MAX6966:10-Port Constant-Current LED Drivers and I/O Expanders with PWM Intensity Control

The MAX6966/MAX6967 serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V. Each port can be individually configured as either: A 20mA constant-current LED driver (static or pulsewidth modulated (PWM)). A 10mA constant-current LED driver (static or PWM). An open-drain logic output. An overvoltage-protected Schmitt logic input. Analog and switching LED intensity control is built in: Individual 8-bit PWM control per output. Individual 1-bit analog control (half/full) per output. Global 3-bit analog control applies to all LED outputs. PWM timing of the 10 port outputs may be optionally staggered, consecutively phased in 45° increments. This spreads the PWM load currents over time in eight steps, helping to even out the power-supply current and reduce the RMS current. The MAX6966/MAX6967 can be configured to awake from shutdown on receipt of a minimum 3ms pulse on the active-low CS input. This hardware-wakeup feature allows a power-management controller or similar ASIC to enable the MAX6966/MAX6967 with preconfigured LED intensity settings. Shutdown can be programmed to wait up to 4s, fade down the sink currents to zero for a period of 1/16s to 4s, and then shut down. A similar ramp-up from shutdown can be programmed for 1/16s to 4s. The MAX6966/MAX6967 support hot insertion. All port pins remain high impedance in power-down (V+ = 0V) with up to 8V asserted on them. The DOUT/OSC pin can be configured as either the serial interface data output or optional PWM clock input. The MAX6966 powers up defaulting as DOUT output. The MAX6967 defaults as OSC input. For a similar part without the constant-current controls, refer to the MAX7317 data sheet.

Key Features
  • High-Speed 26MHz SPI™-/QSPI™-/MICROWIRE™-Compatible Serial Interface
  • 2.25V to 3.6V Operation
  • I/O Ports Default to High-Z (LEDs Off) on Power-Up
  • I/O Port Inputs Are Overvoltage Protected to 7V
  • I/O Port Outputs Are 7V-Rated Open Drain
  • I/O Port Outputs Are 10mA or 20mA Constant-Current Static/PWM LED Drivers, or Open-Drain Logic Outputs
  • I/O Ports Support Hot Insertion
  • Individual 8-Bit PWM Intensity Control for Each LED
  • Any Output May Use or Not Use PWM Control
  • Exit Shutdown (Warm Start) with Simple Active-Low CS Pulse
  • Auto Ramp-Down into Shutdown
  • Auto Ramp-Up Out from Shutdown
  • 0.8µA (typ), 2µA (max) Shutdown Current
  • Tiny 3mm x 3mm, 0.8mm High Thin QFN Package
  • -40°C to +125°C Temperature Range
MAX6966, MAX6967: Block Diagram
MAX6966, MAX6967: Block Diagram
  • Cell Phones
  • Keypad Backlights
  • LCD Backlights
  • LED Status Indication
  • Portable Equipment
  • RGB LED Drivers
titleDownload file
MAX6966-MAX6967 Data SheetMAX6966-MAX6967.pdf
Part NumberLCD or LEDDigits or Char.Output FormatDisplay TypeInterfaceSegment BlinkingVSUPPLY
minmaxSee Notes
MAX6966LED10-SegmentAny digit typeCommon AnodeSerial SPI 26MbitNo2.253.6QSOP/16
$2.34 @1k

Part NumberInterfaceI/OOver Voltage Protection
Drive Current
Package/PinsOper. Temp.
minmaxSee Notes
MAX6966Serial SPI 26Mbit107202.253.6QSOP/16
-40 to +125$2.34 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX6964:17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection
  • MAX6965:9-Output LED Driver with Intensity Control and Hot-Insertion Protection
  • MAX7300:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander
  • MAX6956:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
  • MAX7301:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
  • MAX6957:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6966AEENo Longer AvailableMAX6966AEE+QSOP,;16 pin;30.9 mm²-40°C to +125°CNo
MAX6966AEE+ActiveQSOP,;16 pin;30.9 mm²-40°C to +125°CLead Free
MAX6966AEE+TActiveQSOP,;16 pin;30.9 mm²-40°C to +125°CLead Free
MAX6966AEE-TNo Longer AvailableMAX6966AEE+TQSOP;16 pin-40°C to +125°CSee data sheet
MAX6966ATENo Longer AvailableMAX6966ATE+TQFN,;16 pin;9.6 mm²-40°C to +125°CNo
MAX6966ATE+ActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX6966ATE+TActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX6966ATE-TNo Longer AvailableMAX6966ATE+TQFN;16 pin-40°C to +125°CSee data sheet
MAX6966-MAX6967.pdf MAX6966
MAX6966-MAX6967_cn.pdf MAX6966
Driving LEDs with Constant Current Port Expander Outputs MAX6966
LEDs Are Still Popular (and Improving) after All These Years MAX6966
Using Maxim SPI-compatible Display Drivers with other SPI Peripherals MAX7317
Electronic Displays Comparison MAX6966
MAX6966.pdf MAX6966
MAX6966-MAX6967_cn.pdf MAX6966