SANYO LC75842E Datasheet

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.

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

Package Dimensions

unit: mm

3162B-QFP36

CMOS LSI

41096HA (OT)/61595HA (OT) No. 4966-1/9

SANYO: QFP36

[LC75842E]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

General-Purpose 1/2 Duty LCD Display Driver

LC75842E

Ordering number : EN4966A

• 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 Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max V

DD

–0.3 to +6.5 V

Input voltage

V

IN

1 CE, CL, DI, INH –0.3 to +6.5 V

V

IN

2 OSC –0.3 to VDD+ 0.3 V

Output voltage V

OUT

OSC, S1 to S27, COM1, COM2 –0.3 to VDD+ 0.3 V

Output current

I

OUT

1 S1 to S27 100 µA

I

OUT

2 COM1, COM2 1 mA
Allowable power dissipation Pd max Ta = 85°C 100 mW
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –55 to +125 °C

Parameter Symbol Conditions

Ratings

Unit

min typ max

Supply voltage V

DDVDD

* 4.0 5.0 6.0 V

Input high level voltage V

IH

CE, CL, DI, INH 0.8 V

DD

6.0 V

Input low level voltage V

IL

CE, CL, DI, INH 0 0.2 V

DD

V

Recommended external resistance R

OSC

OSC 68 kΩ

Recommended external capacitance C

OSC

OSC 680 pF

Guaranteed oscillator range f

OSC

OSC 25 50 100 kHz

Allowable Operating Ranges at Ta = –40 to +85°C, VSS= 0 V

Note: * Please contact your Sanyo sales representative if you need to operate the LC75842E at a power supply voltage VDDof 3.0 V (min.).

Continued on next page.

No. 4966-2/9

LC75842E

Continued from preceding page.

Parameter Symbol Conditions

Ratings

Unit

min typ max

Low level clock pulse width t

øL

CL: Figure 1 160 ns

High level clock pulse width t

øH

CL: Figure 1 160 ns

Data setup time t

ds

CL, DI: Figure 1 160 ns

Data hold time t

dh

CL, DI: Figure 1 160 ns

CE wait time t

cp

CE, CL: Figure 1 160 ns

CE setup time t

cs

CE, CL: Figure 1 160 ns

CE hold time t

ch

CE, CL: Figure 1 160 ns

INH switching time t

c

INH, CE: Figure 3 10 µs

Parameter Symbol Conditions

Ratings

Unit

min typ max

Hysteresis voltage V

H

CE, CL, DI, INH: VDD= 5.0 V 0.4 V

Input high level current I

IH

CE, CL, DI, INH: VI= 6.0 V 5.0 µA

Input low level current I

IL

CE, CL, DI, INH: VI= 0 V –5.0 µA

Output high level voltage

V

OH

1 S1 to S27: IO= –10 µA VDD– 1.0 V

V

OH

2 COM1, COM2: IO= –100 µA VDD– 0.6 V

Output low level voltage

V

OL

1 S1 to S27: IO= 10 µA 1.0 V

V

OL

2 COM1, COM2: IO= 100 µA 0.6 V

Output middle level voltage

V

MID

1 COM1, COM2: VDD= 6.0 V, IO= ±100 µA 2.4 3.0 3.6 V

V

MID

2 COM1, COM2: VDD= 4.0 V, IO= ±100 µA 1.4 2.0 2.6 V
Oscillator frequency f

OSC

OSC: R

OSC

= 68 kΩ, C

OSC

= 680 pF 40 50 60 kHz

Current drain

I

DD

1 Power saving mode 5 µA

I

DD

2 VDD= 6.0 V, output open, f

OSC

= 50 kHz 1.2 2.0 mA

Electrical Characteristics in the Allowable Operating Ranges

1. When CL is stopped at the low level

2. When CL is stopped at the high level

Figure 1

Pin Assignment

No. 4966-3/9

LC75842E

Block Diagram

Pin Pin No. Function Active I/O

Handling when

unused
S1 to S27
COM1

COM2

OSC

CE
CL
DI

INH

V

DD

V

SS

1 to 27

36
35

28

32
33
34

30

29
31

Segment outputs for displaying the display data transferred by serial data input.

Common driver outputs. The frame frequency f

O

is f

OSC

/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 (V

SS

).....Display off (S1 to S27, COM1 and COM2 = low)

INH = high (V

DD

)....Display on

However, serial data transfer is possible when the display is forced off by this
pin.

Power supply. Provide a power supply voltage of between 4.0 and 6.0 V.
Power supply. Connect this pin to ground.

—

—

—

L

—
—

H

—

O

O

I/O

I

I

—
—

Open

Open

V

DD

GND

GND

—
—

Pin Functions