MAX6954

4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

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Status Explanations for product status codes

Part Number Status
MAX6954 Active: In Production. See Ordering Information for details.

Description

The MAX6954 is a compact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an SPI™- or QSPI™-compatible 4-wire serial interface. The serial interface may be cascaded through multiple devices. The MAX6954 drives up to 16 digits 7-segment, 8 digits 14-segment, 8 digits 16-segment, or 128 discrete LEDs, while functioning from a supply voltage as low as 2.7V. The driver includes five I/O expander (or GPIO) lines, some or all of which may be configured as a key-switch reader, which automatically scans and debounces a matrix of up to 32 switches.

Included on chip are full 14- and 16-segment ASCII 104-character fonts, a hexadecimal font for 7-segment displays, multiplex scan circuitry, anode and cathode drivers, and static RAM that stores each digit. The maximum segment current for the display digits is set using a single external resistor. Digit intensity can be independently adjusted using the 16-step internal digital brightness control. The MAX6954 includes a low-power shutdown mode, a scan-limit register that allows the user to display from 1 to 16 digits, segment blinking (synchronized across multiple drivers, if desired), and a test mode, which forces all LEDs on. The LED drivers are slew-rate limited to reduce EMI.

For a 2-wire interfaced version, refer to the MAX6955 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 340kB)
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Key Features

  • High-Speed 26MHz SPI/QSPI/MICROWIRE™-Compatible Serial Interface
  • 2.7V to 5.5V Operation
  • Drives Up to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types
  • Drives Common-Cathode Monocolor and Bicolor LED Displays
  • Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits
  • Automatic Blinking Control for each Segment
  • 10µA (typ) Low-Power Shutdown (Data Retained)
  • 16-Step Digit-by-Digit Digital Brightness Control
  • Display Blanked on Power-Up
  • Slew-Rate Limited Segment Drivers for Lower EMI
  • Five GPIO Port Pins Can Be Configured as Key-Switch Reader to Scan and Debounce Up to 32 Switches with n-Key Rollover
  • IRQ Output when a Key Input Is Debounced
  • 36-Pin SSOP and 40-Pin DIP and TQFN Packages
  • Automotive Temperature Range Standard
  • Underwriters Laboratories (UL) Recognized
 

Applications/Uses

  • Audio/Video Equipment
  • Automotive Electronics
  • Bar Graph Displays
  • Panel Meters
  • Set-Top Boxes
  • White Goods
   

Key Specifications:

Display Drivers
Part Number LCD or LED Display Type Interface Fonts Segment Blinking VSUPPLY
(V)
VSUPPLY
(V)
Budgetary
Price
min max See Notes
MAX6954  LED Common Cathode Serial SPI 26Mbit
104 char ASCII
Hexadecimal
Yes 2.7 5.5 $9.10 @1k
See All Display Drivers (48)

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

MAX6954: Typical Operating Circuit
Typical Operating Circuit

More Information

New Product Press Release   2002-05-31 ]
The MAX6954/MAX6955 Connection Scheme Tool

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Information Index

Document Ref.: 19-2419 Rev 4; 2009-04-14
This page last modified: 2013-12-09