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Optoelectronics/Displays??

Maxim VFD controller features embedded fonts

Posted: 08 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max6853? vacuum fluorescent display? vfd controller?

The MAX6853 vacuum-fluorescent display (VFD) controller from Maxim Integrated Products Inc. features embedded fonts, multiplex timing control, and filament timing that enables users to achieve flicker-free displays.

Available in a 16-pin, 6-by-9mm QSOP, the MAX6853 uses a 2-wire, I?C-compatible bus to interface with the microprocessor and control up to 96-characters (48 grids/2 characters per grid) or 48-character (48 grids/1 character per grid), 5x7 matrix, VFDs.

A full ASCII 104-charater font and 24 characters of user-defined fonts are included on chip. Each grid features an independent 16-step brightness control. An additional cursor segment and up to four annunciators may be assigned per grid, each with independent two-phase blink control.

An internal output map works like a crosspoint switch to connect any tube-driver shift-register position to any grid or anode. The driver is therefore compatible with any VFD tube-driver combination, including chip-on-glass. The output map allows a grid to be enabled more than once and multiple grids may be enabled together to support universal displays.

The MAX6853 also provides timing to generate PWM waveforms to bridge-drive the VFD filament from a dc supply. The filament drive is synchronized to the display multiplexing to eliminate beat artifacts. Dead-clock protection is built in, protecting the display in the event of a multiplex clock failure.

Operating from a 2.7V to 3.6V supply, the MAX6853 is specified over the standard automotive temperature range and is priced at $4.17 (1,000-up).





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