MAX6956 19-2414 Rev 4 6/10 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander General Description Features 2 400kbps I C-Compatible Serial Interface The MAX6956 compact, serial-interfaced LED display driver/I/O expander provide microprocessors with up to 2.5V to 5.5V Operation 28 ports. Each port is individually user configurable to -40C to +125C Temperature Range either a logic input, logic output, or common-anode 20 or 28 I/O Ports, Each Configurable as (CA) LED constant-current segment driver. Each port Constant-Current LED Driver configured as an LED segment driver behaves as a Push-Pull Logic Output digitally controlled constant-current sink, with 16 equal Schmitt Logic Input current steps from 1.5mA to 24mA. The LED drivers are Schmitt Logic Input with Internal Pullup suitable for both discrete LEDs and CA numeric and 11A (max) Shutdown Current alphanumeric LED digits. 16-Step Individually Programmable Current Each port configured as a general-purpose I/O (GPIO) Control for Each LED can be either a push-pull logic output capable of sink- ing 10mA and sourcing 4.5mA, or a Schmitt logic input Logic Transition Detection for Seven I/O Ports with optional internal pullup. Seven ports feature config- Ordering Information urable transition detection logic, which generates an interrupt upon change of port logic level. The MAX6956 PART TEMP RANGE PIN-PACKAGE 2 is controlled through an I C-compatible 2-wire serial 2 MAX6956ANI+ -40C to +125C 28 DIP interface, and uses four-level logic to allow 16 I C MAX6956AAI+ -40C to +125C 28 SSOP addresses from only 2 select pins. MAX6956AAX+ -40C to +125C 36 SSOP The MAX6956AAX and MAX6956ATL have 28 ports and are available in 36-pin SSOP and 40-pin thin QFN MAX6956ATL+ -40C to +125C 40 Thin QFN-EP* packages, respectively. The MAX6956AAI and MAX6956AAX/V -40C to +125C 36 SSOP MAX6956ANI have 20 ports and are available in 28-pin MAX6956AAX/V+T -40C to +125C 36 SSOP SSOP and 28-pin DIP packages, respectively. /V denotes an automotive qualified part. For an SPI-interfaced version, refer to the MAX6957 +Denotes a lead(Pb)-free/RoHS-compliant package. data sheet. For a lower cost pin-compatible port T = Tape and reel. expander without the constant-current LED drive capa- *EP = Exposed pad. bility, refer to the MAX7300 data sheet. Pin Configurations Applications TOP VIEW Set-Top Boxes Bar Graph Displays ISET 1 28 V+ Panel Meters Industrial Controllers GND 2 27 AD1 White Goods System Monitoring GND 3 26 SCL 25 AD0 4 SDA Automotive P12 5 24 P31 MAX6956 P13 6 23 P30 P14 7 22 P29 Typical Operating Circuit appears at end of data sheet. P15 8 21 P28 P16 9 20 P27 P17 10 19 P26 P18 11 18 P25 P19 12 17 P24 P20 13 16 P23 P21 14 15 P22 SSOP/DIP Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander ABSOLUTE MAXIMUM RATINGS Voltage (with Respect to GND) 36-Pin SSOP (derate 11.8mW/C above T = +70C)...941mW A V+.............................................................................-0.3V to +6V 40-Pin TQFN (derate 26.3mW/C above T = +70C) 2105mW A SCL, SDA, AD0, AD1................................................-0.3V to +6V Operating Temperature Range All Other Pins................................................-0.3V to (V+ + 0.3V) (T to T ) ...............................................-40C to +125C MIN MAX P4P31 Current ................................................................30mA Junction Temperature......................................................+150C GND Current .....................................................................800mA Storage Temperature Range .............................-65C to +150C Continuous Power Dissipation Soldering Temperature (reflow) 28-Pin PDIP (derate 14.3mW/C above T = +70C) 1143mW Lead(Pb)-free packages...............................................+260C A 28-Pin SSOP (derate 9.1mW/C above T = +70C)...727mW Packages containing lead(Pb)......................................+240C A 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. ELECTRICAL CHARACTERISTICS (Typical Operating Circuit, V+ = 2.5V to 5.5V, T = T to T , unless otherwise noted.) (Note 1) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ 2.5 5.5 V T = +25C 5.5 8 A All digital inputs at V+ Shutdown Supply Current I T = -40C to +85C 10 A SHDN A or GND T = T to T 11 A MIN MAX All ports programmed T = +25C 180 230 A as outputs high, no Operating Supply Current I A GPOH T = -40C to +85C 250 A load, all other inputs at V+ or GND T = T to T 270 A MIN MAX T = +25C 170 210 All ports programmed A as outputs low, no Operating Supply Current I T = -40C to +85C 230 A GPOL A load, all other inputs at V+ or GND T = T to T 240 A MIN MAX All p orts pr ogr amm ed T = +25C 110 135 A as LED outputs , all LED s Operating Supply Current I T = -40C to +85C 140 A LED A off, no load , a ll other i np uts at V+ or GN D T = T to T 145 A MIN MAX INPUTS AND OUTPUTS Logic-High Input Voltage 0.7 V V IH Port Inputs V+ Logic-Low Input Voltage 0.3 V V IL Port Inputs V+ GPIO inputs without pullup, Input Leakage Current I , I -100 1 +100 nA IH IL V = V+ to GND PORT V+ = 2.5V 12 19 30 GPIO Input Internal Pullup to V+ I A PU V+ = 5.5V 80 120 180 Hysteresis Voltage GPIO Inputs V 0.3 V I GPIO outputs, I = 2mA, T = -40C to V+ - SOURCE A +85C 0.7 Output High Voltage V V OH GPIO outputs, I = 1mA, T = T to V+ - SOURCE A MIN T (Note 2) 0.7 MAX Port Sink Current I V = 0.6V 2 10 18 mA OL PORT Output Short-Circuit Current I Port configured output low, shorted to V+ 2.75 11 20 mA OLSC 2 MAX6956