TLC5973 Datasheet, PDF (2/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet)

TLC5973
SBVS225B – MARCH 2013 – REVISED MAY 2014
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ..................................... 3
6.2 Handling Ratings....................................................... 3
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Switching Characteristics .......................................... 6
6.7 Typical Characteristics .............................................. 6
7 Parameter Measurement Information .................. 7
7.1 Pin-Equivalent Input and Output Schematic
Diagrams.................................................................... 7
7.2 Test Circuits .............................................................. 7
7.3 Timing Diagrams ....................................................... 8
8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 13
8.5 Programming........................................................... 19
8.6 Register Maps ......................................................... 21
9 Applications and Implementation ...................... 22
9.1 Application Information............................................ 22
9.2 Typical Applications ................................................ 22
10 Power Supply Recommendations ..................... 28
11 Layout................................................................... 28
11.1 Layout Guidelines ................................................. 28
11.2 Layout Example .................................................... 28
12 Device and Documentation Support ................. 29
12.1 Trademarks ........................................................... 29
12.2 Electrostatic Discharge Caution ............................ 29
12.3 Glossary ................................................................ 29
13 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
Changes from Revision A (May 2013) to Revision B
Page
• Changed format to meet latest data sheet standards; added Applications and Implementation, Power Supply
Recommendations, and Layout sections, moved existing sections ....................................................................................... 1
• Changed 8-bit pulse width modulation to 12-bit pulse width modulation in Description section ........................................... 1
• Changed t_H0 and t_H1 parameter units from µs to ns in Recommended Operating Conditions table ..................................... 4
• Changed Figure 8: deleted top SDO, changed bottom SDO to OUTn ................................................................................. 7
• Changed Figure 11: deleted extraneous breaks in traces, extraneous data call-outs, and t_H1 on GSLAT trace,
changed data transfer trace note to Internal to 1st Device and 1st Data to 47th Data in 48-Bit Shift Register LSB trace.... 9
• Changed functional block diagram: changed Upper 8 Bits to Upper 12 Bits on 48-Bit Shift Register block ....................... 11
• Added Grayscale (GS) Control, EasySet and Shunt Regulator, and No Limit Cascading sections .................................... 11
• Changed Connector Design title .......................................................................................................................................... 13
• Changed Figure 13: changed OUTn traces GSDATA = 4093 and GSDATA = 4094 ......................................................... 15
• Changed description of the Data ‘0’ and Data ‘1’ Write Sequence (Data Write Sequence) section ................................... 16
• Changed title of Controlling Devices Connected in Series section ...................................................................................... 19
• Changed Data 101 to Data 1010 in Figure 18 .................................................................................................................... 19
• Changed eight MSBs to 12 MSBs in third sentence of the Register and Data Latch Configuration section ....................... 21
• Changed Figure 21: corrected 3AAh bit set sequence ........................................................................................................ 21
• Changed Figure 26: changed number of LEDs in optional dashed box .............................................................................. 26
• Changed Table 7: changed all values in R_VCC column and first and last values in Resistor Wattage column .................... 27
Changes from Original (March 2013) to Revision A
Page
• Changed second paragraph of Grayscale (GS) Function (PWM Control) section............................................................... 13
• Changed t_CYCLE setting range in Data Transfer Rate (t_CYCLE) Measurement Sequence section .......................................... 16
• Updated Figure 18................................................................................................................................................................ 19
• Updated Figure 21 and Table 3............................................................................................................................................ 21
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