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PWM intensity control for the MAX6964 LED driver

Posted: 28 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? MAX6964? PWM intensity control?

The MAX6964 is a high-output-current, 17-port LED driver with 8bit, pulse-width-modulated (PWM) intensity control. Each individual port allows up to 50mA sinking current. The maximum combined total sinking current through the ground pin is limited at 350mA. The 8bit PWM intensity control is divided into 4bits of master control applied to all ports and 4bits of individual port control. The master intensity control can be used to adjust the general-equipment LED intensity in response to ambient lighting condition changes, such as those in an automobile during daytime and night-time conditions. Individual port control can then be used to produce desired intensities according to their application needs. Alternatively, four global control bits can be used instead to simultaneously control all individual port intensities. Bits D0 through D3 of register 0x0E can be used for global or port O16 intensity control. Also, the master and individual intensity controls can be combined to produce fading effects on all ports.

This application note describes the unique features of the MAX6964 LED driver and how these features can be used properly in applications requiring intensity control. The application note also provides example programming routines showcasing the intensity-control selections for both master and individual port selections of the MAX6964. The features of LED intensity control are particularly valuable in automotive applications, in which LED intensity adjustment is required for daytime and nighttime conditions.

View the PDF document for more information.

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