I've assembled two MAX7219 drivers and used just one Rset resistor for both. During prototyping I forgot about a necessity to use separate resistors for each MAX7219. It works perfectly. But I've got some doubts about any side effects in this schematic. Does anyone know what is under the hood of …

Well, it almost certainly does not work "perfectly". Given that the ICs are closely matched, the two MAX7219s are sharing the current from the Rset resistor, so it would be as if each has a resistor of twice that value and is driving half the nominal current to the displays. But it probably is not…

Two MAX7219 with common Iset resistor

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anon57585045 November 26, 2021, 11:10pm 5

What is the difficulty in adding the additional resistor?

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Two MAX7219 with common Iset resistor

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