OKI MSC1215-xxRS Datasheet

E2C0022-27-Y3

¡ Semiconductor

This version: Nov. 1997

Previous version: Jul. 1996

MSC1215-xx¡ Semiconductor

MSC1215-xx

¥¥

17

¥ 2 Duplex Driver with Dimming, Keyscan and A/D Converter Function

¥¥

GENERAL DESCRIPTION

The MSC1215-xx is a 1/2-duty vacuum fluorescent display tube driver implemented in BiCMOS technology. This LSI consists of a 37-bit shift register, 34 latches, an analog dimming circuit, (a PWM conversion circuit), a 3¥4 keyscan circuit, a 6ch-6-bit A/D converter and 17 segment drivers, and 2-grid pre-drivers. The MSC1215-xx has capabilities of displaying audio system frequencies and various informations on a VFD tube for the automobile application and also interfacing with keyboard inputs and on an analog volume input. For automobile audio systems, the front panel functions (such as a frequency display, keyboard input and analog voltage input from a volume) can be accomplished by this IC. The analog dimming/PWM conversion modes can be selected automatically for the brightness control, so this IC is applicable to any type of automobile without any change of the specifications. The interface with a MCU can be done only with 3 wires (CS, DATA I/O and CLOCK signals). Also, DATA I/O and CLOCK signal lines can be shared with other peripherals because of chip select function by CS signal.

FEATURES

• Power supply voltage : VDD=8 to 18 V

• Operating temperature range : Ta=–40 to +85°C)

• 17-segment driver outputs (IOH=–5mA at VOH=VDD–0.8 V)

• Built-in analog dimming circuit (6-bit resolution, user-programmable)

• Built-in PWM conversion circuit (Lamp PWM signal to vacuum fluorescent display PWM signal)

• Built-in automatic-selection circuit for analog dimming/PWM conversion function

• Built-in 6ch 6-bit A/D converter

• Built-in 3 ¥ 4 Keyscan circuit

• Built-in oscillation circuit (external R and C, f

• Built-in Power-On-Reset circuit

• Package:

42-pin plastic DIP (DIP 42-P-600-2.54) (Product name: MSM1215-xxRS)

xx indicates the code number.

=3.3 MHz)

OSC

1/22

BLOCK DIAGRAM

MSC1215-xx¡ Semiconductor

SEG1 SEG17

V

DD

GND

PWMOUT

CS

DATA I/O

CLOCK

OSC0

OSC1

VK VD

SW1

Regulator

Timing

OSC

+

-

D/A

P. O. R

5V

17 Segment

VF Tube Driver

34Æ17 Segment Control

bit 34-18

(Grid2)

L

D

34-bit Latch

bit34 bit1

34-bit Shift Register

R

Timing Generator

MUX Latch PWM

Select

Logarithm Counter

bit 17-1

(Grid1)

Grid

Pre-driver

3-bit

Latch

3-bit

S/R

Test

SW1 (VF Data) SW2 (Keyscan) SW3 (A/D)

Mode

Select

Test1-8

GRID1 GRID2

to PWM OUT

SW2

Read Enable "H"at SW2 ON

Decoder

De-glitch PWM detector Look up table

SI

12-bit Presetable S/R

out

Set S S PE

444

4-bit

LLL

Latch

444

Timing

Generator

Row Col

321 3214

Detector

With 100kW pull-up resistor

6-bit dig. comp.

+

-

"H" at SW3 ON Read Eable

Timing

Generator

PE

O

SW3

CH1 CH2 CH3 CH4 CH5 CH6

V

REF

Channel

Select

V

REF

6ch 6-bit

A/D

& Logic

36-bit S/R

2/22

INPUT AND OUTPUT CONFIGURATION

GND

(5V Reg.)

V

DD

GND

DATAI/O

GND

(5V Reg.)

GND

• Schematic Diagrams of Logic Portion Input Circuit 1

MSC1215-xx¡ Semiconductor

INPUT

V

DD

GND

(5V Reg.)

GND

• Schematic Diagrams of Logic Portion Input

Circuit 2

V

DD

(5V Reg.)

• Schematic Diagrams of Logic Portion Input/ Output Circuit

COLn

GND

• Schematic Diagrams of Logic Portion Output Circuit

(5V Reg.)

OUTPUT

• Schematic Diagrams of Driver Output Circuit

V

DD

V

DD

OUTPUT

GND

3/22

PIN CONFIGURATION (TOP VIEW)

MSC1215-xx¡ Semiconductor

COL4

GRID1 GRID2

SEG 1

SEG 2 5

SEG 3 6

SEG 4

SEG 5

SEG 9 9 CH334

SEG10 10

SEG11 11 CH132

SEG12

SEG13

SEG14 15 VK28

SEG15 16 DATA I/O

1 COL3

2 COL2

3

4

7

8

VDD12 GND31

13

14

42

41

40

39

38

37

33

27

COL1

VD

V

REF

CH6

CH536

CH435

CH2

OSC030

OSC129

SEG16 17 CS26

SEG17 18 CLOCK25

SEG 6 19 ROW 1

SEG 7 20 ROW 2

SEG 8

21 ROW 322

24

23

42-Pin Plastic DIP

4/22

ABSOLUTE MAXIMUM RATINGS

MSC1215-xx¡ Semiconductor

Parameter

Supply Voltage

Input Voltage (1)

Input Voltage (2)

Power Dissipation

Storage Temperature

Symbol Condition Rating Unit

T

V

DD

IN1

IN2

P

STG

All inputs except VK

D

—

VK

Ta=85°C

— –55 to +150

RECOMMENDED OPERATING CONDITION

Parameter

Supply Voltage

Operating Temperature

High Level Input Voltage (1)

High Level Input Voltage (2)

Low Level Input Voltage

Clock Frequency

OSC Frequency

Frame Frequency 200f

Symbol Typ. Unit

V

DD

T

OP

V

IH1

V

IH2

V

IL

f

c

f

osc

FR

Condition

—

All inputs except VK

VK

All inputs

—

R=4.7 kW, C=10 pF

–0.3 to +20 V

–0.3 to +6

–0.3 to +V

400

DD

V

mW

°C

Min.

8

–40

3.8

0

—

3.33

Max.

18

85

5.5

V

DD

0.8

250

—

V

°C

V

kHz

MHz

——Hz—

5/22

ELECTRICAL CHARACTERISTICS

DC Characteristics

Parameter

"H" Input Voltage

"L" Input Voltage

"H" Input Current (1)

"H" Input Current (2)

"L" Input Current (1)

"L" Input Current (2) "H" Output Voltage (1)

"H" Output Voltage (2) V

Symbol Min. Unit

V

IH

V

IL

I

IH1

I

IH2

I

IL1

I

IL2

V

OH1

OH2

Condition

All inputs except VD

All inputs except COL1-4

=4.4 V

V

IN

COL1-4, V

=3.8 V

IN

All inputs except COL1-4

VIN=0 V

COL1-4, VIN=0 V

SEG, GRID

=–5 mA, VDD=9.5 V

I

OH1

DATA I/O, V

I

OH2

=9.5 V

DD

=–200 mA

Output open

MSC1215-xx¡ Semiconductor

(Ta=–40 to +85°C, V

Max.

3.8 V

—

–5

–70

–5

–160

V

-0.8

DD

4

4.5

=8 to 18V)

DD

—

0.8

5

–5

5

–10

—

— —

V

mA

V

V V

"L" Output Voltage (1)

"L" Output Voltage (2)

Current Consumption

V

OL1

V

OL2

DD

SEG,GRID, V

I

OL1

I

OL1

I

OL1

DATA I/O, ROW1-3

=9.5 V, I

V

DD

=3.3 MHz, no loadI

f

osc

DD

=500 mA =200 mA

=2 mA

=200 mA

OL2

=9.5 V

— — —

—

2 1

0.3

0.8

20

V V V

V

mA

6/22

Switching Characteristics

Parameter

Oscillation Frequency f

Clock Frequency

Clock Pulse Width

Data Set-up Time

Data Hold Time

CS Pulse Width

CS Off Time

CS Pulse Width t

CS Off Time

CS Set-up Time CS-clock Time

CS Hold Time Clock-CS Time

DATA Output Delay CLCOK-DATA Out Time

Symbol Min. Unit

osc

f

t

cw

t

DS

t

DH

t

CSW

t

CSL

RCSW

t

RCSL

t

CSS

t

CSH

t

PD

MSC1215-xx¡ Semiconductor

(Ta=–40 to +85°C, V

Condition

— MHz4.52

c

—

Except reset mode

—

1.3

1

200

8

32

Reset mode 4

Reset mode

—

4

2

—

=8 to 18 V)

DD

Max.

250

—

— ms

—

1

kHz

ms

ns

ms

SEG & GRID Outputs Delay

t

ODS

CL=100 pF

Time from CS

Slew Rate (All Drivers)

t

R

=100 pF

C

L

t=20% to 80% or

80% to 20% of V

Power on Timing —

t

PCS

DD

—

300

—

8

5

ms

7/22