1734-VHSC24

1734-VHSC24

1734-VHSC24

1734-VHSC24

MAX7219有14个可寻址命令寄存器：8个位驱动寄存器和6个状态寄存器。地址排列如表2所示。MAX7219提供了段选码和BCD解码两种方式。解码方式寄存器数据位都设为1时，为BCD解码方式，都为0时为段选码方式。工作在解码方式时，LED
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可显示数字0~9及“—”，“E、F、H、L、P”等字符和空显示。写寄存器时，只要在对应的数据位的低4位写入“0H”-“FH”即可，与数据位高4位无关，数据位最高位来设定小数点状态，置1点亮小数点，否则为0。段选码方式是通过将数码管对应数据位写“1”来使该段亮。
  MAX7219还有6个状态寄存器。亮度寄存器来控制LED的亮度，这种软件亮度控制可代替硬件限流的亮度控制方法。扫描限制寄存器用于控制扫描频率。停机寄存器控制MAX7219的工作状态，该寄存器数据格式为“×0”时，进入关闭正常工作状态，但可受测试控制寄存器控制；数据格式为“×1”时，进入正常工作状态。显示测试寄存器为“×0”时，显示驱动器进入正常工作状态；寄存器为“×1”时，为测试状态，此时LED应全亮状态。空操作寄存器用在7219串联时，只改变某片7219驱动的LED，但不用改变其他显示区。它可使7219进行空操作，保持LED的原状。
  MAX7221与MAX7219基本一致，只是7221段驱动有转换速率限制，以此来减小EMI，而且它更专业化用于SPI。7219则通用性较强。

4.实例介绍
  笔者在开发的一个电机调速系统中，显示部分采用的是TMS320F240的SPI外接MAX7219来驱动LED动态显示。

PAYNE ENGINEERING TEMPERATURE CONTROL 18TBP-2-5

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700-HRM12TA17 ALLEN BRADLEY ON-DELAY TIMING RELAY

9012 GCW-1 SQUARE D PRESSURE SWITCH NEW NOT IN BOX

Z-25142 ALLEN BRADLEY COMPLETE OPERATING HEAD NEW

43007 BRAD HARRISON MINI-CHANGE RECEPTACLE NEW

EE-SPW311 OMRON PHOTO MICROSENSOR NEW IN BOX

30079 9000 SCHRADER BELLOWS QUICK EXHAUST VALVE NEW

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4436B61512060 FARADAY BELL W/6" GONG NEW

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770-1 WHITE-RODGERS AIR SWITCH NEW IN BOX

700-PB40 ALLEN BRADLEY SECOND DECK CONTACT RELAY NEW

750-403 WAGO DIGITAL INPUT, 4 CHANNEL 24V DC NEW IN BOX

BZ-2RW863-A2 MICRO SWITCH NEW

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1492-GH100 ALLEN BRADLEY SINGLE POLE CIRCUIT BREAKER

1747-C11 AB PROCESSOR TO ISOLATED LINK CABLE NEW

871C-J4B12 ALLEN BRADLEY PROXIMITY SWITCH NEW IN BOX

700DC-P400Z24 ALLEN BRADLEY RELAY

509-TOD SERIES B SIZE 00 NON REVERSING MOTOR STARTER 

90-102 STEVECO SWITCHING RELAY NEW IN BOX

V600-H11 OMRON AMPLIFIER READ/WRITE HEAD W/10M CABLE

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E&E POWERED ROTA-SHAFT E-34212-R-4041 

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