Ordering number : EN4966A CMOS LSI LC75842E General-Purpose 1/2 Duty LCD Display Driver Overview Package Dimensions 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. 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 SANYO: QFP36 • 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. Specifications Absolute Maximum Ratings at Ta = 25°C, VSS = 0 V Parameter Maximum supply voltage Input voltage Output voltage Output current Allowable power dissipation Symbol VDD max Conditions Ratings Unit VDD –0.3 to +6.5 VIN1 CE, CL, DI, INH –0.3 to +6.5 V VIN2 OSC –0.3 to VDD + 0.3 V –0.3 to VDD + 0.3 V 100 µA VOUT OSC, S1 to S27, COM1, COM2 IOUT1 S1 to S27 IOUT2 COM1, COM2 Pd max Ta = 85°C V 1 mA 100 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –55 to +125 °C Allowable Operating Ranges at Ta = –40 to +85°C, VSS = 0 V Parameter Symbol Conditions Ratings min typ Supply voltage VDD VDD* Input high level voltage VIH CE, CL, DI, INH 0.8 VDD VIL CE, CL, DI, INH 0 Input low level voltage Recommended external resistance ROSC OSC Recommended external capacitance COSC OSC Guaranteed oscillator range fOSC OSC 4.0 max 5.0 6.0 V 6.0 V 0.2 VDD 68 V kΩ 680 25 Unit pF 50 100 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 Symbol Conditions Ratings min typ Unit max Low level clock pulse width tøL CL: Figure 1 160 ns High level clock pulse width tøH CL: Figure 1 160 ns Data setup time tds CL, DI: Figure 1 160 ns Data hold time tdh CL, DI: Figure 1 160 ns CE wait time tcp CE, CL: Figure 1 160 ns CE setup time tcs CE, CL: Figure 1 160 ns CE hold time tch CE, CL: Figure 1 160 ns INH switching time tc INH, CE: Figure 3 10 µs Electrical Characteristics in the Allowable Operating Ranges Parameter Symbol Conditions Hysteresis voltage VH CE, CL, DI, INH: VDD = 5.0 V Input high level current IIH CE, CL, DI, INH: VI = 6.0 V Input low level current Output high level voltage IIL Output middle level voltage typ Unit max 0.4 V 5.0 µA –5.0 µA VOH1 S1 to S27: IO = –10 µA VDD – 1.0 V VOH2 COM1, COM2: IO = –100 µA VDD – 0.6 VOL1 S1 to S27: IO = 10 µA 1.0 VOL2 COM1, COM2: IO = 100 µA 0.6 V VMID1 COM1, COM2: VDD = 6.0 V, IO = ±100 µA 2.4 3.0 3.6 V Output low level voltage VMID2 Oscillator frequency Current drain CE, CL, DI, INH: VI = 0 V Ratings min V V COM1, COM2: VDD = 4.0 V, IO = ±100 µA 1.4 2.0 2.6 V fOSC OSC: ROSC = 68 kΩ, COSC = 680 pF 40 50 60 kHz IDD1 Power saving mode 5 µA IDD2 VDD = 6.0 V, output open, fOSC = 50 kHz 1.2 2.0 mA 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 Active I/O Handling when unused Segment outputs for displaying the display data transferred by serial data input. — O Open Common driver outputs. The frame frequency fO is fOSC/512 Hz. — O Open I/O VDD I GND L I GND Pin No. 1 to 27 Function COM1 36 COM2 35 OSC 28 Oscillator connection. An oscillator circuit is formed by connecting an external resistor and capacitor at this pin. — CE 32 Serial data transfer inputs. Must be connected to the control microprocessor. H CL 33 DI 34 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 29 Power supply. Provide a power supply voltage of between 4.0 and 6.0 V. — — — VSS 31 Power supply. Connect this pin to ground. — — — 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 Mode 0 Normal mode 1 Power saving mode (The OSC pin oscillator is stopped and the common and segment pins go to the VSS level.) 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 Display state 0 On 1 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 COM1 COM2 Segment output pin COM1 COM2 S1 D1 D2 S15 D29 D30 S2 D3 D4 S16 D31 D32 S3 D5 D6 S17 D33 D34 S4 D7 D8 S18 D35 D36 S5 D9 D10 S19 D37 D38 S6 D11 D12 S20 D39 D40 S7 D13 D14 S21 D41 D42 S8 D15 D16 S22 D43 D44 S9 D17 D18 S23 D45 D46 S10 D19 D20 S24 D47 D48 S11 D21 D22 S25 D49 D50 S12 D23 D24 S26 D51 D52 S13 D25 D26 S27 D53 D54 S14 D27 D28 For example, the table below lists the output states for the S11 segment output pin. Display data Segment output pin (S11) state D21 D22 0 0 Both segments for COM1 and COM2 are off. 0 1 Segment for COM2 is on. 1 0 Segment for COM1 is on. 1 1 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 ■ 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. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ 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: ➁ 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. ■ 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