Once CS is low, this signal will be active. Pin13 (CLK): This is the CLK serial i/p pin for the CLK signal.After the 16th increasing CLK edge, this input has to go high, or else all the data will be erased. On the +Ve change of this input, the data can be latched into the CS. Pin12 (LOAD (CS)): The operation of chip select pin is, for usual operation, is allied to less logic level to CLK data in/out.These pins sink current from the display common cathode. Pins (2, 3, 5,6,7,8, 10, and 11): These are Digit Pins which are common o/p pins for all the segments of digits 0 to 7.Pin1 (DIN): DIN is the serial data i/p pin and this IC includes a 16-bit shift register where on each low to high CLK signal transition, the data can be loaded into this kind of register. This IC includes 24 pins where each pin and its functionality are discussed below. The pin configuration of MAX7219 display driver IC is shown below. This LED display driver IC comprises a 150μA low-power blackout mode, control of analog & digital brightness, a scan limit register that permits the operator to exhibit from 1- 8 digits & a test mode that strengthens all LEDs to activate. MAX7219 IC allows the operator to choose code-B decoding.
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