The MAX6921AUI+T from Maxim Integrated is a high-performance, 20-output, serial-interfaced vacuum fluorescent display (VFD) tube driver designed to interface microprocessors to VFD tubes with minimal external components. This driver is well-suited for applications in consumer electronics, automotive displays, industrial control panels, and anywhere VFD technology is utilized.

Key Features

• Serial Interface: The device uses a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and most other serial data interfaces, allowing for simple integration with a wide range of microcontrollers.
• High Voltage Output: It is capable of operating at up to 76V, making it suitable for driving large VFD panels which require higher voltages for proper operation.
• Output Current: Each of the 20 outputs can sink up to 45mA, providing sufficient current for most VFD applications.
• Integrated Features: The MAX6921AUI+T includes an on-chip 32x8 static RAM, 20 open-drain output drivers, a high-voltage level shifter, and a 33MHz serial interface.
• Daisy-Chainable: Multiple devices can be daisy-chained to control more than 20 digits using a single serial port.

Applications

The versatility of the MAX6921AUI+T makes it ideal for a broad range of applications, including:

• Automotive Displays
• Industrial Control Panels
• Consumer Electronics
• Point of Sale Terminals
• Test and Measurement Equipment

Package and Reliability

The device comes in a compact 28-pin TSSOP package, which is RoHS compliant and specified over the -40°C to +85°C extended temperature range. Its small footprint and high integration level make it an excellent choice for space-constrained applications. Maxim Integrated's commitment to quality ensures that the MAX6921AUI+T provides reliable performance for the demanding requirements of VFD-driven displays.

For designers and engineers looking to build state-of-the-art VFD control systems, the Maxim Integrated MAX6921AUI+T offers a robust, efficient, and flexible solution that can reduce component count, board space, and overall system cost.