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[...] using a regular 595 (rated for 35mA per pin) to source all his rows. Worst case for him is 56 x 20mA with LEDS on in a row. It makes my head hurt on why that isn't exploding.
For me it would only be 16 x 20mA worst case because I will have a separate register per matrix, but two colors per pixel. Is this within the scope of sanity that this will work? Is the other guy getting away with it because scanning means it's only ever at 1/8 duty cycle? If that's the case, i'll have to break out the enable pins on the shift registers, so the LEDS aren't left 'on' during programming and power up.
Hi,Perhaps you could find room for 8 SOT-23 size MOSFET complimentary pairs to be driven by a low current shift reg?
Can someone whip out a miracle and show me a TPIC6C595 equivalent high current sourcing shift register? plz!