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MAX6956 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6956 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page General Description The 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 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 sink- ing 10mA and sourcing 4.5mA, or a Schmitt logic input with optional internal pullup. Seven ports feature config- urable transition detection logic, which generates an interrupt upon change of port logic level. The MAX6956 is controlled through an I 2C-compatible 2-wire serial interface, and uses four-level logic to allow 16 I 2C 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. For an SPI-interfaced version, refer to the MAX6957 data sheet. For a lower cost pin-compatible port expander without the constant-current LED drive capa- bility, refer to the MAX7300 data sheet. Applications Set-Top Boxes Bar Graph Displays Panel Meters Industrial Controllers White Goods System Monitoring Automotive Features o 400kbps I2C-Compatible Serial Interface o 2.5V to 5.5V Operation o -40°C to +125°C Temperature Range o 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 o 11µA (max) Shutdown Current o 16-Step Individually Programmable Current Control for Each LED o Logic Transition Detection for Seven I/O Ports 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander ________________________________________________________________ Maxim Integrated Products 1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 V+ AD1 SCL SDA P31 P30 P22 P29 P28 P27 P26 P25 P24 P23 P21 P20 P19 P18 P17 P16 P15 P14 P13 P12 AD0 GND GND ISET SSOP/DIP TOP VIEW MAX6956 Pin Configurations 19-2414; Rev 3; 3/09 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Typical Operating Circuit appears at end of data sheet. Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6956ANI -40 °C to +125°C 28 DIP MAX6956AAI -40 °C to +125°C 28 SSOP MAX6956AAX -40 °C to +125°C 36 SSOP MAX6956ATL -40 °C to +125°C 40 Thin QFN-EP* Pin Configurations continued at end of data sheet. * EP = Exposed pad. |
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