LC75842

Ordering number : EN4966A CMOS LSI LC75842E General-Purpose 1/2 Duty LCD Display Driver Overview The LC75842E is a 1/2 duty general-purpose LCD display driver for applications such as microprocessor-controlled electronic tuning. It can drive up to 54 segments directly. Package Dimensions unit: mm 3162B-QFP36 [LC75842E] Features • 1/2 duty, 1/2 bias drive of up to 54 segments • Serial data input supports CCB* format communication with the system controller. • Backup function which is based on a power saving mode and all segments off functions that are controlled by serial data. • High generality, since display data is displayed directly without decoder intervention. • The display can be forced to the off state with the INH pin. • RC oscillator circuit • CCB is a trademark of SANYO ELECTRIC CO., LTD. • CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO. SANYO: QFP36 Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Maximum supply voltage Input voltage Output voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol VDD max VIN1 VIN2 VOUT IOUT1 IOUT2 Pd max Topr Tstg VDD CE, CL, DI, INH OSC OSC, S1 to S27, COM1, COM2 S1 to S27 COM1, COM2 Ta = 85°C Conditions Ratings –0.3 to +6.5 –0.3 to +6.5 –0.3 to VDD + 0.3 –0.3 to VDD + 0.3 100 1 100 –40 to +85 –55 to +125 Unit V V V V µA mA mW °C °C Allowable Operating Ranges at Ta = –40 to +85°C, VSS = 0 V Parameter Supply voltage Input high level voltage Input low level voltage Recommended external resistance Recommended external capacitance Guaranteed oscillator range Symbol VDD VIH VIL ROSC COSC fOSC VDD* CE, CL, DI, INH CE, CL, DI, INH OSC OSC OSC 25 Conditions Ratings min 4.0 0.8 VDD 0 68 680 50 100 typ 5.0 max 6.0 6.0 0.2 VDD Unit V V V kΩ pF kHz Note: * Please contact your Sanyo sales representative if you need to operate the LC75842E at a power supply voltage VDD of 3.0 V (min.). Continued on next page. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 41096HA (OT)/61595HA (OT) No. 4966-1/9 LC75842E Continued from preceding page. Parameter Low level clock pulse width High level clock pulse width Data setup time Data hold time CE wait time CE setup time CE hold time INH switching time Symbol tøL tøH tds tdh tcp tcs tch tc CL: Figure 1 CL: Figure 1 CL, DI: Figure 1 CL, DI: Figure 1 CE, CL: Figure 1 CE, CL: Figure 1 CE, CL: Figure 1 INH, CE: Figure 3 Conditions Ratings min 160 160 160 160 160 160 160 10 typ max Unit ns ns ns ns ns ns ns µs Electrical Characteristics in the Allowable Operating Ranges Parameter Hysteresis voltage Input high level current Input low level current Output high level voltage Symbol VH IIH IIL VOH1 VOH2 VOL1 VOL2 VMID1 VMID2 fOSC IDD1 IDD2 Conditions CE, CL, DI, INH: VDD = 5.0 V CE, CL, DI, INH: VI = 6.0 V CE, CL, DI, INH: VI = 0 V S1 to S27: IO = –10 µA COM1, COM2: IO = –100 µA S1 to S27: IO = 10 µA COM1, COM2: IO = 100 µA COM1, COM2: VDD = 6.0 V, IO = ±100 µA COM1, COM2: VDD = 4.0 V, IO = ±100 µA OSC: ROSC = 68 kΩ, COSC = 680 pF Power saving mode VDD = 6.0 V, output open, fOSC = 50 kHz 1.2 2.4 1.4 40 3.0 2.0 50 –5.0 VDD – 1.0 VDD – 0.6 1.0 0.6 3.6 2.6 60 5 2.0 Ratings min typ 0.4 5.0 max Unit V µA µA V V V V V V kHz µA mA Output low level voltage Output middle level voltage Oscillator frequency Current drain 1. When CL is stopped at the low level 2. When CL is stopped at the high level Figure 1 No. 4966-2/9 LC75842E Pin Assignment Block Diagram Pin Functions Pin S1 to S27 COM1 COM2 OSC Pin No. 1 to 27 36 35 28 Function Segment outputs for displaying the display data transferred by serial data input. Common driver outputs. The frame frequency fO is fOSC/512 Hz. Oscillator connection. An oscillator circuit is formed by connecting an external resistor and capacitor at this pin. Serial data transfer inputs. Must be connected to the control microprocessor. CE: Chip enable CL: Synchronization clock DI: Transfer data Display off control input INH = low (VSS) .....Display off (S1 to S27, COM1 and COM2 = low) INH 30 INH = high (VDD)....Display on However, serial data transfer is possible when the display is forced off by this pin. VDD VSS 29 31 Power supply. Provide a power supply voltage of between 4.0 and 6.0 V. Power supply. Connect this pin to ground. — — — — — — L I GND Active — — I/O O O Handling when unused Open Open — I/O VDD CE CL DI 32 33 34 H I — GND No. 4966-3/9 LC75842E Serial Data Transfer Format 1. When CL is stopped at the low level No. 4966-4/9 LC75842E 2. When CL is stopped at the high level Figure 2 • CCB address......44H • D1 to D54..........Display data Dn (n = 1 to 54) = 1: Segment on Dn (n = 1 to 54) = 0: Segment off • BU .....................Control data for specifying normal mode or power saving mode • SC......................Control data for specifying all segments on or off Serial Data Transfer Example When 29 or more segments are used all 80 bits of the serial data must be sent. When fewer than 29 segments are used only the first 40 bits of the serial data can be sent. However, all 80 bits must be sent after power is first applied. Note: The following type of transfer cannot be used when fewer than 29 segments are used. No. 4966-5/9 LC75842E Control Data Functions 1. BU: Control data for specifying normal mode or power saving mode This control data bit is used to control the normal mode/power saving mode state of the LC75842E. BU 0 1 Normal mode Power saving mode (The OSC pin oscillator is stopped and the common and segment pins go to the VSS level.) Mode 2. SC: Control data for specifying all segments on or off This control data bit is used to turn all segments on or off. SC 0 1 Display state On Off Note that when SC is 1 the display is turned off by outputting the segment off waveforms from the segment pins. Correspondence between Display Data and Segment Output Pins Segment output pin S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 COM1 D1 D3 D5 D7 D9 D11 D13 D15 D17 D19 D21 D23 D25 D27 COM2 D2 D4 D6 D8 D10 D12 D14 D16 D18 D20 D22 D24 D26 D28 Segment output pin S15 S16 S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 COM1 D29 D31 D33 D35 D37 D39 D41 D43 D45 D47 D49 D51 D53 COM2 D30 D32 D34 D36 D38 D40 D42 D44 D46 D48 D50 D52 D54 For example, the table below lists the output states for the S11 segment output pin. Display data D21 0 0 1 1 D22 0 1 0 1 Segment output pin (S11) state Both segments for COM1 and COM2 are off. Segment for COM2 is on. Segment for COM1 is on. Both segments for COM1 and COM2 are on. No. 4966-6/9 LC75842E Output Waveforms (1/2 duty, 1/2 bias drive) INH and Display Control Since the LSI internal data (D1 to D54 and control data) is undefined when power is first applied, the display is turned off (S1 to S27, COM1 and COM2 = low) by setting INH pin low at the same time as power is applied. Then, meaningless display at the power on can be prevented by transferring all 80 bits of serial data from the controller while the display is turned off and INH pin high after the transfer completes. (See Figure 3.) Figure 3 No. 4966-7/9 LC75842E Notes on Transferring Display Data from the Controller Since the LC75842E takes the display data (D1 to D54) in two separate transfer operations as shown in Figure 2, we recommend that all the display data be transferred within 30 [ms] to maintain the quality of the displayed image. Sample Display Sample Application Circuit 1 Sample Application Circuit 2 No. 4966-8/9 LC75842E s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Œ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use:  Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of December, 1997. Specifications and information herein are subject to change without notice. No. 4966-9/9