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ELM404 Datasheet(PDF) 9 Page - ELM Electronics |
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ELM404 Datasheet(HTML) 9 Page - ELM Electronics |
9 / 9 page Figure 7 below shows how the ELM404 might be used with a digital potentiometer (in this case, an AD5220 from Analog Devices). Pullup resistors of 10 K Ω are used with the rotary encoder to provide voltages for the A and B inputs. Power for the ELM404 and the AD5220 has been supplied from a common source (it must be between 2.7V and 5.5V for the AD5220), and a small capacitor has been added to ensure that the supply is filtered. Note that the output lines are directly connected to the AD5220 inputs, but we have added a 10 k Ω pullup resistor on the CS line, to ensure that it rises rapidly to the VDD level as quickly as possible after power up. This may not be absolutely necessary in this case (as the AD5220 setting only changes on the falling edge of the clock signal), but it does not hurt to add it. That’s about all there is to using the ELM404. Connect pullup resistors to your rotary encoder, connect the encoder signals to the ELM404, then connect the ELM404 to the controlled circuit. Use a common supply for all the devices, and add a small bypass capacitor across the supply line. The controlled devices can be digital pots, microprocessors, or almost any circuit that will accept CMOS signals. Enjoy! Example Application Figure 7. Connecting the ELM404 to an AD5220 9 of 9 ELM404DSA Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com ELM404 0.01µF 1 2 3 4 8 7 6 5 VDD VDD VDD 10 K Ω 10 K Ω A B rotary encoder C 10 K Ω AD 5220 1 2 3 4 8 7 6 5 H W L VDD |
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