MAX7219CNG LED Matrix/Digit Display Driver - MAX7219
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MAX7219 (MAXIM ȸ»ç¿¡¼­ ¸¸µê)´Â 64°³ÀÇ LED¸¦ ÄÁÆ®·ÑÇϰųª 8°³ÀÇ ¼¼ºì¼¼±×¸ÕÆ®¸¦ Á¦¾îÇÒ ¼ö ÀÖ´Â ICÀÔ´Ï´Ù. 

¾ÆµÎÀ̳ëÀÇ SPI ÀÎÅÍÆäÀ̽º¸¦ ÀÌ¿ëÇÏ¿© ¼¼°³ÀÇ Çɸ¸À¸·Î 64°³ÀÇ LED¸¦ Á¦¾îÇÒ ¼ö ÀÖµµ·Ï ÇÏ´Â À¯¿ëÇÏ°í À¯¸íÇÑ Ä¨ÀÔ´Ï´Ù. 

¸ÕÀú, ±âº»ÀûÀ¸·Î MAX7221 ȤÀº MAX7219ÀÇ È¸·Î´Â ´ÙÀ½°ú °°°í, ¾ÆµÎÀ̳ë¿Í ¾Æ·¡¿Í °°ÀÌ ¿¬°áÇÒ ¼ö ÀÖ½À´Ï´Ù.  

 

 

 

¿ÞÂÊÀÇ ¾ÆµÎÀ̳ë ÇÉ ¼¼°³¿Í GND¸¦ ÀÌ¿ëÇÏ¿© MAX7219¿¡ ¿¬°áÇÏ°í, À̸¦ LED ¸ÅÆ®¸¯½º (¿À¸¥ÂÊ¿¡ ¿¬°áÇϴ ȸ·ÎÀÔ´Ï´Ù)¿¡ ¿¬°áÇÑ °ÍÀÌ°í, MAX7219 ÀÌȸ¿¡ ¼¼ °³ÀÇ ¼ÒÀÚ°¡ ÇÊ¿äÇѵ¥, C1, C2 ÀÇ Ä³ÆнÃÅÍ¿Í ÀúÇ× RSetÀÔ´Ï´Ù. ijÆнÃÅÍ´Â Àü¿ø°ø±Þ½ÃÀÇ ³ëÀÌÁ ÁÙÀ̱â À§Çؼ­ ÇÊ¿äÇÕ´Ï´Ù. ijÆнÃÅ͸¦ »ý·«Çؼ­ µ¿ÀÛÀº ÇÒ ¼ö ÀÖÀ¸³ª, °£È¤ ¹ß»ýÇÏ´Â ¿¡·¯¸¦ ÀâÀ» ¼ö ¾ø±â ¶§¹®¿¡ ¹Ýµå½Ã ijÆнÃÅ͸¦ »ç¿ëÇؾßÇÕ´Ï´Ù. ÀúÇ× RSetÀº LED¿¡ È帣´Â Àü·ù¿¡ Á¦ÇÑÀ» Çϱâ À§ÇÑ °ÍÀ¸·Î, »ç¿ëµÇ´Â Àü·ù¿¡ ¸Â°Ô Àû´çÇÑ ÀúÇ×°ªÀ» »ç¿ëÇÏ¿©¾ß ÇÕ´Ï´Ù. MAX7219´Â 5V Àü¿øÀÌ ÇÊ¿äÇѵ¥, ¾ÆµÎÀ̳뿡¼­ ¹ÞÀ» ¼ö ÀÖÁö¸¸, LED ¸ÅÆ®¸¯½º °°ÀÌ ¿©·¯°³¸¦ »ç¿ëÇؾßÇÏ´Â °æ¿ì¿¡´Â ¿ÜºÎÀü¿øÀ» »ç¿ëÇÏ°í, GND¸¸ ÅëÀϽÃÄÑÁÖ´Â °ÍÀÌ ÁÁ½À´Ï´Ù. 

 

¸¸¾à, ¸î°³ÀÇ MAX7219¸¦ »ç¿ëÇÏ¿© ´Ù¼öÀÇ LED¸¦ Á¦¾îÇϱâ À§Çؼ­´Â (Cascading), DOutÀ» ´ÙÀ½ µå¶óÀ̹öÀÇ DIn¿¡ ¿¬°áÇÏ¸é µË´Ï´Ù. ±×¸®°í, Clk, CS´Â ù¹ø° µå¶óÀ̹ö¿Í °°ÀÌ ¿¬°áÇÒ ¼ö ÀÖ½À´Ï´Ù. ´Ù¸¸, ÄÉÀ̺íÀÇ ±æÀÌ°¡ ±æ¸é ¿¡·¯°¡ ¹ß»ýÇÒ ¼ö Àֱ⠶§¹®¿¡ 10cm À̳»·Î ÇÏ´Â °ÍÀÌ ÁÁ½À´Ï´Ù. 

´ÙÀ½Àº LED ¸ÅÆ®¸¯½º ¿¬°á¹ýÀÔ´Ï´Ù. 

À§¿¡¼­ ¿À¸¥ÂÊÀÇ Ãâ·ÂºÎºÐÀ» º¸¸é Seg~Dig ÇɵéÀÌ Àִµ¥, ÀÌ´Â 8x8 LED ¸ÅÆ®¸¯½º¿¡ ¿¬°áµÉ ¼ö ÀÖ½À´Ï´Ù. 

 

¸¶Âù°¡Áö·Î, ¼¼ºì¼¼±×¸ÕÆ®¿Í ¿¬°áÇÏ´Â ¹æ¹ýÀº ´ÙÀ½°ú °°½À´Ï´Ù. 

 


When you need some help driving a lot of LEDs, the MAX7219 is the best friend you could hope for. Many of us know that if you want to control a lot of LEDs, you'll want to use 
multiplexing, a technique that lets you control 64 LEDs (say) with only 16 pins (8x8). The annoying thing about 'plexing is that you need to use 8 power transistors(or a power register/latch, that can supply over 100mA per pin) AND you have to constantly refresh the display to keep the image stable. If you need to get something together quickly, or don't want to bother with writing all that code, and especially if you want clean wiring, this chip is the one-stop-solution! 

The MAX7219 does all the control and refresh work for you in driving either an 8x8 matrix display or 8 x 7-segment displays (usually these also have a dot so its really an 8-segment display) - 64 LEDs total. All you have to do is send it serial commands via the 4-pin SPI interface and it will auto-magically take care of the rest. Wiring is simplified as well, you only need to set the current level for all LEDs with a single resistor instead of 8 and you can also dim the entire display digitally. It's a thru-hole chip so you can use it in any breadboard, perfboard or other project, although if you're soldering it in, we suggest using a socket. 

The Arduino playground has a nice set of tutorials introducing the MAX7219 and 8x8 LED matrices
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