SANYO LC75874W, LC75874E Datasheet

Overview

The LC75874E and LC75874W are 1/4-duty generalpurpose microprocessor-controlled LCD driver that can be used in applications such as frequency display in products with electronic tuning. In addition to being able to drive up to 264 segments directly, the LC75874E and LC75874W can also control up to 8 general-purpose output ports. Since the LC75874E and LC75874W use separate power supply systems for the LCD drive block and the logic block, the LCD driver block power-supply voltage can be set to any voltage in the range 2.7 to 6.0 V, regardless of the logic block power-supply voltage.

Features

• Support for 1/4-duty 1/2-bias or 1/4-duty 1/3-bias drive techniques under serial data control (up to 264 segments)

• Serial data input supports CCB format communication with the system controller.

• Serial data control of the power-saving mode based backup function and the all segments forced off function.

• Serial data control of switching between the segment output port and general-purpose output port functions.

• High generality, since display data is displayed directly without the intervention of a decoder circuit.

• Independent V

LCD

for the LCD driver block (V

LCD

can be set to any voltage in the range 2.7 to 6.0 V, regardless of the logic block power-supply voltage.)

• The INH pin allows the display to be forced to the off state.

• RC oscillator circuit

Package Dimensions

unit: mm

3174-QFP80E

unit: mm

3220-SQFP80

CMOS LSI

Ordering number : EN5800

31398RM (OT) No. 5800-1/16

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

LC75874E, 75874W

1/4-Duty General-Purpose LCD Display Driver

[LC75874E]

SANYO: QFP80E

[LC75874W]

SANYO: SQFP80

• 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

No. 4465-No. 5800-2/16

LC75874E, 75874W

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage

V

DD

max V

DD

–0.3 to +7.0

V

LCD

max V

LCD

–0.3 to +7.0

V

IN

1 CE, CL, DI, INH –0.3 to +7.0

Input voltage V

IN

2 OSC –0.3 to VDD+ 0.3 V

V

IN

3 V

LCD

1, V

LCD

2 –0.3 to V

LCD

+ 0.3

Output voltage

V

OUT

1 OSC –0.3 to V

DD

+ 0.3

V

OUT

2 S1 to S66, COM1 to COM4, P1 to P8 –0.3 to V

LCD

+ 0.3

I

OUT

1 S1 to S66 300 µA

Output current I

OUT

2 COM1 to COM4 3

mA

I

OUT

3 P1 to P8 5 Allowable power dissipation Pd max Ta = 85°C 200 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

DD

V

DD

2.7 6.0 V

V

LCDVLCD

2.7 6.0

Input voltage

V

LCD

1 V

LCD

1 2/3 V

LCD

V

LCD

V

LCD

2 V

LCD

2 1/3 V

LCD

V

LCD

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

R

OSC

OSC 43 kΩ

resistance Recommended external

C

OSC

OSC 680 pF

capacitance Guaranteed oscillation range f

OSC

OSC 25 50 100 kHz

Data setup time t

ds

CL, DI: Figure 2 160 ns

Data hold time t

dh

CL, DI: Figure 2 160 ns

CE wait time t

cp

CE, CL: Figure 2 160 ns

CE setup time t

cs

CE, CL: Figure 2 160 ns

CE hold time t

ch

CE, CL: Figure 2 160 ns

High-level clock pulse width t

øH

CL: Figure 2 160 ns

Low-level clock pulse width t

øL

CL: Figure 2 160 ns

Rise time t

r

CE, CL, DI: Figure 2 160 ns

Fall time t

f

CE, CL, DI: Figure 2 160 ns

INH switching time t

c

INH, CE: Figure 3 10 µs

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

Note: *1 Excluding the bias voltage generation divider resistors built in the V

LCD

1 and V

LCD

2. (See Figure 1.)

No. 4465No. 5800-3/16

LC75874E, 75874W

Parameter Symbol Conditions

Ratings

Unit

min typ max

Hysteresis V

H

CE, CL, DI, INH 0.1 V

DD

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

V

OH

1 S1 to S66: IO= –20 µA V

LCD

– 0.9

Output high-level voltage V

OH

2 COM1 to COM4: IO= –100 µA V

LCD

– 0.9 V

V

OH

3 P1 to P8: IO= –1 mA V

LCD

– 0.9

V

OL

1 S1 to S66: IO= 20 µA 0.9

Output low-level voltage V

OL

2 COM1 to COM4: IO= 100 µA 0.9 V

V

OL

3 P1 to P8: IO= 1 mA 0.9

V

MID

1 COM1 to COM4: 1/2 bias, IO= ±100 µA

1/2 V

LCD

– 1/2 V

LCD

+

0.9 0.9

V

MID

2 S1 to S66: 1/3 bias, IO= ±20 µA

2/3 V

LCD

– 2/3 V

LCD

+

0.9 0.9

Output middle-level voltage*1 V

MID

3 S1 to S66: 1/3 bias, IO= ±20 µA

1/3 V

LCD

– 1/3 V

LCD

+

V

0.9 0.9

V

MID

4 COM1 to COM4: 1/3 bias, IO= ±100 µA

2/3 V

LCD

– 2/3 V

LCD

+

0.9 0.9

V

MID

5 COM1 to COM4: 1/3 bias, IO= ±100 µA

1/3 V

LCD

– 1/3 V

LCD

+

0.9 0.9

Oscillator frequency f

OSC

OSC: R

OSC

= 43 kΩ, C

OSC

= 680 pF 40 50 60 kHz

I

DD

1 V

DD

: Power-saving mode 5

I

DD

2 VDD: VDD= 6.0 V, outputs open, f

OSC

= 50 kHz 230 460

Current drain I

LCD

1 V

LCD

: Power-saving mode 5 µA

I

LCD

2 V

LCD

:

V

LCD

= 6.0 V, outputs open, 1/2 bias, f

OSC

= 50 kHz

200 400

I

LCD

3 V

LCD

:

V

LCD

= 6.0 V, outputs open, 1/3 bias, f

OSC

= 50 kHz

120 240

Electrical Characteristics for the Allowable Operating Ranges

Figure 1

V

LCD

V

LCD

1

V

LCD

2

1. When CL is stopped at the low level

2. When CL is stopped at the high level

Figure 2

Block Diagram

No. 4465-No. 5800-4/16

LC75874E, 75874W

Pin Functions

No. 4465No. 5800-5/16

LC75874E, 75874W

Symbol

Pin No.

Function Active I/O

Handling

LC75874ELC75874W

when unused

1 to 8

9 to 66

79, 80,

1 to 6

7 to 64

67 68 69 70

65 66 67 68

76

74

78

76 79 80

78

77

75

73

71

74

72

71

69 72

70

S1/P1 to S8/P8

S9 to S66

COM1 COM2 COM3 COM4

OSC

CE CL

DI

INH

V

LCD

1

V

LCD

2

V

DD

V

LCD

Segments outputs for displaying the display data transferred by serial data input. The S1/P1 to S8/P8 pins can be used as general-purpose output ports under serial data control.

Common driver outputs. The frame frequency fo is f

OSC

/512 Hz.

Oscillator connection. An oscillator circuit can be formed by connecting an external resistor and capacitor at this pin.

Serial data transfer inputs. Connected to the controller. CE: Chip enable

CL: Synchronization clock DI: Transfer data

Display off control input INH = low (V

SS

)......Display forced off

S1/P1 to S8/P8 = low (V

SS

) (These pins are forcibly set to the segment output port function and held at the V

SS

level.)

S9 to S66 = low (V

SS

)

COM1 to COM4 = low (V

SS

)

INH = high (V

DD

).....Display on

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

Used to apply the LCD drive 2/3 bias voltage externally. Connect this pin to V

LCD

2 when using a 1/2-bias drive scheme.

Used to apply the LCD drive 1/3 bias voltage externally. Connect this pin to V

LCD

1 when using a 1/2-bias drive scheme.

Logic block power supply. In the range 2.7 to 6.0 V. LCD driver block power supply. In the range 2.7 to 6.0 V.

—

H

—

L

—

— —

O

I/O

I I I

I

— —

Open

V

DD

GND

Open

— —

75

73

V

SS

Ground pin. Connect to ground. — — —

Pin Assignments

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