LMC7532

ADVANCED INFORMATION NOV, 1997 LMC7532 Low EMI, Low Power XGA/SVGA TFT-LCD Column Driver General description The LMC7532 is a Column Driver suitable for National’s Reduced Swing Differential Signalling (RSDS) digital interface. It converts this 18-bit digital data into analog voltage for 300 or 309 columns, charging each sub-pixel to the correct gray level corresponding to the digital value. The RSDS path to the panel timing controller contributes toward lowering radiated EMI, reducing system power consumption and eliminates one of the two pixel busses used in typical XGA TFT-LCD panels today. This single 9-bit differential bus conveys the 18-bit color data for XGA panels at 130Mb/s when using VESA 60 Hz standard timing. With the addition of a single National DS90CF364 or ‘564 FPD-Link™ chip, and the FPD63310 Universal Interface XGA/SVGA Timing controller, the entire data path is optimized for reduced EMI, power consumption and width. Feature s Reduced Swing Differential Signalling (RSDS)™ digital bus reduces power, EMI and width from timing controller. s Selectable 300/309 outputs provides ability to drive SVGA and XGA TFT-LCD systems. s Switched reference type DAC gives high accuracy with low reference current requirements. 65MHZ s Clock Frequency up to: +/-5 mV s Typical Accuracy: s Narrow bus. s 64 gray scales. s Receive RSDS @ 130Mb/s width @ 65MHz clock from FPD 63310. System Diagram Gray Scale Voltage Reference BUS Line Transfer Signal /9 + CLK, RSDS BUS Start Pulse Gray scale Reference Inversion Control /2 Link1 /2 Link2 /2 Link3 /2 LinkC LMC7532 1 n LMC7532 1 n LMC7532 1 n LMC7532 1 n Start Pulse A1 DS90CF564 /364 FPD-Link FPD63310 XGA Panel Timing Controller RA An Gate Clock 1024 X 768 or 800 X 600 TFT-LCD Array VDD VSS RE En Panel Power Supply NM93CSxxL Serial EEPROM E1 FIGURE 1. Block diagram of the LCD module FPD-Link™ is a trademark of National Semiconductor ©1997 NSC 1 http://www.national.com Package Infomation COM1 COM1 AVSS AVDD VO P VREF1 1 VREF9 VREF7 VREF5 VREF3 VREF1 DVDD DG ND NOUT30 9 DVDD R/L D2 0P D2 0N D2 1P D2 1N D2 2P D2 2N TP1 EIO2 DVDD CLKN CLKP DG ND EIO1 D1 0P D1 0N D1 1P D1 1N D1 2P D1 2N D0 0P D0 0N D0 1P D0 1N D0 2P D0 2N DVDD DG ND DVDD VREF2 VREF4 VREF6 VREF8 VREF1 0 V OP AVDD AVSS COM2 COM2 LMC7532 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. OUT012 OUT011 OUT010 OUT009 OUT008 OUT007 OUT006 OUT005 OUT004 OUT003 OUT002 OUT001 DUMMY DUMMY DUMMY DUMMY COM2 COM2 COM1 COM1 DUMMY DUMMY DUMMY DUMMY OUT309 OUT308 OUT307 OUT306 OUT305 OUT304 OUT303 OUT302 OUT301 OUT300 OUT299 OUT298 top View LMC7532 Polyimide Copper Solder resister FIGURE 10. TCP pin assignment Order number LMC7532CTxx xx = customer package designator. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: Email: Deutsch Tel: English Tel: (+49) 0-180-530 85 86 europe.support@nsc.com (+49) 0-180-530 85 85 (+49) 0-180-532 78 32 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Response Group Tel: 65-254-4466 Fax: 65-250-4466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 www.national.com 13