Features: ` 400kbps I2C-Compatible Serial Interface
` 2.5V to 5.5V Operation
` -40°C to +125°C Temperature Range
` 20 or 28 I/O Ports, Each Configurable as Constant-Current LED Driver Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
` 11A (max) Shutdown Current
` 16-Step Individually Programmable Current Control for Each LED
` Logic Transition Detection for Seven I/O PortsApplication·Set-Top Boxes
·Bar Graph Displays
·Panel Meters
·Industrial Controllers
·White Goods
·System Monitoring
·AutomotivePinout
SpecificationsVoltage (with Respect to GND)
V+.............................................................................-0.3V to +6V
SCL, SDA, AD0, AD1..................................................-0.3V to +6V
All Other Pins.................................................-0.3V to (V+ + 0.3V)
P4P31 Current ..............................................................±30mA
GND Current .....................................................................800mA
Continuous Power Dissipation
28-Pin PDIP (derate 20.8mW/°C above TA = +70°C)..1667mW
28-Pin SSOP (derate 9.5mW/°C above TA = +70°C).....762mW
36-Pin SSOP (derate 11.8mW/°C above TA = +70°C)...941mW
40-Pin QFN (derate 26.3mW/°C above TA = +70°C)...2105mW
Operating Temperature Range
(TMIN to TMAX) ...............................................-40°C to +125°C
Junction Temperature....................................................+150°C
Storage Temperature Range .........................-65°C to +150°C
Lead Temperature (soldering, 10s) ...............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability
DescriptionThe MAX6956 compact, serial-interfaced LED display driver/I/O expander provide microprocessors with up to 28 ports. Each port is individually user configurable to either a logic input, logic output, or common-anode (CA) LED constant-current segment driver. Each port configured as an LED segment driver behaves as a digitally controlled constant-current sink, with 16 equal current steps from 1.5mA to 24mA. The LED drivers MAX6956 are suitable for both discrete LEDs and CA numeric and alphanumeric LED digits.
Each port configured as a general-purpose I/O (GPIO) can be either a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup. Seven ports feature configurable transition detection logic, which generates an interrupt upon change of port logic level. The MAX6956 is controlled through an I2C™-compatible 2-wire serial interface, and uses four-level logic to allow 16 I2C addresses from only 2 select pins.
The MAX6956AAX and MAX6956ATL have 28 ports and are available in 36-pin SSOP and 40-pin thin QFN packages, respectively. The MAX6956AAI and MAX6956ANI have 20 ports and are available in 28-pin SSOP and 28-pin DIP packages, respectively.
MAX6956 Data Sheet
