SNVS458D June   2007  – October 2016 LP55281

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 SPI Timing Requirements
    7. 6.7 I2C Timing Requirements
    8. 6.8 Boost Converter Typical Characteristics
    9. 6.9 RGB Driver Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Magnetic Boost DC-DC Converter
        1. 7.3.1.1 Boost Standby Mode
        2. 7.3.1.2 Boost Output Voltage Control
        3. 7.3.1.3 Boost Frequency Control
      2. 7.3.2 Functionality of RGB LED Outputs (R1-4, G1-4, B1-4)
        1. 7.3.2.1 PWM Control Timing
      3. 7.3.3 Audio Synchronization
        1. 7.3.3.1 Control of Audio Synchronization
        2. 7.3.3.2 ALED Driver
          1. 7.3.3.2.1 Adjustment of ALED Driver
      4. 7.3.4 LED Test Interface
        1. 7.3.4.1 LED Test Procedure
        2. 7.3.4.2 LED Test Time Estimation
      5. 7.3.5 7-V Shielding
    4. 7.4 Device Functional Modes
      1. 7.4.1 Modes Of Operation
    5. 7.5 Programming
      1. 7.5.1 SPI Interface
      2. 7.5.2 I2C Compatible Serial Bus Interface
        1. 7.5.2.1 Interface Bus Overview
        2. 7.5.2.2 Data Transactions
        3. 7.5.2.3 Acknowledge Cycle
        4. 7.5.2.4 Acknowledge After Every Byte Rule
        5. 7.5.2.5 Addressing Transfer Formats
        6. 7.5.2.6 Control Register Write Cycle
        7. 7.5.2.7 Control Register Read Cycle
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Recommended External Components
          1. 8.2.2.1.1 Output Capacitor, COUT
          2. 8.2.2.1.2 List Of Recommended External Components
          3. 8.2.2.1.3 Input Capacitor, CIN
          4. 8.2.2.1.4 Output Diode, D1
          5. 8.2.2.1.5 Inductor, L
      3. 8.2.3 Application Curves
    3. 8.3 Initialization Set Up Example
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Boost Output Capacitor Placement
      2. 10.1.2 Schottky Diode Placement
      3. 10.1.3 Inductor Placement
      4. 10.1.4 Boost Input Capacitor Placement
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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5 Pin Configuration and Functions

YPG and YZR Packages
36-Pin DSBGA
Top View
LP55281 pinconnect_top.gif
YPG and YZR Packages
36-Pin DSBGA
Bottom View
LP55281 pinconnect-bot.gif

Pin Functions

PIN TYPE DESCRIPTION
NUMBER NAME
1A VDD2 Power Supply voltage
1B VDDA Power Internal LDO output
1C VREF Output Reference voltage
1D GNDA Ground Ground for analog circuitry
1E B4 Output Blue LED 4 output
1F GND Ground Ground
2A B2 Output Blue LED 2 output
2B IF_SEL Logic Input Interface (SPI or I2C compatible) selection (IF_SEL = 1 for SPI)
2C IRT Input Oscillator frequency resistor
2D ASE1 Input Audio synchronization input 1
2E G4 Output Green LED 4 output
2F ALED Output Audio Synchronized LED oautput
3A G2 Output Green LED 2 output
3B SCK/SCL Logic Input Clock (SPI/I2C)
3C VDDIO Power Supply voltage for input/output buffers and drivers
3D VDD1 Power Supply voltage
3E R4 Output Red LED 4 output
3F NRST Input Asynchronous reset, active low
4A R2 Output Red LED 2 output
4B SO Logic Output Serial data out (SPI)
4C SI/A0 Logic Input Serial input (SPI), address select (I2C)
4D ASE2 Input Audio synchronization input 2
4E GND Ground Ground
4F GND_RGB2 Ground Ground for RGB3-4 currents
5A GND_RGB1 Ground Ground for RGB1-2 currents
5B IRGB Input Bias current set resistor for RGB drivers
5C SS/SDA Logic Input/Output Slave select (SPI), Serial data in/out (I2C)
5D G3 Output Green LED 3 output
5E R3 Output Red LED 3 output
5F GND_SW Ground Power switch ground
6A B1 Output Blue LED 1 output
6B G1 Output Green LED 1 output
6C R1 Output Red LED 1 output
6D B3 Output Blue LED 3 output
6E FB Input Boost converter feedback
6F SW Output Boost converter power switch