Datasheet Linear Technology LTC3220 — Datenblatt

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LTC3220-1

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  LTC3220/LTC3220-1 User’s Guide &mdash AN115
  PDF, 224 Kb, Datei veröffentlicht: Feb 28, 2008
  This application note illustrates how to program and use the unique features of the LTC3220/LTC3220-1 Universal LED (ULED) Driver. These features include individually controlling, gradually turning on and off, or blinking up to 18 LEDs. This device may also be used to provide digital signal(s) to other devices while in shutdown using a strong pull-down general purpose output (GPO) and an external power source. Current limited GPO mode may also be used to control other devices using the charge pump output (CPO) of the device or an external supply. A programmable shutdown feature allows the device to go into and out of shutdown returning to its pre-shutdown state. These features give the user vast flexibility and control of LEDs and other devices while saving memory space, programming time, I2C traffic, and even battery power.
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  Application Note 115
  February 2008
  LTC3220/LTC3220-1 User’s Guide
  by Marty Merchant INTRODUCTION power source. Current limited GPO mode may also be used
  to control other devices using the charge pump output
  (CPO) of the device or an external supply. A programmable
  shutdown feature allows the device to go into and out
  of shutdown returning to its pre-shutdown state. These
  features give the user vast flexibility and control of LEDs
  and other devices while saving memory space, programming time, I2C traffic, and even battery power. This application note illustrates how to program and use
  the unique features of the LTC3220/LTC3220-1 Universal
  LED (ULED) Driver. These features include individually
  controlling, gradually turning on and off, or blinking up to
  18 LEDs. This device may also be used to provide digital
  signal(s) to other devices while in shutdown using a strong
  pull-down general purpose output (GPO) and an external L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
  All other trademarks are the property of their respective owners. Table 1. Features of LTC3220
  FEATURE BENEFITS 18 Separate Outputs 18 Individually Controlled 20mA Current Sources with 64-Step Linear Dimming Control Blink Mode Blinks One of Four Blinking Patterns Gradation Gradually Turns On and Off LEDs GPO Mode (Strong) I2C Controlled Open Drain Drivers Operates in Shutdown, Low Q Current GPO Mode (Current Limited) I2C Controlled Open Drain Drivers with Adjustable Current Limit External Reset Resets All Internal Registers and Forces Part into Shutdown Programmable Shutdown I2C Controlled Shutdown Data Registers Retain Data and Outputs Return to Previous State when Shutdown Terminates Auto Switching Charge Pump Automatically Switches to 1x, 1.5x, or 2x Modes for Better Efficiency Forced Charge Pump Mode May Be Programmed to Remain in 1x, 1.5x, or 2x Mode C2
  2.2ОјF C3
  2.2ОјF C1P C1M C2P C2M
  VIN
  C1
  2.2ОјF VIN DVCC DVCC CPO …

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• Power Management > Inductorless (Charge Pump) DC/DC Converters > Inductorless (Charge Pump) LED Drivers