2-Wire Interfaced, 2.7V to 5.5V LED Display Drivers with GPIO and Key Scan
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.
title | Download file |
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MAX6955 Data Sheet | MAX6955.pdf |
Part Number | LCD or LED | Digits or Char. | Output Format | Display Type | Interface | Fonts | Segment Blinking | VSUPPLY (V) | VSUPPLY (V) | Package/Pins | Budgetary Price |
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min | max | See Notes | |||||||||
MAX6955 | LED | 8-Digit 16-Segment 8-Digit 14-Segment 16-Digit 7-Segment | 7 segments 14 segments 16 segments | Common Cathode | Serial 2-Wire 400kbit | 104 char ASCII Hexadecimal | Yes | 2.7 | 5.5 | SSOP/36 TQFN/40 | $9.67 @1k |
Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
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MAX6955AAX | No Longer Available | MAX6955AAX+ | SSOP,;36 pin;163.4 mm² | -40°C to +125°C | No |
MAX6955AAX+ | Active | SSOP,;36 pin;163.4 mm² | -40°C to +125°C | Lead Free | |
MAX6955AAX+T | Active | SSOP,;36 pin;163.4 mm² | -40°C to +125°C | Lead Free | |
MAX6955AAX-T | No Longer Available | MAX6955AAX+T | SSOP;36 pin | -40°C to +125°C | See data sheet |
MAX6955ATL | No Longer Available | MAX6955ATL+ | QFN; | -40°C to +125°C | See data sheet |
MAX6955ATL+ | Active | TQFN,;40 pin;37.2 mm² | -40°C to +125°C | Lead Free | |
MAX6955ATL+T | Active | TQFN,;40 pin;37.2 mm² | -40°C to +125°C | Lead Free | |
MAX6955ATL-T | No Longer Available | MAX6955ATL+T | QFN; | -40°C to +125°C | See data sheet |