24-Bit UFm 5 MHz I²C-Bus 100 MA 40 V LED Driver

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  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

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Product Details

Block Diagram

24-Bit UFm 5 MHz I2C-Bus 100 MA 40 V LED Driver

PCU9656 Block Diagram


Key Features

  • 24 LED drivers. Each output programmable at:
    • Off
    • On
    • Programmable LED brightness
    • Programmable group dimming/blinking mixed with individual LED brightness
  • 5 MHz Ultra Fast-mode unidirectional I²C-bus interface
  • 256-step (8-bit) linear programmable brightness per LEDn output varying from fully off (default) to maximum brightness using a 97 kHz PWM signal
  • 256-step group brightness control allows general dimming (using a 190 Hz PWM signal) from fully off to maximum brightness (default)
  • 256-step group blinking with frequency programmable from 24 Hz to 10.73s and duty cycle from 0 % to 99.6 %
  • 24 open-drain outputs can sink between 0 mA to 100 mA and are tolerant to a maximum off-state voltage of 40 V. No input function
  • Output state change programmable on the Acknowledge (bit 9, this bit is always set to 1 by controller) or the STOP Command to update outputs byte-by-byte or all at the same time (default to ‘Change on STOP’)
  • Active LOW Output Enable (OE) input pin allows for hardware blinking and dimming of the LEDs
  • Six hardware address pins allow 64 PCU9656 devices to be connected to the same UFm I²C-bus and to be individually programmed
  • Four software programmable UFm I²C-bus addresses (one LED Group Call address and three LED Sub Call addresses) allow groups of devices to be addressed at the same time in any combination (for example, one register used for ‘All Call’ so that all the PCU9656s on the I²C-bus can be addressed at the same time and the second register used for three different addresses so that 1⁄3 of all devices on the bus can be addressed at the same time in a group). Software enables and disables for I²C-bus address
  • A Chase Byte allows execution of predefined ON/OFF pattern for the 24 LEDn outputs
  • Software Reset feature (SWRST Call) allows the device to be reset through the UFm I²C-bus
  • 25 MHz internal oscillator requires no external components
  • Internal power-on reset
  • Noise filter on USDA/USCL inputs
  • Glitch-free LEDn outputs on power-up
  • Supports hot insertion
  • Low standby current
  • Operating power supply voltage (VDD) range of 2.3 V to 5.5 V
  • 5.5 V tolerant inputs on non-LED pins
  • -40 °C to +85 °C operation
  • ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
  • Package offered: LQFP48

Part numbers include: PCU9656B.


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