Hi guys, i`ve a little problem with my MAX7219 and a 5 digit 7segment display. Here are all necessary facts: Set-Up: 2-layer PCB, MAX7219 as SIOP24 SMD Package, Current Resistor is 33k, 5V Power Supply over VCC Plane with decoupling capacitor, ground plane. Connection between µC and 7219 is less…

MAX7219 keeps turning all LEDs ON on initial power up

Jobi-Wan May 11, 2019, 3:06pm 5

I bet the pullup on CS would prevent the MAX from clocking in garbage during startup while the micro resets.

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