SNVSCP2A March   2025  – August 2025 LP5815

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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 Timing Requirements
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Dimming
      2. 7.3.2 PWM Dimming
      3. 7.3.3 Sloper
      4. 7.3.4 Autonomous Animation Control
        1. 7.3.4.1 Animation Engine Unit
        2. 7.3.4.2 Animation Pattern Unit
        3. 7.3.4.3 Animation Control
      5. 7.3.5 Instant Blinking
      6. 7.3.6 Protections
        1. 7.3.6.1 UVLO
        2. 7.3.6.2 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Initialization Mode
      2. 7.4.2 Standby and Normal Mode
      3. 7.4.3 Instant Blinking Mode
      4. 7.4.4 Shutdown Mode
      5. 7.4.5 Thermal Shutdown Mode
    5. 7.5 Programming
      1. 7.5.1 I2C Data Tansactions
      2. 7.5.2 I2C Data Format
      3. 7.5.3 Command Description
    6. 7.6 Register Maps
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Parameters
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Program Procedure
        2. 8.2.3.2 Programming Example
      4. 8.2.4 Application Performance Plots
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.5 Instant Blinking

The LP5815 provides instant blinking via STAT control function for applications that require LED indication before controller is ready to send command. When VCC voltage is higher than VCC_UVLO and instant blinking function is not disabled (INSTABLINK_DIS = 0), the OUT0 waits 300ms blank time to start blinking after STAT being pulled high. The timing is shown in Figure 7-9.

During the 300ms blank time after STAT being pulled high:

  • If the instant blinking function is not disabled (INSTABLINK_DIS = 0 (default)), the LP5815 does not respond to the 5 dedicated software commands as described in Command Description and the OUT0 of the LP5815 starts running the blinking pattern as showed in Instant Blinking Pattern after the blank time.
  • If the instant blinking function is disabled by setting the INSTABLINK_DIS as 1 through the I2C interface, the LP5815 responds to the 5 dedicated software commands as described in Command Description except for the Shutdown_command that the LP5815 does not enter SHUTDOWN mode until the STAT is pulled low. The OUT0 doesn't run the blinking pattern after the blank time.

While the LP5815 staying in INSTANT BLINKING mode:

  • The OUT0 keeps running the blinking pattern if STAT is kept high (STAT = H) and instant blinking function is not disabled (INSTABLINK_DIS = 0).
  • The 5 dedicated software commands don't work as described in Command Description.
  • The OUT0 stops running the blinking pattern if STAT is pulled low (STAT = L) or instant blinking function is disabled (INSTABLINK_DIS = 1).


LP5815 Instant Blinking Timing

Figure 7-9 Instant Blinking Timing

Figure 7-10 shows the parameters of 1 cycle blinking pattern.

At the beginning, there is 500ms pause time before PWM starts ramping up. After the pause time, the PWM ramps up from 0 to 50% in 200ms, then keeps 50% for 1s. Next, PWM starts ramping down from 50% to 0 in 200ms. At last, the PWM keeps off for another 500ms pause time before the next cycle starts.

The maximum current setting for the instant blinking is 25.5mA with OUT0_DC = 0xFF, MAX_CURRENT = 0.


LP5815 Instant Blinking Pattern

Figure 7-10 Instant Blinking Pattern

Figure 7-11 shows a typical application circuit that provides the instant blinking function. The STAT pin is pulled up by an external resistor to the battery voltage or bus voltage of the charger. And there is a LED connected to OUT0.

When the battery voltage drops below the charging threshold, the charger starts to work and can turn off the STAT pulling down switch. Then the LED connected to OUT0 starts blinking as long as the VCC voltage of the LP5815 is higher than the VCC_UVLO threshold, which indicates the charging status. When the battery charging is completed, the charger can turn on the STAT pulling down switch to pull down the STAT to make the LP5815 exit the instant blinking state. Then the LED stops blinking to indicate the charging is completed.


LP5815 Instant Blinking Application Circuit

Figure 7-11 Instant Blinking Application Circuit