The MAX6850 compact vacuum-fluorescent display (VFD) controller provides microprocessors with the multiplex timing for 7-segment, 14-segment, or 16-segment alphanumeric VFD displays up to 96 characters and controls industry-standard, shift-register, high-voltage grid/anode VFD tube drivers. The device supports display tubes using either one or two digits per grid, as well as universal displays. Hardware is included to simplify the generation of cathode bias and filament supplies and to provide up to five logic outputs, including a buzzer driver. The MAX6850 provides an internal crosspoint switch to match any tube-driver shift-register grid/anode order, and is compatible with both chip-in-glass and external tube drivers.
The MAX6850 includes an ASCII 104-character font, multiplex scan circuitry, and static RAM that stores digit, cursor, and annunciator data, as well as font data for 24 user-definable characters. The display intensity can be adjusted by an internal 16-step digital brightness control. The device also includes separate annunciator and cursor control with automatic blinking, as well as a low-power shutdown mode.
The MAX6850 provides timing to generate the PWM waveforms to drive the tube filament from a DC supply. The filament drive is synchronized to the display multiplexing to eliminate beat artifacts. The MAX6850 is compatible with SPI™ and QSPI™.
For a 2-wire interfaced version, refer to the MAX6851 data sheet.
Key Features
Applications/Uses
High-Speed 26MHz SPI-/QSPI-/MICROWIRE™-Compatible Serial Interface
2.7V to 3.6V Operation
Controls Up to 48 Grids of 7-Segment, 14-Segment, or 16-Segment Alphanumeric Digits
One Digit and Two Digits per Grid and Universal Displays Supported
16-Step Digital Brightness Control
Built-In ASCII 104-Character Font
24 User-Definable Characters
Up to Four Annunciators per Grid with Automatic Blinking Control
Separate Cursor Control with Automatic Blinking
Filament Drive Full-Bridge Waveform Synthesis
Buzzer Tone Generator with Single-Ended or Push-Pull Driver
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
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MAX6850
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX6850AEE
QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-5*
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