一、概述

MAX7219/MAX7221是一種集成化的串行輸入/輸出共陰極顯示驅動器,它連接微處理器與8位數字的7段數字LED顯示，也可以連接條線圖顯示器或者64個獨立的LED。其上包括一個片上的B型BCD編碼器、多路掃描回路，段字驅動器，而且還有一個8*8的靜態RAM用來存儲每一個數據。

只有一個外部寄存器用來設置各個LED的段電流。MAX7221與SPI?、QSPI?以及 MICROWIRE?相兼容，同時它有限制回轉電流的段驅動來減少EMI（電磁干擾）。一個方便的四線串行接口可以聯接所有通用的微處理器。

每個數據可以尋址在更新時不需要改寫所有的顯示。MAX7219/MAX7221同樣允許用戶對每一個數據選擇編碼或者不編碼。整個設備包含一個150μA的低功耗關閉模式，模擬和數字亮度控制，一個掃描限制寄存器允許用戶顯示1-8位數據，還有一個讓所有LED發光的檢測模式。在應用時要求3V的操作電壓或segment blinking，可以查閱MAX6951數據資料。

二、應用

條線圖顯示 儀表面板 工業控制 LED矩陣顯示

三、管腳配置

四、功能特點

1. 10MHz 連續串行口
2. 獨立的LED 段控制
3. 數字的譯碼與非譯碼選擇
4. 150μA 的低功耗關閉模式
5. 亮度的數字和模擬控制
6. 高電壓中斷顯示
7. 共陰極LED 顯示驅動
8. 限制回轉電流的段驅動來減少EMI（MAX7221）
9. SPI, QSPI, MICROWIRE串行接口（MAX7221）
10. 24 腳的DIP 和SO 封裝

五、分類信息

芯片 工作溫度范圍 管腳封裝

MAX7219CNG 0°C to +70°C 24 Narrow Plastic DIP

MAX7219CWG 0°C to +70°C 24 Wide SO

MAX7219C/D 0°C to +70°C Dice*

MAX7219ENG -40°C to +85°C 24 Narrow Plastic DIP

MAX7219EWG -40°C to +85°C 24 Wide SO

MAX7219ERG -40°C to +85°C 24 Narrow CERDIP

五、典型應用電路

六、功能圖表

七、時序圖

MAX7219原理圖

MAX7219驅動程序

#include 
#include 


#define uchar unsigned char
#define uint  unsigned int


//定義Max7219端口
sbit Max7219_pinCLK = P2^2;
sbit Max7219_pinCS  = P2^1;
sbit Max7219_pinDIN = P2^0;
uchar code disp1[38][8]={
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//0
{0x10,0x18,0x14,0x10,0x10,0x10,0x10,0x10},//1
{0x7E,0x2,0x2,0x7E,0x40,0x40,0x40,0x7E},//2
{0x3E,0x2,0x2,0x3E,0x2,0x2,0x3E,0x0},//3
{0x8,0x18,0x28,0x48,0xFE,0x8,0x8,0x8},//4
{0x3C,0x20,0x20,0x3C,0x4,0x4,0x3C,0x0},//5
{0x3C,0x20,0x20,0x3C,0x24,0x24,0x3C,0x0},//6
{0x3E,0x22,0x4,0x8,0x8,0x8,0x8,0x8},//7
{0x0,0x3E,0x22,0x22,0x3E,0x22,0x22,0x3E},//8
{0x3E,0x22,0x22,0x3E,0x2,0x2,0x2,0x3E},//9
{0x8,0x14,0x22,0x3E,0x22,0x22,0x22,0x22},//A
{0x3C,0x22,0x22,0x3E,0x22,0x22,0x3C,0x0},//B
{0x3C,0x40,0x40,0x40,0x40,0x40,0x3C,0x0},//C
{0x7C,0x42,0x42,0x42,0x42,0x42,0x7C,0x0},//D
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x7C},//E
{0x7C,0x40,0x40,0x7C,0x40,0x40,0x40,0x40},//F
{0x3C,0x40,0x40,0x40,0x40,0x44,0x44,0x3C},//G
{0x44,0x44,0x44,0x7C,0x44,0x44,0x44,0x44},//H
{0x7C,0x10,0x10,0x10,0x10,0x10,0x10,0x7C},//I
{0x3C,0x8,0x8,0x8,0x8,0x8,0x48,0x30},//J
{0x0,0x24,0x28,0x30,0x20,0x30,0x28,0x24},//K
{0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x7C},//L
{0x81,0xC3,0xA5,0x99,0x81,0x81,0x81,0x81},//M
{0x0,0x42,0x62,0x52,0x4A,0x46,0x42,0x0},//N
{0x3C,0x42,0x42,0x42,0x42,0x42,0x42,0x3C},//O
{0x3C,0x22,0x22,0x22,0x3C,0x20,0x20,0x20},//P
{0x1C,0x22,0x22,0x22,0x22,0x26,0x22,0x1D},//Q
{0x3C,0x22,0x22,0x22,0x3C,0x24,0x22,0x21},//R
{0x0,0x1E,0x20,0x20,0x3E,0x2,0x2,0x3C},//S
{0x0,0x3E,0x8,0x8,0x8,0x8,0x8,0x8},//T
{0x42,0x42,0x42,0x42,0x42,0x42,0x22,0x1C},//U
{0x42,0x42,0x42,0x42,0x42,0x42,0x24,0x18},//V
{0x0,0x49,0x49,0x49,0x49,0x2A,0x1C,0x0},//W
{0x0,0x41,0x22,0x14,0x8,0x14,0x22,0x41},//X
{0x41,0x22,0x14,0x8,0x8,0x8,0x8,0x8},//Y
{0x0,0x7F,0x2,0x4,0x8,0x10,0x20,0x7F},//Z
{0x8,0x7F,0x49,0x49,0x7F,0x8,0x8,0x8},//中
{0xFE,0xBA,0x92,0xBA,0x92,0x9A,0xBA,0xFE},//國
};
void Delay_xms(uint x)
{
 uint i,j;
 for(i=0;i