VERSATILE LED DRIVERS PROVIDE 28 LED DRIVE OUTPUTS AND GENERAL-PURPOSE I/O OPERATING FROM 2.5V TO 5.5V SUPPLY
SUNNYVALE, CA-August 13, 2002-Maxim Integrated Products (Nasdaq: MXIM) introduces the MAX6956/MAX6957 static LED display drivers with GPIO. Available in 28-pin DIP, 28-pin SSOP, and 36-pin SSOP packages, the MAX6956/MAX6957 expand the I/O capabilities of microcontrollers and microprocessors to the real world. The MAX6956 uses a 2-wire, I2C™-compatible serial interface capable of operating up to 400kbps. The MAX6957 uses a 4-wire, SPI™-compatible serial interface capable of operating up to 26Mbps.
These devices can drive four 7-segment common-anode LED digits, or 28 segments of any other common-anode LED display, including starburst 14- and 16-segment alphanumeric displays and bar graphs.
The drive current of each segment can be individually controlled with 16 equal steps to a maximum of 24mA. The full-scale current to all LEDs can be reduced using a single external resistor.
Any of the 28 segment drivers can be independently configured as either a common-anode LED driver, or CMOS push-pull logic output, or Schmitt-trigger logic input with or without an internal pullup resistor.
Segments and GPIO ports may be addressed and updated individually or in random contiguous groups of eight. Transition detection allows level changes on up to seven ports to be flagged automatically through a hardware interrupt or register flag.
Both devices feature low-power shutdown current of 11µA maximum, and operate from a 2.5V to 5.5V supply. Automotive (-40°C to +125°C) temperature range is standard. These LED drivers save 1.1W of power when driving 28 LEDs at 24mA from a 3.3V supply, compared with a traditional 5V supply!
Prices start at $2.95 for the MAX6956 and $2.95 for the MAX6957 (1000-up, FOB USA).
I2C is a trademark of Philips Corp.
SPI is a trademark of Motorola, Inc.
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