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ELM401P Datasheet(PDF) 2 Page - ELM Electronics |
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ELM401P Datasheet(HTML) 2 Page - ELM Electronics |
2 / 8 page ELM401 Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com Pin Descriptions 2 of 8 All rights reserved. Copyright 2011 Elm Electronics. Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve reliability, function, or design. 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 for more information. A (pin 2) This input is usually connected to what is normally known as the ‘A’ signal from a rotary (quadrature) encoder. An external pullup resistor is required for the encoder (a typical value is 10 K Ω), but no external capacitors are needed (as the internal debounce circuitry provides the filtering). B (pin 3) This input is usually connected to what is normally known as the ‘B’ signal from a rotary (quadrature) encoder. An external pullup resistor is required for the encoder (a typical value is 10 K Ω), but no external capacitors are needed (as the internal debounce circuitry provides the filtering). Sw (pin 4) This input may be used to debounce any standard mechanical contact (from a switch or relay). The circuitry uses simple set/reset logic to control a timer, so is not suitable for use with the A or B signal from a rotary encoder (as those signals continue to generate sliding noise while the contact is closed). Sw out (pin 5) This output is the debounced representation of the signal that is at pin 4. B out (pin 6) This output is the debounced representation of the signal that is at pin 3. A out (pin 7) This output is the debounced representation of the signal that is at pin 2. VSS (pin 8) Circuit common is connected to this pin. This is the most negative point in the circuit. ELM401DSB |
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