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I want to control 24 single LEDs with a MAX7219. I understand the concept of the matrix and I know how to control the MAX7219.

What I don't understand is how to read the datasheet correctly and work out what the specifications of the LEDs need to be.

TonyM
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prepzel
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1 Answers1

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Table 11 on page 11 gives some values for ISEG and VLED.
enter image description here

So if you're using an LED with a forward voltage of 3.0V, use a resistor or 24.5 kOhm for a forward current of 20 mA. You can use any LED with a forward current 10-40 mA and a forward voltage of 1.5-3.5 V.
You can probably go under those values, ie less than 10mA or 1.5V, but you'd have to guess a bit for your value of RSET. I wouldn't try and exceed them without using an external driver as the datasheet recomends

LordTeddy
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