MAX6957:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander

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
  • 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
MAX6957: Typical Operating Circuit
MAX6957: Typical Operating Circuit
Applications/Uses
  • Bar Graph Displays
  • Industrial Controllers
  • Panel Meters
  • Set-Top Boxes
  • System Monitoring
  • White Goods
DataSheet
titleDownload file
MAX6957 Data SheetMAX6957.pdf
Parametrics
Part NumberLCD or LEDDigits or Char.Output FormatDisplay TypeInterfaceVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX6957LED28-SegmentAny digit typeCommon AnodeSerial SPI 26Mbit2.55.5PDIP(N)/28
SSOP/28
SSOP/36
TQFN/40
$4.38 @1k
Quality and Environmental Data
Related Products
  • MAX7318:2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection
  • MAX7317:10-Port SPI-Interfaced I/O Expander with Overvoltage and Hot-Insertion Protection
  • MAX6958:2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
  • MAX6959:2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
  • MAX6955:2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
  • MAX6956:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
  • MAX6954:4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
  • MAX6952:4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
  • MAX6953:2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
  • MAX6950:Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
  • MAX6951:Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
  • MAX7221:Serially Interfaced, 8-Digit, LED Display Drivers
  • MAX7219:Serially Interfaced, 8-Digit, LED Display Drivers
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6957AAINo Longer AvailableMAX6957AAI+SSOP,;28 pin;81.6 mm²-40°C to +125°CSee data sheet
MAX6957AAI+ActiveSSOP,;28 pin;81.6 mm²-40°C to +125°CLead Free
MAX6957AAI+TActiveSSOP,;28 pin;81.6 mm²-40°C to +125°CLead Free
MAX6957AAI-TNo Longer AvailableMAX6957AAI+TSSOP;28 pin-40°C to +125°CSee data sheet
MAX6957AAXNo Longer AvailableMAX6957AAX+SSOP,;36 pin;163.4 mm²-40°C to +125°CNo
MAX6957AAX+ActiveSSOP,;36 pin;163.4 mm²-40°C to +125°CLead Free
MAX6957AAX+TActiveSSOP,;36 pin;163.4 mm²-40°C to +125°CLead Free
MAX6957AAX-TNo Longer AvailableMAX6957AAX+TSSOP;36 pin-40°C to +125°CSee data sheet
MAX6957AAX/GG8ActiveSSOP;-40°C to +125°CSee data sheet
MAX6957AAX/GH9No Longer AvailableMAX6957AAX+SSOP,;36 pin;163.4 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6957AAX/GH9-TNo Longer AvailableMAX6957AAX+SSOP,;36 pin;163.4 mm²-40°C to +125°CNo
MAX6957AGLNo Longer Available-40°C to +125°CSee data sheet
MAX6957AGL+No Longer Available-40°C to +125°CSee data sheet
MAX6957ANINo Longer AvailableMAX6957ANI+PDIP(N),;28 pin;289.5 mm²-40°C to +125°CNo
MAX6957ANI+No Longer AvailablePDIP(N),;28 pin;289.5 mm²-40°C to +125°CLead Free
MAX6957ATLNo Longer AvailableMAX6957ATL+TQFN,;40 pin;37.2 mm²-40°C to +125°CNo
MAX6957ATL+ActiveTQFN,;40 pin;37.2 mm²-40°C to +125°CLead Free
MAX6957ATL+TActiveTQFN,;40 pin;37.2 mm²-40°C to +125°CLead Free
MAX6957ATL-TNo Longer AvailableMAX6957ATL+TQFN;40 pin-40°C to +125°CSee data sheet
MAX6957.pdf MAX6957
MAX6957.pdf MAX6957
MAX6957.pdf MAX6957
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MAX6957.pdf MAX6957