SANYO LC75844M Datasheet

Ordering number : ENN6235

92299TH (OT) No. 6235-1/14

Overview

The LC75844M is a 1/4 duty general-purpose LCD driver that can be used for frequency display in electronic tuners under the control of a microcontroller. The LC75844M can drive an LCD with up to 88 segments directly. The LC75844M can also control up to 4 general-purpose output ports. Since the LC75844M uses 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 volts, 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 of up to 88 segments under serial data control.

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

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

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

• High generality, since display data is displayed directly without decoder intervention.

• Independent V

LCD

for the LCD driver block (V

LCD

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

• The INH pin can force the display to the off state.

• RC oscillator circuit

Package Dimensions

unit: mm

3204-MFP36S

0.15

15.3

1

18

36 19

0.850.35 0.8

2.5max

2.15

0.1

7.9

9.2

10.5

0.65

SANYO: MFP36S

[LC75844M]

LC75844M

SANYO Electric Co.,Ltd. Semiconductor Company

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

1/4 Duty General-Purpose LCD Driver

CMOS IC

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

• CCB is a trademark of SANYO ELECTRIC CO., LTD.

• CCB is a SANYO’s original bus format and all the bus addresses are controlled by SANYO.

Pin Assignment

No. 6235-2/14

LC75844M

P1/S1

P2/S2DIP3/S3CLP4/S4

CES5INHS6OSCS7V

SS

S8

V

LCD

2

S9

V

LCD

1

V

LCD

S10 VDDS11 COM4

S12 COM3

S13 COM2

S14 COM1

S15 S22

S16 S21

S17 S20

S18 S19

LC75844M

A12595

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 +7.0 V

V

LCD

max V

LCD

–0.3 to +7.0 V

V

IN

1 CE, CL, DI, INH –0.3 to +7.0 V

Input voltage V

IN

2 OSC –0.3 to VDD+ 0.3 V

V

IN

3V

LCD

1, V

LCD

2 –0.3 to V

LCD

+ 0.3 V

Output voltage

V

OUT

1 OSC –0.3 to VDD+ 0.3 V

V

OUT

2 S1 to S22, COM1 to COM4, P1 to P4 –0.3 to V

LCD

+ 0.3 V

I

OUT

1 S1 to S22 300 µA

Output current I

OUT

2 COM1 to COM4 3 mA

I

OUT

3 P1 to P4 5 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

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

Parameter Symbol Conditions

Ratings

Unit

min typ max

Supply voltage

V

DD

V

DD

2.7 6.0 V

V

LCD

V

LCD

2.7 6.0 V

Input voltage

V

LCD

1V

LCD

1 2/3 V

LCD

V

LCD

V

LCD

2V

LCD

2 1/3 V

LCD

V

LCD

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 43 kΩ

Recommended external capacitance C

OSC

OSC 680 pF

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

Top view

No. 6235-3/14

LC75844M

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 S22; IO= –20 µA V

LCD

– 0.9 V

Output high level voltage V

OH

2 COM1 to COM4; IO= –100 µA V

LCD

– 0.9 V

V

OH

3 P1 to P4; IO= –1 mA V

LCD

– 0.9 V

V

OL

1 S1 to S22; IO= 20 µA 0.9 V

Output low level voltage V

OL

2 COM1 to COM4; IO= 100 µA 0.9 V

V

OL

3 P1 to P4; IO= 1 mA 0.9 V

V

MID

1

COM1 to COM4; 1/2 bias,

1/2 V

LCD

– 0.9 1/2 V

LCD

+ 0.9 V

I

O

= ±100 µA

V

MID

2

S1 to S22; 1/3 bias,

2/3 V

LCD

– 0.9 2/3 V

LCD

+ 0.9 V

I

O

= ±20 µA

Output middle level voltage*

1

V

MID

3

S1 to S22; 1/3 bias,

1/3 V

LCD

– 0.9 1/3 V

LCD

+ 0.9 V

I

O

= ±20 µA

V

MID

4

COM1 to COM4; 1/3 bias,

2/3 V

LCD

– 0.9 2/3 V

LCD

+ 0.9 V

I

O

= ±100 µA

V

MID

5

COM1 to COM4; 1/3 bias,

1/3 V

LCD

– 0.9 1/3 V

LCD

+ 0.9 V

I

O

= ±100 µA

Oscillator frequency f

OSC

OSC; R

OSC

= 43 kΩ, C

OSC

= 680 pF 40 50 60 kHz

I

DD

1VDD; power saving mode 5 µA

I

DD

2VDD; VDD= 6.0 V, output open, fosc = 50 k Hz 230 460 µA

I

LCD

1V

LCD

; power saving mode 5 µA

Current drain

I

LCD

2

V

LCD

; V

LCD

= 6.0 V, output open

100 200 µA

1/2 bias, fosc = 50 k Hz

I

LCD

3

V

LCD

; V

LCD

= 6.0 V, output open

60 120 µA

1/3 bias, fosc = 50 k Hz

Electrical Characteristics for the Allowable Operating Ranges

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

LCD

1 and V

LCD

2. (See Figure 1.)

V

LCD

1

V

LCD

2

V

LCD

V

SS

A06588

To the common segments driver

Except these resistors

s

Figure 1

No. 6235-4/14

LC75844M

Figure 2

Block Diagram

tøL tøH

tf tr

tds tdh

tcp tcs

tch

V

IL

V

IH

V

IH

V

IH

V

IL

V

IL

50%

CL

CE

DI

A12598

2. When CL is stopped at the high level

COMMON

DRIVER

ADDRESS

DETECTOR

CLOCK

GENERATOR

SEGMENT DRIVER & LATCH

SHIFT REGISTER

INH

OSC

V

DD

V

LCD

V

LCD

1

V

LCD

2

V

SS

DI

CL

CE

COM4

COM3

COM2

COM1

S22

S21

S2/P2

S3/P3

S4/P4S5S1/P1

A12599

tøH tøL

tr tf

tds tdh

tcp tcs

tch

V

IL

V

IH

V

IH

V

IH

V

IL

V

IL

50%

CL

CE

DI

A12597

1. When CL is stopped at the low level

Pin Functions

No. 6235-5/14

LC75844M

CE: Chip enable CL: Synchronization clock DI: Transfer data

H

—

S1/P1 to

S4/P4

S5 to S22

1 to 4

5 to 22

— O Open

Segment outputs for displaying the display data transferred by serial data input. The pins S1/P1 to S4/P4 can be used as general-purpose output ports when so set up by the control data.

COM1 COM2 COM3 COM4

23 24 25 26

— O Open

Common driver outputs. The frame frequency f

O

is given by: fO= (f

OSC

/512) Hz.

OSC

32

CE CL

DI

34 35 36

Serial data transfer inputs. These pins are connected to the control microprocessor.

—

I/O

V

DD

I GND

Oscillator connection An oscillator circuit is formed by connecting an external resistor and capacitor to this pin.

V

LCD

1

29 — I Open

Used to apply the LCD drive 2/3 bias voltage externally. This pin must be connected to V

LCD

2 when 1/2 bias drive is used.

V

LCD

2

30 — I Open

Used to apply the LCD drive 1/3 bias voltage externally. This pin must be connected to V

LCD

1 when 1/2 bias drive is used.

V

DD

27 —— —Logic block power supply. Provide a voltage in the range 2.7 to 6.0 V.

V

LCD

28 —— —LCD driver block power supply. Provide a voltage in the range 2.7 to 6.0 V.

V

SS

31 —— —Ground pin. Connect to ground.

INH 33 L I GND

Display off control input

•INH = low (V

SS

): Off

S1/P1 to S4/P4 = Low (These pins are forcibly set to the segment output port function and fixed at the V

SS

level.)

S5 to S22 = Low (V

SS

),

COM1 to COM4 = Low (V

SS

)

•INH = high (V

DD

): On Note that serial data transfers can be performed when the display is forced off by this pin.

Active I/O

Handling

when unused

FunctionPin No.

Serial Data Transfer Format

1. When CL is stopped at the low level

Note: DD ... Direction data

CE

CL

DI

A12600

00100010

B0 B1 B2 B3 A0 A1 A2 A3

D1D2D3 D37D38D39D40D41D42D43D4400000P0P1P2DRSCBU0

00100010

B0 B1 B2 B3 A0 A1 A2 A3

D45D46D47 D81D82D83D84D85D86D87D88000000000001

CCB address

8 bits

CCB address

8 bits

Display data

44 bits

Display data

44 bits

Control data

11 bits

Fixed data

11 bits

DD

1 bit

DD

1 bit