MAX6957AAI+

Price range: $5.75 - $8.85

The MAX6957 compact, serial-interfaced LED displaydriver general-purpose I/O (GPIO) peripheral providesmicroprocessors with up to 28 ports. Each port is individuallyuser configurable to either a logic input, logicoutput, or common-anode (CA) LED constant-currentsegment driver. Each port configured as an LED segmentdriver behaves as a digitally controlled constantcurrentsink, with 16 equal current steps from 1.5mA to24mA. The LED drivers are suitable for both discreteLEDs and CA numeric and alphanumeric LED digits.Each port configured as a GPIO can be either a push-pulllogic output capable of sinking 10mA and sourcing4.5mA, or a Schmitt logic input with optional internalpullup. Seven ports feature configurable transitiondetection logic, which generates an interrupt uponchange of port logic level. The MAX6957 is controlledthrough an SPI-compatible 4-wire serial interface.The MAX6957AAX and MAX6957ATL have 28 ports andare available in 36-pin SSOP and 40-pin TQFN (6mm x6mm) packages, respectively. The MAX6957AAI andMAX6957ANI have 20 ports and are available in 28-pinSSOP and 28-pin DIP packages, respectively.For a 2-wire interfaced version, refer to the MAX6956data sheet.For a lower cost pin-compatible port expander withoutthe constant-current LED drive capability, refer to theMAX7301 data sheet.ApplicationsBar Graph DisplaysIndustrial ControllersPanel MetersSet-Top BoxesSystem MonitoringWhite Goods