SNVSCC9B November   2023  – December 2024 LP5812

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 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 Time-Cross-Multiplexing (TCM) Scheme
        1. 7.3.1.1 Direct drive mode
        2. 7.3.1.2 TCM Drive Mode
        3. 7.3.1.3 Mix drive mode
        4. 7.3.1.4 Ghosting Elimination
      2. 7.3.2 Analog Dimming
      3. 7.3.3 PWM Dimming
      4. 7.3.4 Autonomous Animation Engine Control
        1. 7.3.4.1 Animation Engine Pattern
        2. 7.3.4.2 Sloper
        3. 7.3.4.3 Animation Engine Unit (AEU)
        4. 7.3.4.4 Animation Pause Unit (APU)
      5. 7.3.5 Protections and Diagnostics
        1. 7.3.5.1 LED Open Detections
        2. 7.3.5.2 LED Short Detections
        3. 7.3.5.3 Thermal Shutdown
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
    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 Input Capacitor Selection
        2. 8.2.3.2 Program Procedure
        3. 8.2.3.3 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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YBH|9
  • DSD|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.1.2 TCM Drive Mode

The TCM drive mode is used to drive up to 12 LEDs (or 4 RGB LEDs) with TCM scheme, which is configured by setting led_mode = 1h/2h/3h/4h for 1/2/3/4 scans. After setting the scan count, 'scan_order_x' (x = 1, 2, 3, 4) bits need to be written for the scan orders of each output. The default order is from OUT0 to OUT3 in 4 scans mode.

The TCM drive mode can drive 1 to 12 LEDs with 1 to 4 scans or ¼ to 1 multiplexing ratio. The names LED_xy (x = A, B, C, D; y = 0, 1, 2) are used in the register map for the corresponding LED, which is connected to OUTx (x = 0, 1, 2, 3). The detail naming rule is showed in Table 7-1.

Table 7-1 LED Names in Register Maps for TCM Drive Mode
LED name in registers LED Cathode
OUT0 OUT1 OUT2 OUT3
LED Anode OUT0 (A) - LED_A0 LED_A1 LED_A2
OUT1 (B) LED_B2 - LED_B0 LED_B1
OUT2 (C) LED_C1 LED_C2 - LED_C0
OUT3 (D) LED_D0 LED_D1 LED_D2 -

The typical application circuits are demonstrated as Figure 7-4 (1 scan), Figure 7-5 (2 scans), Figure 7-6 (3 scans) and Figure 7-7 (4 scans).

Note: To avoid unexpected emitting, in RGB LEDs applications, Red LEDs are recommended to be placed in LED_x1 (x = A, B, C, D) positions.
LP5812 TCM Drive Mode, 1 Scan, (led_mode = 1h, scan_order_0 = 0h) Figure 7-4 TCM Drive Mode, 1 Scan, (led_mode = 1h, scan_order_0 = 0h)
LP5812 TCM Drive Mode, 2 Scans (led_mode = 2h, scan_order_0 = 0h, scan_order_1 = 1h) Figure 7-5 TCM Drive Mode, 2 Scans (led_mode = 2h, scan_order_0 = 0h, scan_order_1 = 1h)
LP5812 TCM Drive Mode, 3 Scans (led_mode = 3h, scan_order_0 = 0h, scan_order_1 = 1h, scan_order_2 = 2h) Figure 7-6 TCM Drive Mode, 3 Scans (led_mode = 3h, scan_order_0 = 0h, scan_order_1 = 1h, scan_order_2 = 2h)
LP5812 TCM Drive Mode, 4 Scans (led_mode = 4h scan_order_0 = 0h, scan_order_1 = 1h, scan_order_2 = 2h, scan_order_3 = 3h) Figure 7-7 TCM Drive Mode, 4 Scans (led_mode = 4h scan_order_0 = 0h, scan_order_1 = 1h, scan_order_2 = 2h, scan_order_3 = 3h)