UM10782 The NXP LCD driver with on
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1. aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors and its suppliers accept no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Customers are responsible for the design and operation of their applications and p2. 2 for 1 2 multiplex drive mode etc Proper Vrms values switching a pixel fully on and off Higher values of V cp lead to a loss of contrast since the pixel cannot be really driven OFF Votams 2 Vin see Figure 2 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 4 of 13 UM10782 NXP Semiconductors The NXP LCD driver with on chip charge pump ATA 100 90 Relative Transmission 10 7 Vrms V Vsat Voff RMS Von RMS OFF GREY ON SEGMENT SEGMENT SEGMENT aaa 011884 Fig 2 A too high Vicp causing that Voft Rms Vth Lower values of Vicp lead to loss of contrast since the pixel cannot be really driven ON Von RMs lt Vsat see Figure 3 ATA 100 90 Relative Transmission 10 4 l gt f Psa Vrus M Voff RMS Von RMS OFF GREY ON SEGMENT SEGMENT SEGMENT aaa 011885 A too low Vicp causing that Von rms lt Vsat Fig 3 There is only a strict range of Vicp values that lead to an optimum contrast the optimum Vat This product has value is that one that maximizes the product V Vasp V always to be positive NXP B V 2014 All rights reserved 5 of 13 All information provided in this document is subject to legal disclaimers Rev 1 00 20 February 2014 UM10782 User manual
3. NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump l i i 0 2 si Vth Voff i i Vih Voff Von Vsat i i 4 Von Vsat j 0 07 3 o5 m 0 33 gt c i i 5 Ss 2 1 1 Zc lt 0 l i 0 6 XS i i g gt i i gt S i 0 87 4 05 0 87 5 1 1 13 1 5 i i 1 4 1 5 2 2 5 3 3 5 4 45 5 5 5 Vreo V 0 4 0 2 r a E 3 S F 5 5 i 2a ZS 0 x gt sT E gt i gt j 02 Vth Vort Von Vsat i 1 Von Ysat Vth Voff 0 4 0 2 4 4 2 4 4 i 4 6 8 Vicp V aaa 011931 Vin 1 5 V Vsat 2 5 V MUX 1 4 bias 13 Fig 4 Optimum VLcp value to optimize the display contrast In summary to optimize the contrast 1 Vicp must be independent from the Vpp supply To be able to select the LCD voltage value and then optimize the display contrast independently from the Vpp supply 2 Vicp must be programmable in a wide range To be able to optimize the display contrast for a wide selection of LCDs with different 3 Vicp must be programmable with a small programming step and very accurate To guarantee that the programmed LCD voltage value is as much as possible close to the optimum value also across process variations UM10782 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manua
4. with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and customer s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 T
5. information The NXP LCD driver with on chip charge pump 5 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 5 2 Disclaimers Limited warranty and liability Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of any products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors
6. this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 8 of 13 NXP Semiconductors UM10782 4 References The NXP LCD driver with on chip charge pump UM10782 1 2 3 4 5 6 7 8 9 10 11 AN10170 Design guidelines for COG modules with NXP monochrome LCD drivers AN11267 EMC and system level ESD design guidelines for LCD drivers PCA8547 4 x 44 automotive LCD driver with integrated charge pump product data sheet PCA8543 4 x 60 automotive LCD segment driver with integrated charge pump product data sheet PCA8537 Automotive LCD driver for multiplex rates up to 1 8 product data sheet PCA9620 60 x 8 LCD high drive segment driver for automotive and industrial product data sheet PCA8538 Automotive 102 x 9 Chip On Glass LCD segment driver product data sheet PCA8539 100 x 18 Chip On Glass automotive LCD dot matrix driver product data sheet PCF2119 LCD controllers drivers product data sheet PCF21219 LCD driver for character displays product data sheet R_10015 Chip On Glass COG a cost effective and reliable technology for LCD displays All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 9 of 13 NXP Semiconductors UM10782 5 Legal
7. UM10782 The NXP LCD driver with on chip charge pump for the LCD supply voltage generation Rev 1 00 20 February 2014 User manual Document information Info Content Keywords Contrast LCD driver charge pump PCA8547 PCA8543 PCA8537 PCA9620 PCA8538 PCA8539 PCF2119 PCF21219 Abstract The most important parameter to assess the optical performance of a passive monochrome LCD is the display contrast Therefore the Vicp voltage must be set properly to gain an optimum contrast NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump Revision history Rev Date Description v 1 20140220 first revision Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10782 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 2 of 13 NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump 1 Introduction The most important parameter to assess the optical performance of a passive monochrome LCD is the display contrast 2 Display contrast UM10782 Assumed an LCD with a certain resolution a defined LCD drive mode commonly called multiplex rate and a defined LCD bias configuration commonly called bias system the display contrast depends on the V cp
8. generation including temperature compensation UM10782 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 7 of 13 NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump 3 LCD drivers with integrated charge pump Table 1 List of LCD drivers with integrated charge pump Product type Maximum Package Vicb Max charge Temperature resolution programmable pump range range multiplication factor Packaged LCD segment drivers PCA8547 4x 44 TQFP64 2 5 V to 9 0 V 3 x Vppe2 40 C to 95 C PCA8543 4x 60 LQFP80 2 5 V to 9 0 V 3 x Vppe 40 C to 105 C PCA8537 8 x 44 TQFP64 2 5 V to 9 0 V 3 x Vppe 40 C to 95 C PCA9620 8 x 60 LQFP80 2 5 V to 9 0 V 3 x Vppe 40 C to 105 C Chip On Glass LCD segment drivers PCA8538 9x 102 bare die 4 0 V to 12 0 V 5 x Vppe 40 C to 105 C PCA8539 18 x 100 bare die 4 0 V to 16 0 V 4 x Vpp2 40 C to 105 C Chip On Glass LCD character drivers PCA2117 1 line x 40 bare die 4 0 V to 16 0 V 4 x Vpp2 40 C to 105 C characters or 2 lines x 20 characters PCF2119 2 lines x 20 bare die 2 2 V to 6 5 V 4 x Vpp2 40 C to 85 C characters PCF21219 2 lines x 20 bare die 2 5 V to 6 5 V 4 x Vpp2 40 C to 85 C characters Choose the NXP LCD drivers with integrated charge pump that allow both high performance and low cost UM10782 All information provided in
9. he foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose Translations A non English translated version of a document is for reference only The English version shall prevail in case of any discrepancy between the translated and English versions 5 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 10 of 13 NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump 6 Tables Table 1 List of LCD drivers with integrated charge DUMP es Scab Wate ouverte oe cota Dead He 8 UM10782 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 11 of 13 NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump 7 Figures Fig 1 Proper Vams values switching a pixel fully on EIN OPP sects diene aicaae ats Wha a thee and Eas oda wade 4 Fig 2 A too high Vicp causing that VorRms Vih 5 Fig 3 A too low Vicp causing that Vonrms Vsat 5 Fig 4 Optimum Vicp value to optimize the display CONTASI 2 oi ccs ween a Se meme tlw Oov eae eee Ad 6 Fig 5 Vicp generation including temperature compensati
10. l Rev 1 00 20 February 2014 6 of 13 NXP Semiconductors U M1 0782 The NXP LCD driver with on chip charge pump 4 Vicp must be compensated over temperature to keep a high and stable contrast over the temperature range Since the display characteristics change over temperature Vicp should also change to maintain the best contrast over temperature Different solutions can be implemented by using discrete components In order to reduce the BOM and the overall system cost NXP has developed a wide portfolio of LCD drivers with an integrated charge pump and regulator to generate the Vicp on chip and allow programming the Vi cp value accurately in a wide range by simply programming a register through the interface The capacitors of the charge pump are also integrated on chip allowing reducing the number of external components to a minimum Further NXP has integrated a temperature sensor and a Vicp temperature compensation circuitry in order to compensate the Vi cp value with the temperature and to reach an optimum contrast all over the operating temperature range from 40 C to 85 C for the industrial and consumer LCD drivers and from 40 C to 95 C or even 105 C for the automotive qualified LCD drivers f e gt Voffset LCD TEMPERATURE MEASUREMENT VT 8 0 TEMPERATURE COMPENSATION x oi 0 03 4 i 9 9 VLCD 8 0 x 4 gt VLCD Vprog LCD aaa 006650 Fig 5 Vicp
11. on 0 00 eee eee eee eee 7 UM10782 All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 12 of 13 NXP Semiconductors UM10782 The NXP LCD driver with on chip charge pump 8 Contents 1 Introduction 6255 5 seas eee ee ees ew ee ee es 3 2 Display contrast 1 0 0 0 00 eee eee eee 3 3 LCD drivers with integrated charge pump 8 4 References ii iineg eden ce eee eee eee 9 5 Legal information 0 0 0seeeeee 10 5 1 Definitions 0 0 0 0 0 cee eee 10 5 2 DisclaimerS 0 0 c cece 10 5 3 Trademarks 0 e E 10 6 Tables eisini iee aca Re ww ee ere Sade Ba 11 7 FIQUICS 2 5652 ccs ee eE ERAAN Raa aA 12 8 Contents oe ieee aes cea cee eee 13 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP B V 2014 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 20 February 2014 Document identifier UM10782
12. roducts using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product UM10782 All information provided in this document is subject to legal disclaimers design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP Semiconductors does not accept any liability related to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect Export control This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from competent authorities Evaluation products This product is provided on an as is and
13. voltage also called operating voltage of the display For an optimum display contrast the Vicp voltage must be set in order that the following two conditions are met see Figure 1 1 VotRms lt Vin where Vip is the threshold voltage of the display defined as the RMS voltage corresponding to 10 relative transmission and Vox is the voltage supplied to drive the pixel OFF the condition VofRms lt Vin means that the pixel is really driven OFF 2 Vot Rms 2 Vsat where Vga is the saturation voltage of the display defined as the RMS voltage corresponding to 90 relative transmission and Von is the voltage supplied to drive the pixel ON the condition Von Rms Vsat Means that the pixel is really driven ON All information provided in this document is subject to legal disclaimers NXP B V 2014 All rights reserved User manual Rev 1 00 20 February 2014 3 of 13 NXP Semiconductors UM10782 UM10782 The NXP LCD driver with on chip charge pump Fig 1 ATA 100 90 Relative Transmission 10 4 Veat t Vrms V Voff RMS Von RMS OFF GREY ON SEGMENT SEGMENT SEGMENT aaa 011883 2 yv bias t 24bias Mux on RMS Vicp 2 Nyux x 1 bias Von RMS 2 Vinton 2 yV _ Dbias 24 bias t MUX off RMS Vico 1 2 Nyux X 1 Abias Votf RMS Vih off With apias 1 for 1 2 bias apias 2 for 13 bias etc and nyyx 1 for static drive mode nyux
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