Friday, 27 May 2016

microcontroller - Minimize current consulption for MIDI input circuit?


I'm using a MIDI input circuit like the one shown in the schematic below. R1 is not touched as driven by the input device. R2 is fed from my internal power supply. The device is very low power so I would like to minimize current consumption as much as possible. I did notice that when having a 220 Ohm resistor the current consumption of the circuit went up. I swapped it for a 5k Ohm resistor and now it's better, however I am wondering how low can I go safely?



The datasheet has a table in it on page 2, however I'm not sure I understand it correctly. The junction of R2 and 6N138's pin 6 go into an MCU's UART module with an input resistance of about 5k Ohm.


MIDI input circuit




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