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ELM408

ELM
Part Number ELM408
Manufacturer ELM
Description Rotary Decoder
Published Dec 20, 2013
Detailed Description ELM408 Rotary Decoder - 2 wire Interface Description The ELM408 is an 8 pin integrated circuit that is used to convert t...
Datasheet PDF File ELM408 PDF File

ELM408
ELM408


Overview
ELM408 Rotary Decoder - 2 wire Interface Description The ELM408 is an 8 pin integrated circuit that is used to convert the output from a rotary encoder into two signals (chip select, and up/down) that can be used to control various devices.
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 ELM408, as this is all performed within the integrated circuit.
After debouncing the encoder signals, the ELM408 determines the direction of shaft rotation, and then generates the appropriate outputs.
A write sequence can also be generated if the Write Enable input is at a high level when the outputs are generated.
The ELM408 provides both 2x and 4x decoding of a rotary encoder signal.
See the Output Waveforms section for more information.
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 and 4x decoding Can generate a write sequence Startup delay timer High current drive outputs Connection Diagram PDIP and SOIC (top view) VDD 1 2 3 4 8 7 6 5 VSS CS U/D 4x/2x Applications • • • • Digital audio potentiometer controls Variable voltage or temperature circuits Positioning controls Tuning circuits A B Write Enable Block Diagram VDD A 2 Debounce Circuit 7 VDD B 3 Direction Decoding Debounce Circuit Output Logic 6 CS U/D Rotary Encoder Write Enable 4 5 4x/2x ELM408DSA Elm Electronics – Circuits for the Hobbyist www.
elmelectronics.
com 1 of 10 Free Datasheet http://www.
datasheet4u.
com/ ELM408 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 section ...


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