Decoder
Published Dec 20, 2013
Detailed Description ELM402 Rotary Decoder - 2 wire 2x Interface Description The ELM402 is an 8 pin integrated circuit that is used to conver...
Datasheet PDF File ELM402 PDF File

ELM402
ELM402

Overview
ELM402 Rotary Decoder - 2 wire 2x Interface Description The ELM402 is an 8 pin integrated circuit that is used to convert the signals from a rotary encoder into a series of up and down output pulses.
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 ELM402, as this is all performed within the integrated circuit.
After debouncing the encoder signals, the ELM402 then determines the direction of shaft rotation, and generates the appropriate pulses at the Up or Down output pins.
The duration of these pulses can be selected for either 0.
2 or 2.
0 msec.
The ELM402 provides 2x decoding of a rotary encoder signal.
If your application requires 4x decoding, please see the ELM403 (it is identical to the ELM402 in every respect, except that it provides 4x decoding).
Features • • • • • • • Low power CMOS design Wide supply range – 2.
0 to 5.
5 volts Complete debouncing of the encoder inputs No external filtering needed 2x decoding Startup delay timer High current drive outputs Connection Diagram PDIP and SOIC (top view) VDD 1 2 3 4 8 7 6 5 VSS Up Down Output Invert Applications • • • • Digital audio potentiometer controls Variable voltage or temperature circuits Positioning controls Tuning circuits A B Pulse Width Block Diagram VDD A 2 Debounce Circuit Direction Decoding Debounce Circuit Output Logic 7 Up VDD B 3 6 Down Rotary Encoder Pulse Width 4 5 Output Invert ELM402DSA Elm Electronics – Circuits for the Hobbyist www.
elmelectronics.
com 1 of 9 Free Datasheet http://www.
datasheet4u.
com/ ELM402 Pin Descriptions VDD (pin 1) This pin is the positive supply pin, and should always be the most positive point in the circuit.
Internal circuitry connected to this pin is used to provide power on reset of the internal logic, so an external reset signal is not required.
Refer to the Electrical Characteristics se...


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