SNVS820B APRIL   2013  – December 2016

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  Logic Interface Characteristics
    7. 6.7  Recommended External Clock Source Conditions
    8. 6.8  I2C Timing Requirements (SDA, SCL)
    9. 6.9  Typical Characteristics: Current Consumption
    10. 6.10 Typical Characteristics: LED Output
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  LED Drivers Operational Description
        1. 7.3.1.1 LED Driver Current Control
        2. 7.3.1.2 Controlling LED Driver Output PWM
      2. 7.3.2  Direct I2C Register PWM Control Example
      3. 7.3.3  Program Execution Engines
        1. 7.3.3.1 Program Execution Engine States
        2. 7.3.3.2 Program Execution Engine Operation Modes
          1. 7.3.3.2.1 Operation Modes
        3. 7.3.3.3 Program Execution Engine Program Counter (PC)
        4. 7.3.3.4 Program Execution Engine Programming Commands
          1. 7.3.3.4.1 Ramp/Wait
          2. 7.3.3.4.2 Set PWM
          3. 7.3.3.4.3 Go-to-Start
          4. 7.3.3.4.4 Branch
          5. 7.3.3.4.5 End
          6. 7.3.3.4.6 Trigger
        5. 7.3.3.5 Program Load and Execution Example
      4. 7.3.4  Power-Save Mode
      5. 7.3.5  External Clock
      6. 7.3.6  Thermal Shutdown
      7. 7.3.7  Logic Interface Operational Description
      8. 7.3.8  I/O Levels
      9. 7.3.9  ADDR_SEL0, ADDR_SEL1 Pins
      10. 7.3.10 CLK_32 Pin
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 SRAM Memory
      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
        8. 7.5.2.8 Register Read/Write Format
    6. 7.6 Register Maps
      1. 7.6.1  Enable Register (Enable) (Address = 00h) [reset = 00h]
      2. 7.6.2  Operation Mode Register (OP Mode) (address = 01h) [reset = 00h]
      3. 7.6.3  B LED Output PWM Control Register (B_PWM) (address = 02h) [reset = 00h]
      4. 7.6.4  G LED Output PWM Control Register (G_PWM) (address = 03h) [reset = 00h]
      5. 7.6.5  R LED Output PWM Control Register (R_PWM) (address = 04h) [reset = 00h]
      6. 7.6.6  B LED Output Current Control Register (B_CURRENT)(address = 05h) [reset = AFh]
      7. 7.6.7  G LED Output Current Control Register (G_CURRENT)(address = 06h) [reset = AFh]
      8. 7.6.8  R LED Output Current Control Register (R_CURRENT) (address = 07h) [reset = AFh]
      9. 7.6.9  Configuration Control Register (CONFIG) (address = 08h) [reset = 00h]
      10. 7.6.10 Engine 1 Program Counter Value Register (Engine 1 PC) (address = 09h) [reset = 00h]
      11. 7.6.11 Engine 2 Program Counter Value Register (Engine 2 PC) (address = 0Ah) [reset = 00h]
      12. 7.6.12 Engine 3 Program Counter Value Register (Engine 3 PC) (address = 0Ah) [reset = 00h]
      13. 7.6.13 STATUS/INTERRUPT Register (address = 0Ch) [reset = 00h]
      14. 7.6.14 RESET Register (address = 0Dh) [reset = 00h]
      15. 7.6.15 WLED Output PWM Control Register (W_PWM) (address = 0Eh) [reset = 00h]
      16. 7.6.16 W LED Output Current Control Register (W_CURRENT) (address = 0Fh) [reset = AFh]
      17. 7.6.17 LED Mapping Register (LED Map) (address = 70h) [reset = 39h]
      18. 7.6.18 Program Memory (address = 10h - 6Fh) [reset = 00h]
  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 Output Current Configuration
        2. 8.2.2.2 PWM Frequency Configuration
        3. 8.2.2.3 Clock Source Configuration
        4. 8.2.2.4 Power-Save Mode Configuration
        5. 8.2.2.5 Light Engine Configuration
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendation
  10. 10Layout
    1. 10.1 Layout Guidelines
    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 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LP5562 is designed for mobile applications with an input voltage VIN between 2.7 V to 5.5 V to support a 1S lithium-ion battery source. A microcontroller or other I2C host is required to initialize and configure the LP5562 after power-up. An internal of external 32-kHz clock is required. If multiple LP5562 devices are used to sequence multiple RGB LEDs, then the external 32-kHz clock input is required. The ADDRSEL0 and ADDRSEL1 pins can be used to allow unique sequencing of up to four LP5562 devices on the same I2C bus.

The four LED current drivers can be configured up to 25.5-mA LED current each and are tolerant up to 6-V LED supply voltage.

8.2 Typical Application

Figure 44 shows the typical application for LP5562 supporting one RGB LED and one White LED with the four LED current outputs.

LP5562 30197400.gif Figure 44. LP5562 Typical Application

8.2.1 Design Requirements

For typical LED-driver applications, use the parameters listed in Table 44.

Table 44. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Minimum input voltage 2.7 V
Maximum input voltage 5.5 V
EN/VCC logic level 1.8 V
R output current 24 mA
G output current 20 mA
B output current 22 mA
WLED output current 18 mA
PWM frequency 256 Hz
32-kHz clock source External
Light engines 1, 2 and 3 Blink on/off
Power-save mode Enabled

8.2.2 Detailed Design Procedure

Table 45. Recommended External Components

MODEL TYPE VENDOR VOLTAGE RATING SIZE INCH (MM)
1 µF for CIN
C1005X5R1A105K Ceramic X5R TDK 10 V 0402 (1005)
GRM155R61A105KE15D Ceramic X5R Murata 10 V 0402 (1005)
LEDs User Defined

8.2.2.1 Output Current Configuration

  • For 22-mA “B” output current the register address 0x05 is set to 0xDC. B_CURRENT[7:0] = (22 mA / 0.1) = 220 decimal.
  • For 22-mA “G” output current the register address 0x06 is set to 0xC8. G_CURRENT[7:0] = (20 mA / 0.1) = 200 decimal.
  • For 24-mA “R” output current the register address 0x07 is set to 0xF0. R_CURRENT[7:0] = (24 mA / 0.1) = 240 decimal.
  • For 18-mA “WLED” output current the register address 0x0F is set to 0xB4. W_CURRENT[7:0] = (18 mA / 0.1) = 180 decimal.

8.2.2.2 PWM Frequency Configuration

To set the PWM frequency to 256 Hz the PWM_HF bit must be written to '0'. It is located at register address 0x08 bit 6.

8.2.2.3 Clock Source Configuration

To set the clock source to external clock input the INT_CLK_EN and CLK_DET_EN bits are set to “00”. These are located at register address 0x08 bits 0 and 1.

8.2.2.4 Power-Save Mode Configuration

To enable the power save mode function the PWRSAVE_EN bit must be set to '1'. It is located at register address 0x08 bit 5.

8.2.2.5 Light Engine Configuration

Sample code for 100% to 0% duty blinking LED function is shown in Table 46.

Table 46. LED Function Sample Codes

ADDRESS VALUE COMMENTS
Engine 1 Section Start
0 40FF Loop1 set_pwm 255
1 4D00 wait 200
2 4000 set_pwm 0
3 6000 wait 500
4 A200 branch 4, loop1
5 D000 end, i
Engine 2 Section Start
10 40FF Loop2 set_pwm 255
11 4D00 wait 200
12 4000 set_pwm 0
13 6000 wait 500
14 A290 branch 5, loop2
15 D000 end, i
Engine 3 Section Start
20 40FF Loop3 set_pwm 255
21 4D00 wait 200
22 4000 set_pwm 0
23 6000 wait 500
24 A320 branch 6, loop3
25 D000 end, i

8.2.3 Application Curve

LP5562 appscurve_snvs820.gif
External Clock PS. Blink-Program
Figure 45. LED Driver Current Accuracy vs RGBW Current
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