Features and Benefits
- 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
The MAX6957 compact, serial-interfaced LED display driver general-purpose I/O (GPIO) peripheral provides 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 constantcurrent 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.
- Bar Graph Displays
- Industrial Controllers
- Panel Meters
- Set-Top Boxes
- System Monitoring
- White Goods
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX6957 Reliability Data1/12/2023
UG-4021: MAX6956 Programming Guide3/22/2007
Electronic Displays Comparison9/9/2002
Driving LEDs with Push-Pull Port Expander Outputs9/22/2003
Driving LEDs with Constant Current Port Expander Outputs9/12/2003
LEDs Are Still Popular (and Improving) after All These Years2/25/2003
Using Analog Devices SPI-compatible Display Drivers with other SPI Peripherals2/10/2003
Experimenting with the MAX6956 and MAX6957 SPI and I²C GPIO and LED Display Drivers from a PC6/28/2002
MAX6957 Companion Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|MAX6957AAI+||Material Declaration||Reliability Data||28-SSOP-5.3_MM|
|MAX6957AAI+T||Material Declaration||Reliability Data||28-SSOP-5.3_MM|
|MAX6957AAX+||Material Declaration||Reliability Data||36-SSOP_W-7.62_MM|
|MAX6957AAX+T||Material Declaration||Reliability Data||36-SSOP_W-7.62_MM|
|MAX6957AAX/GG8||Material Declaration||Reliability Data||N/A|
|MAX6957ATL+||Material Declaration||Reliability Data||40-LFCSP-6X6X0.75|
|MAX6957ATL+T||Material Declaration||Reliability Data||40-LFCSP-6X6X0.75|
|Wafer Fabrication Data||MAX6957 Reliability Data|
Sample & Buy
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