Features and Benefits
- 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
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.
- Audio/Video Equipment
- Bar Graph Displays
- Panel Meters
- Set-Top Boxes
- White Goods
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX6954 Reliability Data1/12/2023112K
Electronic Displays Comparison9/9/2002
Connecting Dual-Digit LED Modules3/12/2010
Extending MAX6954 and MAX6955 Keyscan Beyond 32 Keys3/25/2005
Quick-Start: Driving 16-Segment Displays with the MAX69546/25/2004
Quick-Start: Driving 14-Segment Displays with the MAX69546/25/2004
Quick-Start: Driving 7-Segment Displays with the MAX69546/25/2004
Adding Global LED Intensity Control to the MAX6954 and MAX6955 LED Drivers7/17/2002
LEDs Are Still Popular (and Improving) after All These Years2/25/2003
Using Analog Devices SPI-compatible Display Drivers with other SPI Peripherals2/10/2003
Charlieplexing - Reduced Pin-Count LED Display Multiplexing2/10/2003
Selecting Numeric and Alphanumeric Display Configurations for the MAX6954 and MAX6955 SPI and I2C LED Display Drivers7/16/2002
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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