Datasheet TLC5940 (Texas Instruments) - 4

TLC5940
SLVS515D – DECEMBER 2004 – REVISED NOVEMBER 2015
www.ti.com Pin Functions PIN TYPE DESCRIPTION NAME DIP NO. PWP NO. RHB NO.
Blank all outputs. When BLANK = H, all OUTn outputs are forced OFF. BLANK 23 2 31 I GS counter is also reset. When BLANK = L, OUTn are controlled by grayscale PWM control. Switch DC data input. When DCPRG = L, DC is connected to EEPROM. When DCPRG = H, DC is connected to the DC register. DCPRG 19 26 25 I DCPRG also controls EEPROM writing, when VPRG = V(PRG). EEPROM data = 3 Fh (default) GND 22 1 30 G Ground GSCLK 18 25 24 I Reference clock for grayscale PWM control IREF 20 27 26 I Reference current terminal — — 12 — — 13 NC — No connection — — 28 — — 29 OUT0 28 7 4 O Constant current output OUT1 1 8 5 O Constant current output OUT2 2 9 6 O Constant current output OUT3 3 10 7 O Constant current output OUT4 4 11 8 O Constant current output OUT5 5 12 9 O Constant current output OUT6 6 13 10 O Constant current output OUT7 7 14 11 O Constant current output OUT8 8 15 14 O Constant current output OUT9 9 16 15 O Constant current output OUT10 10 17 16 O Constant current output OUT11 11 18 17 O Constant current output OUT12 12 19 18 O Constant current output OUT13 13 20 19 O Constant current output OUT14 14 21 20 O Constant current output OUT15 15 22 21 O Constant current output SCLK 25 4 1 I Serial data shift clock SIN 26 5 2 I Serial data input SOUT 17 24 23 O Serial data output VCC 21 28 27 I Power supply voltage Multifunction input pin. When VPRG = GND, the device is in GS mode. When VPRG = VCC, the device is in DC mode. When VPRG = V(VPRG), VPRG 27 6 3 I DC register data can programmed into DC EEPROM with DCPRG=HIGH. EEPROM data = 3 Fh (default) Error output. XERR is an open-drain terminal. XERR goes L when LOD XERR 16 23 22 O or TEF is detected. Level triggered latch signal. When XLAT = high, the TLC5940 writes data from the input shift register to either GS register (VPRG = low) or XLAT 24 3 32 I DC register (VPRG = high). When XLAT = low, the data in GS or DC register is held constant. 4 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated Product Folder Links: TLC5940 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Switching Characteristics 6.7 Typical Characteristics 7 Parameter Measurement Information 7.1 Test Parameter Equations 8 Detailed Description 8.1 Overview 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Serial Interface 8.3.2 Error Information Output 8.3.3 TEF: Thermal Error Flag 8.3.4 LOD: LED Open Detection 8.3.5 Delay Between Outputs 8.3.6 Output Enable 8.3.7 Setting Maximum Channel Current 8.4 Device Functional Modes 8.4.1 Operating Modes 8.4.2 Setting DOT Correction 8.4.3 Setting Grayscale 8.4.4 Status Information Output 8.4.5 Grayscale PWM Operation 9 Application and Implementation 9.1 Application Information 9.2 Typical Application 9.2.1 Design Requirements 9.2.2 Detailed Design Procedure 9.2.2.1 Serial Data Transfer Rate 9.2.2.2 Grayscale (GS) Data 9.2.3 Application Curve 10 Power Supply Recommendations 11 Layout 11.1 Layout Guidelines 11.2 Layout Example 11.3 Power Dissipation Calculation 12 Device and Documentation Support 12.1 Community Resources 12.2 Trademarks 12.3 Electrostatic Discharge Caution 12.4 Glossary 13 Mechanical, Packaging, and Orderable Information