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MAX6946 - Constant-Current LED Drivers and I/O Expanders

Description

The MAX6946/MAX6947 I2C

-/SMBus TM-compatible, serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V.

Features

  • 400kb, 6V-Tolerant Serial Interface.
  • 2.25V to 3.6V Operation.
  • I/O Ports Default to High Impedance (LEDs Off) on Power-Up.
  • I/O Port Inputs Are Overvoltage Protected to 7V.
  • I/O Port Outputs Are 7V-Rated Open-Drain, 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.
  • RST Input Clears Serial Interface and Can Exi.

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Datasheet preview – MAX6946

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Full PDF Text Transcription

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19-0598; Rev 0; 7/06 10-Port, Constant-Current LED Drivers and I/O Expanders with PWM Intensity Control General Description The MAX6946/MAX6947 I2C*-/SMBus TM-compatible, serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V. Each port can be configured as a 2.5mA to 20mA constant-current LED driver (static or PWM), a 1.25mA to 10mA constant-current LED driver (static or PWM), an open-drain logic output, or an overvoltage-protected Schmitt logic input. Analog and switching LED intensity control includes indiwww.DataSheet4U.com vidual 8-bit PWM control per output, individual 1-bit analog current control (half/full scale) per output, and a global 3-bit DAC current control that applies to all LED outputs.
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