PCA85276 Automotive LCD driver for low multiplex rates Rev. 1 — 11 February 2014 Product data sheet 1. General description The PCA85276 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD)1 with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 40 segments. It can be easily cascaded for larger LCD applications.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Manufactured in silicon gate CMOS process 3. Ordering information Table 1. Ordering information Type number Package PCA85276ATT Name Description Version TSSOP56 plastic thin shrink small outline package, 56 leads; body width 6.1 mm SOT364-1 3.1 Ordering options Table 2.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 5. Block diagram %3 %3 %3 %3 6 WR 6 9/&' %$&.3/$1( 2873876 ',63/$< 6(*0(17 2873876 ',63/$< 5(*,67(5 /&' 92/7$*( 6(/(&725 966 &/. 6<1& 26& ',63/$< &21752//(5 /&' %,$6 *(1(5$725 &/2&. 6(/(&7 $1' 7,0,1* 287387 %$1. 6(/(&7 $1' %/,1. &21752/ ',63/$< 5$0 %/,1.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 6. Pinning information 6.1 Pinning %3 %3 %3 9/&' %3 966 6 6$ 6 $ 6 $ 6 $ 6 26& 6 9'' 6 &/.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 6.2 Pin description Table 4. Pin description of PCA85276ATT (TSSOP56) Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Table 6. C bit description Bit Symbol 7 C Value Description continue bit 0 last control byte in the transfer; next byte will be regarded as display data 1 control bytes continue; next byte will be a command too 7.1.1 Command: mode-set The mode-set command allows configuring the multiplex mode, the bias levels and enabling or disabling the display. Table 7.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Table 9. Device-select command bit description See Section 7.6.2. Bit Symbol Value Description 7 C 0, 1 see Table 6 6 to 3 - 1100 fixed value 2 to 0 A[2:0] 000 to 111 3-bit binary value, 0 to 7; transferred to the subaddress counter to define one of eight hardware subaddresses 7.1.4 Command: bank-select The bank-select command controls where data is written to RAM and where it is displayed from. Table 10.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.1.5.1 Blinking The display blinking capabilities of the PCA85276 are very versatile. The whole display can blink at frequencies selected by the blink-select command (see Table 11). The blink frequencies are derived from the clock frequency. The ratio between the clock and blink frequencies depends on the blink mode selected (see Table 12). An additional feature is for an arbitrary selection of LCD elements to blink.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates – bits M[1:0] to the required LCD drive mode • Load-data-pointer command (see Table 8), setting – bits P[5:0] to 0h (or any other required address) • Device-select command (see Table 9), setting – bits A[2:0] to the required hardware subaddress (for example, 0h) • Bank-select command (see Table 10), setting – bit I to 0 – bit O to 0 • Blink-select command (see Table 11), setting – bit AB to 0 or 1 – bits BF[1:0] to 00 (or to a
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Table 13. Selection of possible display configurations Number of Backplanes Icons Digits/Characters 7-segment[1] 14-segment[2] Dot matrix/ Elements 3 120 15 7 120 (3 40) 2 80 10 5 80 (2 40) 1 40 5 2 40 (1 40) [1] 7 segment display has 8 elements including the decimal point. [2] 14 segment display has 16 elements including decimal point and accent dot.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Discrimination is a term which is defined as the ratio of the on and off RMS voltage across a segment. It can be thought of as a measurement of contrast. Table 14.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with 1⁄ 2 bias is 1⁄ 2 21 bias is ---------- = 1.528 . 3 3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD as follows: • 1:3 multiplex (1⁄2 bias): V LCD = 6 V off RMS = 2.449V off RMS 4 3 - = 2.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 5HODWLYH 7UDQVPLVVLRQ 9WK RII 2)) 6(*0(17 9WK RQ *5(< 6(*0(17 9506 >9@ 21 6(*0(17 DDD Fig 5. PCA85276 Product data sheet Electro-optical characteristic: relative transmission curve of the liquid All information provided in this document is subject to legal disclaimers. Rev. 1 — 11 February 2014 © NXP B.V. 2014. All rights reserved.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.3.4 LCD drive mode waveforms 7.3.4.1 Static drive mode The static LCD drive mode is used when a single backplane is provided in the LCD. The backplane (BPn) and segment (Sn) drive waveforms for this mode are shown in Figure 6.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.3.4.2 1:2 Multiplex drive mode When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The PCA85276 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in Figure 7 and Figure 8.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7IU 9/&' %3 %3 /&' VHJPHQWV 9/&' 9/&' 966 VWDWH 9/&' 9/&' VWDWH 9/&' 966 9/&' 6Q 9/&' 9/&' 966 9/&' 6Q 9/&' 9/&' 966 D :DYHIRUPV DW GULYHU 9/&' 9/&' VWDWH 9/&' 9 9/&' 9/&' 9/&' 9/&' 9/&' 9/&' VWDWH 9 9/&' 9/&' 9/&' E 5HVXOWDQW ZDYHIRUPV DW /&' VHJPHQW DDD Vstate1(t) = VSn(t) VBP0(t). Von(RMS) = 0.745VLCD. Vstate2(t) = VSn(t) VBP1(t).
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.3.4.3 1:3 Multiplex drive mode When three backplanes are provided in the LCD, the 1:3 multiplex drive mode applies, as shown in Figure 9.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.3.4.4 1:4 Multiplex drive mode When four backplanes are provided in the LCD, the 1:4 multiplex drive mode applies as shown in Figure 10.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.4 Oscillator 7.4.1 Internal clock The internal logic of the PCA85276 and its LCD drive signals are timed either by its internal oscillator or by an external clock. The internal oscillator is enabled by connecting pin OSC to pin VSS. If the internal oscillator is used, the output from pin CLK can be used as the clock signal for several PCA85276 in the system that are connected in cascade. 7.4.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates There is a one-to-one correspondence between • the bits in the RAM bitmap and the LCD elements • the RAM columns and the segment outputs • the RAM rows and the backplane outputs. A logic 1 in the RAM bitmap indicates the on-state of the corresponding LCD element; similarly, a logic 0 indicates the off-state.
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PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.6.1 Data pointer The addressing mechanism for the display RAM is realized using the data pointer. This allows the loading of an individual display data byte, or a series of display data bytes, into any location of the display RAM. The sequence commences with the initialization of the data pointer by the load-data-pointer command (see Table 8).
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Table 15. Standard RAM filling in 1:3 multiplex drive mode Assumption: BP2/S2, BP2/S5, BP2/S8 etc. are not connected to any elements on the display.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 7.6.5 Bank selection 7.6.5.1 Output bank selector The output bank selector (see Table 10 on page 7) selects one of the four rows per display RAM address for transfer to the display register. The actual row selected depends on the particular LCD drive mode in operation and on the instant in the multiplex sequence.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates There are two banks; bank 0 and bank 1. Figure 13 shows the location of these banks relative to the RAM map. Input and output banks can be set independently from one another with the Bank-select command (see Table 10 on page 7). Figure 14 shows the concept. LQSXW EDQN VHOHFWLRQ FRQWUROV WKH LQSXW GDWD SDWK RXWSXW EDQN VHOHFWLRQ FRQWUROV WKH RXWSXW GDWD SDWK %$1. 0,&52&21752//(5 ',63/$< 5$0 %$1. DDD Fig 14.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 8. Characteristics of the I2C-bus The I2C-bus is for bidirectional, two-line communication between different ICs or modules. The two lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy. 8.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 0$67(5 75$160,77(5 5(&(,9(5 6/$9( 75$160,77(5 5(&(,9(5 6/$9( 5(&(,9(5 0$67(5 75$160,77(5 5(&(,9(5 0$67(5 75$160,77(5 6'$ 6&/ PJD Fig 18. System configuration 8.4 Acknowledge The number of data bytes transferred between the START and STOP conditions from transmitter to receiver is unlimited. Each byte of eight bits is followed by an acknowledge cycle.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 8.5 I2C-bus controller The PCA85276 acts as an I2C-bus slave receiver. It does not initiate I2C-bus transfers or transmit data to an I2C-bus master receiver. The only data output from the PCA85276 are the acknowledge signals of the selected devices. Device selection depends on the I2C-bus slave address, on the transferred command data and on the hardware subaddress.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates DFNQRZOHGJH E\ $ $ DQG $ VHOHFWHG 3&$ RQO\ DFNQRZOHGJH E\ DOO DGGUHVVHG 3&$ 5 : VODYH DGGUHVV 6 6 $ $ & E\WH &200$1' $ Q E\WH V ',63/$< '$7$ $ 3 Q E\WH V XSGDWH GDWD SRLQWHUV DQG LI QHFHVVDU\ VXEDGGUHVV FRXQWHU DDD Fig 20. I2C-bus protocol After an acknowledgement, one or more command bytes follow that define the status of each addressed PCA85276.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 9. Internal circuitry 9'' 9'' 966 966 6$ 9'' &/. 6&/ 966 9'' 966 26& 966 9'' 6'$ 6<1& 966 966 9'' $ $ $ 966 9/&' %3 %3 %3 %3 966 9/&' 9/&' 6 WR 6 966 966 PGE Fig 22. Device protection circuits PCA85276 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 11 February 2014 © NXP B.V. 2014. All rights reserved.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 10. Safety notes CAUTION This device is sensitive to ElectroStatic Discharge (ESD). Observe precautions for handling electrostatic sensitive devices. Such precautions are described in the ANSI/ESD S20.20, IEC/ST 61340-5, JESD625-A or equivalent standards. CAUTION Static voltages across the liquid crystal display can build up when the LCD supply voltage (VLCD) is on while the IC supply voltage (VDD) is off, or vice versa.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 12. Static characteristics Table 19. Static characteristics VDD = 1.8 V to 5.5 V; VSS = 0 V; VLCD = 2.5 V to 8.0 V; Tamb = 40 C to +105 C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit supply voltage VLCD 6.5 V 1.8 - 5.5 V VLCD > 6.5 V 2.5 - 5.5 V VDD < 2.5 V 2.5 - 6.5 V 2.5 - 8.0 V - 6 20 A - 2.7 - A - 18 32 A - 17.5 - A VSS - 0.3VDD V 0.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates Table 19. Static characteristics …continued VDD = 1.8 V to 5.5 V; VSS = 0 V; VLCD = 2.5 V to 8.0 V; Tamb = 40 C to +105 C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit 100 - +100 mV on pins BP0 to BP3 - 1.5 - k on pins S0 to S39 - 6.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 13. Dynamic characteristics Table 20. Dynamic characteristics VDD = 1.8 V to 5.5 V; VSS = 0 V; VLCD = 2.5 V to 8.0 V; Tamb = 40 C to +105 C; unless otherwise specified.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates IFON WFON + WFON / 9'' &/. 9'' 9'' 6<1& 9'' W3' 6<1&B1 W6<1&B1/ %3Q 6Q W3' GUY DDD Fig 24. Driver timing waveforms 6'$ W%8) W/2: WI 6&/ W+' 67$ WU W+' '$7 W+,*+ W68 '$7 6'$ W68 67$ W68 672 PJD Fig 25. I2C-bus timing waveforms PCA85276 Product data sheet All information provided in this document is subject to legal disclaimers. Rev.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 14. Application information 14.1 Cascaded operation Large display configurations of up to 16 PCA85276 can be recognized on the same I2C-bus by using the 3-bit hardware subaddress (A0, A1, and A2) and the programmable I2C-bus slave address (SA0). Table 21.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 9'' 9/&' 6'$ VHJPHQW GULYHV 6&/ 6<1& 3&$ &/. %3 WR %3 RSHQ FLUFXLW 26& $ $ $ 6$ 966 /&' 3$1(/ 9/&' 9'' 5 WU &E 9'' 9/&' VHJPHQW GULYHV 6'$ +267 0,&52 &21752//(5 6&/ 6<1& 3&$ &/. %3 WR %3 26& $ 966 EDFNSODQHV $ $ 6$ 966 DDD (1) Is master (OSC connected to VSS). (2) Is slave (OSC connected to VDD). Fig 26.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates If an external clock source is used, all PCA85276 in the cascade must be configured such as to receive the clock from that external source (pin OSC connected to VDD). Thereby it must be ensured that the clock tree is designed such that on all PCA85276 the clock propagation delay from the clock source to all PCA85276 in the cascade is as equal as possible since otherwise synchronization artifacts may occur.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 16.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 17. Handling information All input and output pins are protected against ElectroStatic Discharge (ESD) under normal handling. When handling Metal-Oxide Semiconductor (MOS) devices ensure that all normal precautions are taken as described in JESD625-A, IEC 61340-5 or equivalent standards. PCA85276 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 11 February 2014 © NXP B.V.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 18. Packing information 18.1 Tape and reel information For tape and reel packing information, please see Ref. 12 “SOT364-1_118” on page 49. PCA85276 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 11 February 2014 © NXP B.V. 2014. All rights reserved.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 19. Soldering of SMD packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 “Surface mount reflow soldering description”. 19.1 Introduction to soldering Soldering is one of the most common methods through which packages are attached to Printed Circuit Boards (PCBs), to form electrical circuits.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 19.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates temperature maximum peak temperature = MSL limit, damage level minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 29. Temperature profiles for large and small components For further information on temperature profiles, refer to Application Note AN10365 “Surface mount reflow soldering description”. 20.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates )RRWSULQW LQIRUPDWLRQ IRU UHIORZ VROGHULQJ RI 76623 SDFNDJH 627 +[ *[ 3 +\ *\ %\ $\ & ' [ ' 3 *HQHULF IRRWSULQW SDWWHUQ 5HIHU WR WKH SDFNDJH RXWOLQH GUDZLQJ IRU DFWXDO OD\RXW VROGHU ODQG RFFXSLHG DUHD ',0(16,216 LQ PP 3 3 $\ %\ & ' ' *[ *\ +[ +\ VRW BIU Fig 30.
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PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 22. Abbreviations Table 25.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 23.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 24. Revision history Table 26. Revision history Document ID Release date Data sheet status Change notice Supersedes PCA85276 v.1 20140211 Product data sheet - - PCA85276 Product data sheet All information provided in this document is subject to legal disclaimers. Rev. 1 — 11 February 2014 © NXP B.V. 2014. All rights reserved.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 25. Legal information 25.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates No offer to sell or license — Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Translations — A non-English (translated) version of a document is for reference only.
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 27. Tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Ordering information . . . . . . . . . . . . . . . . . . . . .2 Ordering options . . . . . . . . . . . . . . . . . . . . . . . . .2 Marking codes . . . . . . . . . . . . .
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 28. Figures Fig 1. Fig 2. Fig 3. Fig 4. Fig 5. Fig 6. Fig 7. Fig 8. Fig 9. Fig 10. Fig 11. Fig 12. Fig 13. Fig 14. Fig 15. Fig 16. Fig 17. Fig 18. Fig 19. Fig 20. Fig 21. Fig 22. Fig 23. Fig 24. Fig 25. Fig 26. Fig 27. Fig 28. Fig 29. Fig 30. Block diagram of PCA85276 . . . . . . . . . . . . . . . . .3 Pinning diagram for PCA85276ATT (TSSOP56) . .4 Example of displays suitable for PCA85276 . . . . .
PCA85276 NXP Semiconductors Automotive LCD driver for low multiplex rates 29. Contents 1 2 3 3.1 4 5 6 6.1 6.2 7 7.1 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.5.1 7.2 7.3 7.3.1 7.3.2 7.3.3 7.3.3.1 7.3.4 7.3.4.1 7.3.4.2 7.3.4.3 7.3.4.4 7.4 7.4.1 7.4.2 7.4.3 7.5 7.5.1 7.5.2 7.6 7.6.1 7.6.2 7.6.3 7.6.4 7.6.5 7.6.5.1 7.6.5.2 7.6.5.3 8 8.1 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . .