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MAX6957ANI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX6957ANI Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 23 page  Typical operating Circuit appears at end of data sheet. QSPI is a trademark of Motorola, Inc. MICROWIRE is a registered trademark of National Semiconductor Corp. General Description The MAX6957 compact, serial-interfaced LED display driver general-purpose I/O (GPIO) peripheral provides microprocessors with up to 28 ports. Each port is indi- vidually user configurable to either a logic input, logic output, or common-anode (CA) LED constant-current segment driver. Each port configured as an LED seg- ment 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 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 MAX6957 is controlled through an SPI-compatible 4-wire serial interface. The MAX6957AAX and MAX6957ATL have 28 ports and are available in 36-pin SSOP and 40-pin TQFN (6mm x 6mm) packages, respectively. The MAX6957AAI and MAX6957ANI have 20 ports and are available in 28-pin SSOP and 28-pin DIP packages, respectively. For a 2-wire interfaced version, refer to the MAX6956 data sheet. For a lower cost pin-compatible port expander without the constant-current LED drive capability, refer to the MAX7301 data sheet. Applications ● Set-Top Boxes ● Panel Meters ● White Goods ● Bar Graph Displays ● Industrial Controllers ● System Monitoring Features ● High-Speed 26MHz SPI-/QSPI™-/MICROWIRE®- 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 ● 11µA (max) Shutdown Current ● 16-Step Individually Programmable Current Control for Each LED ● Logic Transition Detection for Seven I/O Ports Pin Configurations continued at end of data sheet. *Exposed pad. PART TEMP RANGE PIN- PACKAGE MAX6957ANI -40°C to +125°C 28 DIP MAX6957AAI -40°C to +125°C 28 SSOP MAX6957AAX -40°C to +125°C 36 SSOP MAX6957ATL -40°C to +125°C 40 TQFN-EP* 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+ CS SCLK DIN P31 P30 P22 P29 P28 P27 P26 P25 P24 P23 P21 P20 P19 P18 P17 P16 P15 P14 P13 P12 DOUT GND GND ISET SSOP/DIP TOP VIEW MAX6957 MAX6957 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander 19-2429; Rev 5; 7/14 Pin Configurations Ordering Information |
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