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Data Sheet

FULL DATA SHEET (PDF, 536kB) Download   E-Mail

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 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.

Key Features		Applications/Uses
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		Automotive Bar Graph Displays Industrial Controllers Panel Meters Set-Top Boxes System Monitoring White Goods

Diagram

Typical Operating Circuit

Application Notes

Application Note 828: LED Manufacturers' Web Sites - MAX6957 Application Note 1141: Adding Global Intensity Control to the MAX6956 and MAX6957 Static LED Drivers - MAX6957 Application Note 1142: Experimenting with the MAX6956 and MAX6957 SPI and I²C GPIO and LED Display Drivers from a PC - MAX6957 Application Note 1193: Electronic Displays Comparison - MAX6957 Application Note 1879: Using Maxim SPI-compatible Display Drivers with other SPI Peripherals - MAX6957 Application Note 1883: LEDs Are Still Popular (and Improving) after All These Years - MAX6957 Application Note 2197: Driving LEDs with Constant Current Port Expander Outputs - MAX6957 Application Note 4021: MAX6956 Programming Guide - MAX6957

Evaluation Kits

none

Reliability Reports

Show FIT data for: MAX6957 Reliability Report: MAX6957Axx.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-16 of 16
MAX6957	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6957AGL+				-40°C to +125°C	See data sheet
MAX6957AGL				-40°C to +125°C	See data sheet
MAX6957ANI+			PDIP;28 pin;290 mm² Dwg: 21-0043D (PDF) Use pkgcode/variation: N28+2*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957ANI			PDIP;28 pin;290 mm² Dwg: 21-0043D (PDF) Use pkgcode/variation: N28-2*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957AAI			SSOP;28 pin;82 mm² Dwg: 21-0056C (PDF) Use pkgcode/variation: A28-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957AAI+T			SSOP;28 pin;82 mm² Dwg: 21-0056C (PDF) Use pkgcode/variation: A28+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957AAI+			SSOP;28 pin;82 mm² Dwg: 21-0056C (PDF) Use pkgcode/variation: A28+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957AAI-T			SSOP;28 pin;82 mm² Dwg: 21-0056C (PDF) Use pkgcode/variation: A28-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957AAX-T			SSOP;36 pin;163 mm² Dwg: 21-0040E (PDF) Use pkgcode/variation: A36-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957AAX+			SSOP;36 pin;163 mm² Dwg: 21-0040E (PDF) Use pkgcode/variation: A36+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957AAX+T			SSOP;36 pin;163 mm² Dwg: 21-0040E (PDF) Use pkgcode/variation: A36+4*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957AAX			SSOP;36 pin;163 mm² Dwg: 21-0040E (PDF) Use pkgcode/variation: A36-4*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957ATL-T			THIN QFN;40 pin;37 mm² Dwg: 21-0141I (PDF) Use pkgcode/variation: T4066-5*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957ATL			THIN QFN;40 pin;37 mm² Dwg: 21-0141I (PDF) Use pkgcode/variation: T4066-5*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX6957ATL+			THIN QFN;40 pin;37 mm² Dwg: 21-0141I (PDF) Use pkgcode/variation: T4066+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6957ATL+T			THIN QFN;40 pin;37 mm² Dwg: 21-0141I (PDF) Use pkgcode/variation: T4066+5*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

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