SBVS129A May   2009  – July 2018 TLC5952

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit (Multiple Daisy-Chained TLC5952s)
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Pin Equivalent Input and Output Schematic Diagrams
    2. 7.2 Test Circuits
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Maximum Constant-Sink-Current Value
      2. 8.3.2 Global Brightness Control (BC) Function: Sink-Current Control
      3. 8.3.3 Constant-Current Output On-Off Control
    4. 8.4 Device Functional Modes
      1. 8.4.1 LOD, LSD, and TEF Operation
      2. 8.4.2 Register and Data Latch Configuration
        1. 8.4.2.1 Output On-Off Data Latch
        2. 8.4.2.2 Control-Data Latch
        3. 8.4.2.3 Status Information Data (SID)
        4. 8.4.2.4 LED-Open Detection (LOD), LED-Short Detection (LSD), And Thermal Error Flag (TEF)
        5. 8.4.2.5 Thermal Shutdown (TSD)
        6. 8.4.2.6 Noise Reduction
  9. 9 Power Supply Recommendations
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.2.2 Control-Data Latch

The control data latch is 24 bits long and is used to adjust the LED current for each color group (OUTR0-OUTR7, OUTG0-OUTG7, and OUTB0-OUTB7). The LED current for each group can be adjusted between 0% and 100% of IOLCMAX in 128 steps (7-bit resolution). This data latch is also used to select the error detection type, LED open detection (LOD) or LED short detection (LSD), and the threshold voltage. When the MSB of the common shift register is set to 1, the lower 24 bits are written to the control data latch on the rising edge of LAT. Table 4 shows the control data latch bit assignment.

When the device is powered on, the data in the control data latch are not set to a default value. Therefore, the control data latch data should be written to the latch before the constant-current outputs are turned on.

Table 4. Data Bit Assignment

BITS DESCRIPTION
6–0 Global brightness control data for RED group (OUTR0-OUTR7, data = 00h to 7Fh)
13–7 Global brightness control data for GREEN group (OUTG0-OUTG7, data = 00h to 7Fh)
20–14 Global brightness control data for BLUE group (OUTB0-OUTB7, data = 00h to 7Fh)
23–21 Detection voltage and type select (data = 0h to 7h)
0 = LED open detection with 0.3 V (typ) threshold
1 = LED open detection with 0.6 V (typ) threshold
2 = LED open detection with 0.9 V (typ) threshold
3 = LED open detection with 1.2 V (typ) threshold
4 = LED short detection with VCC × 60% (typ) threshold
5 = LED short detection with VCC × 70% (typ) threshold
6 = LED short detection with VCC × 80% (typ) threshold
7 = LED short detection with VCC × 90% (typ) threshold

Figure 38 shows the operation to write data into the common shift register and control data latch.

TLC5952 ai_tim_data_wr_op_bvs129.gifFigure 38. Data Write Operation