EVALUATION KIT AVAILABLE MAX6956 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander General Description Features 2 The MAX6956 compact, serial-interfaced LED display 400kbps I C-Compatible Serial Interface driver/I/O expander provide microprocessors with up to 28 2.5V to 5.5V Operation ports. Each port is individually user configurable to either -40C to +125C Temperature Range a logic input, logic output, or common-anode (CA) LED 20 or 28 I/O Ports, Each Configurable as constant-current segment driver. Each port configured as Constant-Current LED Driver an LED segment driver behaves as a digitally controlled Push-Pull Logic Output constant-current sink, with 16 equal current steps from Schmitt Logic Input 1.5mA to 24mA. The LED drivers are suitable for both dis- crete LEDs and CA numeric and alphanumeric LED digits. Schmitt Logic Input with Internal Pullup Each port configured as a general-purpose I/O (GPIO) 11A (max) Shutdown Current can be either a push-pull logic output capable of sinking 16-Step Individually Programmable Current 10mA and sourcing 4.5mA, or a Schmitt logic input with Control for Each LED optional internal pullup. Seven ports feature configurable Logic Transition Detection for Seven I/O Ports transition detection logic, which generates an interrupt upon change of port logic level. The MAX6956 is con- Ordering Information 2 trolled through an I C-compatible 2-wire serial interface, PART TEMP RANGE PIN-PACKAGE 2 and uses four-level logic to allow 16 I C addresses from MAX6956ANI+ -40C to +125C 28 DIP only 2 select pins. MAX6956AAI+ -40C to +125C 28 SSOP The MAX6956AAX and MAX6956ATL have 28 ports and MAX6956AAX+ -40C to +125C 36 SSOP are available in 36-pin SSOP and 40-pin thin QFN pack- MAX6956ATL+ -40C to +125C 40 Thin QFN-EP* ages, respectively. The MAX6956AAI and MAX6956ANI MAX6956AAX/V -40C to +125C 36 SSOP have 20 ports and are available in 28-pin SSOP and MAX6956AAX/V+T -40C to +125C 36 SSOP 28-pin DIP packages, respectively. /V denotes an automotive qualified part. For an SPI-interfaced version, refer to the MAX6957 data +Denotes a lead(Pb)-free/RoHS-compliant package. sheet. For a lower cost pin-compatible port expander T = Tape and reel. without the constant-current LED drive capability, refer to *EP = Exposed pad. 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 Automotive AD0 4 25 SDA P12 5 24 P31 MAX6956 P13 6 23 P30 P14 7 22 P29 21 P15 8 P28 Typical Operating Circuit appears at end of data sheet. 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. 19-2414 Rev 5 2/21MAX6956 2-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 T = -40C to +85C 250 A GPOH A load, all other inputs at 270 V+ or GND T = T to T A MIN MAX All ports programmed T = +25C 170 210 A as outputs low, no load, Operating Supply Current I T = -40C to +85C 230 A GPOL A all other inputs at V+ T = T to T 240 or GND A MIN MAX All ports programmed T = +25C 110 135 A as LED outputs, all Operating Supply Current I LEDs off, no load, all T = -40C to +85C 140 A LED A other inputs at V+ or 145 T = T to T GND A MIN MAX INPUTS AND OUTPUTS Logic-High Input Voltage 0.7 x V V IH Port Inputs V+ Logic-Low Input Voltage 0.3 x 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 A GPIO Input Internal Pullup to V+ I PU V+ = 5.5V 80 120 180 Hysteresis Voltage GPIO Inputs V 0.3 V I GPIO outputs, I = 2mA, T = -40C V+ - SOURCE A to +85C 0.7 Output High Voltage V OH V GPIO outputs, I = 1mA, T = T V+ - SOURCE A MIN to 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 Maxim Integrated 2 www.maximintegrated.com