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MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
2-Wire Interfaced, 2.7V to 5.5V LED Display Drivers with GPIO and Key Scan
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Key Features
Applications/Uses
Parametric specs for Display Drivers
| LCD or LED | LED |
| Display Type | Common Cathode |
| Interface | Serial 2-Wire 400kbit |
| Digits or Char. | 16-Digit 7-Segment 8-Digit 14-Segment 8-Digit 16-Segment |
| Output Format | 14 segments 16 segments 7 segments |
| Fonts | 104 char ASCII Hexadecimal |
| Segment Blinking | Yes |
| VSUPPLY (V) (min) | 2.7 |
| VSUPPLY (V) (max) | 5.5 |
| Package/Pins | SSOP/36 TQFN/40 |
| Budgetary Price (See Notes) | 10.15 |
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Parameters
Parametric specs for Display Drivers
| LCD or LED | LED |
| Display Type | Common Cathode |
| Interface | Serial 2-Wire 400kbit |
| Digits or Char. | 16-Digit 7-Segment 8-Digit 14-Segment 8-Digit 16-Segment |
| Output Format | 14 segments 16 segments 7 segments |
| Fonts | 104 char ASCII Hexadecimal |
| Segment Blinking | Yes |
| VSUPPLY (V) (min) | 2.7 |
| VSUPPLY (V) (max) | 5.5 |
| Package/Pins | SSOP/36 TQFN/40 |
| Budgetary Price (See Notes) | 10.15 |
Key Features
- Simplifies Driving 5 x 7 Matrix LED Displays
- Drives Common-Cathode Monocolor and Bicolor LED Displays
- Drives Up to 16 Digits 7-Segment, 8 Digits 14-Segment, 8 Digits 16-Segment, 128 Discrete LEDs, or a Combination of Digit Types
- 2.7V to 5.5V Operation
- Standard 2-Wire Interface Supports a Variety of Microprocessor Architectures
- 400kbps 2-Wire I2C-Compatible Interface
- Integrated Flexibility Supports Different Application Requirements
- Built-In ASCII 104-Character Font for 14-Segment and 16-Segment Digits and Hexadecimal Font for 7-Segment Digits
- 16-Step Digit-by-Digit Digital Brightness Control
- Display Blanked on Power-Up
- Automatic Blinking Control for Each Segment
- 10µA (typ) Low-Power Shutdown (Data Retained)
- 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
- Slew-Rate-Limited Segment Drivers for Lower EMI
- 36-Pin SSOP and 40-Pin DIP and TQFN Packages
- Automotive Temperature Range Standard Covers Usage in Harsh Environments
Applications/Uses
- Audio/Video Equipment
- Bar Graph Displays
- Panel Meters
- Set-Top Boxes
- White Goods
Description
The MAX6955 is a compact display driver that interfaces microprocessors to a mix of 7-segment, 14-segment, and 16-segment LED displays through an I2C-compatible 2-wire serial interface. The MAX6955 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 general-purpose I/O (GPIO) lines, some or all of which can be configured as a key-switch reader. The key-switch reader 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 MAX6955 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 an SPI-compatible version, refer to the MAX6954 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.
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 MAX6955 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 an SPI-compatible version, refer to the MAX6954 data sheet. An evaluation kit (EV kit) for the MAX6955 is available.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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