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ELM405P Datasheet(PDF) 10 Page - ELM Electronics |
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ELM405P Datasheet(HTML) 10 Page - ELM Electronics |
10 / 10 page Figure 8 below shows how the ELM405 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 ELM405 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 Example Application Figure 8. Connecting the ELM405 to an AD5220 10 of 10 ELM405DSA Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com ELM405 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 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 ELM405. Connect pullup resistors to your rotary encoder, connect the encoder signals to the ELM405, then connect the ELM405 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! |
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