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Maxim > Design Support > Technical Documents > Reference Designs > Display Drivers > APP 4379
Maxim > Design Support > Technical Documents > Reference Designs > Microcontrollers > APP 4379
Keywords: LED driver, constant current, sequence, 4-wire serial interface, push button, MAXQ2000, MAXQ IAR
Workbench, example code, assembler, microcontroller
REFERENCE DESIGN 4379 INCLUDES: Tested Circuit Schematic Board Available Description Software
Display Different LED Sequences Using the MAXQ2000
Microcontroller with the MAX6970 LED Driver
By: Kien Mach
Mar 23, 2009
Abstract: This note shows an application circuit and provides all the firmware required to interface the MAXQ2000
microcontroller evaluation (EV) kit to the MAX6970, an 8-port, 36V constant-current LED driver. Included in this
application note are schematics and microcontroller firmware. The example C program was written and assembled for
the MAXQ® microcontroller with the IAR Embedded Workbench®.
Overview
The MAX6970 is an 8-port, 36V constant-current LED driver that uses a 4-wire serial interface. Using this application
note, the MAX6970 can be used with the MAXQ2000 16-bit RISC microcontroller to create a variety of simple LED
sequences with the touch of a button.
Hardware Setup
The circuit discussed in this application note utilizes the MAX6970EVKIT and the MAXQ2000-KIT. The MAX6970
evaluation (EV) kit schematic is shown in Figure 1. A MAXQ2000 EV kit board is included in the MAX6970 EV kit
design. However for this application, it will be detached from the on-board MAXQ2000, since the MAXQ2000 EV kit
has pushbutton features that would otherwise be used to control the LED sequences.
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