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Notas de aplicación

• Descargar
  LTC3219 User &mdash AN111
  PDF, 86 Kb, Archivo publicado: jul 26, 2007
  The LTC3219 is a 250mA LED driver which illuminates 9 Universal LEDs (ULEDs). The ULEDs are considered universal because they may be individually turned on or off, set in general purpose output (GPO) mode, set to blink at a selected on-time and period, or gradate on and off at a selected gradation rate. This device also has an external enable (ENU) pin that may be used to blink, gradate, or turn on/off the LEDs without using the I2C bus. This may be useful if the microprocessor is in sleep or standby mode. If used properly, these features may save valuable memory space, programming time, and reduce I2C traffic.
  Extracto del documento

  Application Note 111
  July 2007
  LTC3219 User’s Guide
  by Marty Merchant
  INTRODUCTION
  The LTCВ®3219 is a 250mA LED driver which illuminates
  9 Universal LEDs (ULEDs). The ULEDs are considered
  universal because they may be individually turned on or
  off, set in general purpose output (GPO) mode, set to blink
  at a selected on-time and period, or gradate on and off at
  a selected gradation rate. This device also has an external
  enable (ENU) pin that may be used to blink, gradate, or turn
  on/off the LEDs without using the I2C bus. This may be
  useful if the microprocessor is in sleep or standby mode.
  If used properly, these features may save valuable memory
  space, programming time, and reduce I2C traffic.
  I2C Control
  The LTC3219 has 12 data registers, each with its own subaddress as shown in Table 2. The data is loaded into the
  registers when the device receives a Stop bit. This device
  is written using the standard I2C protocol. A 7-bit slave address and Write bit is followed by the 8-bit sub-address
  byte and an 8-bit data byte.
  The LTC3219 is a slave I2C device that only can receive
  data. …

Notas de Diseño

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  Tiny Universal LED Driver Can Gradate, Blink or Turn On Nine Individual LEDs with Minimal External Control &mdash DN422
  PDF, 97 Kb, Archivo publicado: jul 28, 2007
  Extracto del documento

  Tiny Universal LED Driver Can Gradate, Blink or Turn On Nine
  Individual LEDs with Minimal External Control – Design Note 422
  Marty Merchant
  Introduction
  LEDs are the lighting workhorse of cell phones, MP3
  players and diagnostic lights in telecom systems. Their
  uses are many, from utilitarian backlighting to eye-catching aesthetic effects such as slowly pulsing multicolor
  indicators. As device designers strive to differentiate
  their products on the shelf, the number and complexity of
  lighting effects grows. It would seem that each new effect
  requires significant additional hardware, and/or complex
  software, right? Actually, no, there is a way to apply these
  effects to a number of LEDs with only a single driver IC.
  The LTC В® 3219 9-output universal LED (ULED) driver
  can be programmed to individually gradate, blink or
  turn on nine individual LEDs using internal logic and
  circuitry to drive nine 6-bit DAC-controlled LED current
  sources. Because the gradation and blinking features
  are controlled internally, effects can be realized without
  adding ICs, extensively tying up the I2C bus or п¬Ѓlling
  valuable memory space with complex programming
  subroutines. Any feature on any 0mA to 28mA output can
  be conп¬Ѓgured to activate via the external enable (ENU) …

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