SLVSFI5A October   2020  – December 2020 TLC6C5748-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Terminal Configurations 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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Terminal-Equivalent Input and Output Schematic Diagrams
    2. 7.2 Test Circuits
    3. 7.3 Timing Diagrams
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Output Current Calculation
      2. 8.3.2 Register and Data Latch Configuration
        1. 8.3.2.1 769-Bit Common Shift Register
        2. 8.3.2.2 Grayscale (GS) Data Latch
        3. 8.3.2.3 Control Data Latch
        4. 8.3.2.4 Dot Correction (DC) Data Latch
        5. 8.3.2.5 Maximum Current (MC) Data Latch
        6. 8.3.2.6 Global Brightness Control (BC) Data Latch
        7. 8.3.2.7 Function Control (FC) Data Latch
      3. 8.3.3 Status Information Data (SID)
      4. 8.3.4 LED Open Detection (LOD)
      5. 8.3.5 LED Short Detection (LSD)
      6. 8.3.6 Thermal Shutdown Faults (TSD)
      7. 8.3.7 Noise Reduction
    4. 8.4 Device Functional Modes
      1. 8.4.1 Maximum Current Control (MC) Function
      2. 8.4.2 Dot Correction (DC) Function
      3. 8.4.3 Global Brightness Control (BC) Function
      4. 8.4.4 Grayscale (GS) Function (PWM Control)
        1. 8.4.4.1 Conventional PWM Control
        2. 8.4.4.2 Enhanced Spectrum (ES) PWM Control
        3. 8.4.4.3 Auto Display Repeat Function
        4. 8.4.4.4 Display Timing Reset Function
        5. 8.4.4.5 Auto Data Refresh Function
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Daisy-Chain Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Step-by-Step Design Procedure
          2. 9.2.1.2.2 Maximum Current (MC) Data
          3. 9.2.1.2.3 Global Brightness Control (BC) Data
          4. 9.2.1.2.4 Dot Correction (DC) Data
          5. 9.2.1.2.5 Grayscale (GS) Data
          6. 9.2.1.2.6 Other Control Data
        3. 9.2.1.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4.4 Grayscale (GS) Function (PWM Control)

The TLC6C5748-Q1 can adjust the brightness of each output channel using a pulse width modulation (PWM) control scheme. The architecture of 16 bits per channel results in 65,536 brightness steps, from 0% up to 100% brightness.

The PWM operation for OUTn is controlled by a 16-bit grayscale (GS) counter. The GS counter increments on each GS reference clock (GSCLK) rising edge. The GS counter resets to 0000h when the LAT rising signal for a GS data write is input with the display timing reset mode enabled.

The TLC6C5748-Q1 has two types of PWM control: conventional PWM control and enhanced spectrum (ES) PWM control. The conventional PWM control can be selected when the ESPWM bit in the control data latch is 0. The ES PWM control is selected when the ESPWM bit is 1. The conventional PWM control should be selected for multiplexing a drive. The ES-PWM control should be selected for a static drive.

The on-time (tOUT_ON) of each output (OUTn) can be calculated by Equation 2.

Equation 2. tOUT_ON (ns) = tGSCLK (ns) × GSXn

where:

  • tGSCLK = one GS clock period,
  • GSXn = the programmed GS value for OUTXn (GSXn = 0d to 65535d),
  • X = R, G, or B for the red, green, or blue color group, and
  • n = 0 to 15.

Table 8-11 summarizes the GS data values versus the output on-time duty cycle. When the device powers up, all OUTXn are forced off, the GS counter initializes to 0000h, and the status remains the same until GS data are written. After that, each OUTXn on and off status can be controlled by GS data and GSCLK.

Table 8-11 Output Duty Cycle and On-Time versus GS Data
GS DATAON-TIME DUTY (%)GS DATAON-TIME DUTY (%)
DECIMALHEXDECIMALHEX
00032768800050.000
110.00232769800150.002
220.00332770800250.003
330.00532771800350.005
——————
81911FFF12.498409599FFF62.498
8192200012.50040960A00062.500
8193200112.50240961A00162.502
——————
163813FFD24.99649149BFFD74.995
163823FFE24.99749150BFFE74.997
163833FFF24.99849151BFFF74.998
16384400025.00049152C00075.000
16385400125.00249153C00175.002
16386400225.00349154C00275.003
16387400325.00549155C00375.005
——————
245755FFF37.49857343DFFF87.498
24576600037.50057344E00087.500
24577600137.50257345E00187.502
——————
327657FFD49.99565533FFFD99.995
327667FFE49.99765534FFFE99.997
327677FFF49.99865535FFFF99.998