MSC1200V-01 データシートの表示（PDF） - Oki Electric Industry

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MSC1200V-01

30-Bit Duplex Controller/Driver with Digital/Analog Dimming and Keyscan Functions

Oki Electric Industry 

¡ Semiconductor

FEDL1200V-03

MSC1200-01/1200V-01

PIN DESCRIPTIONS

Pin

Symbol Type

Description

1

VDD

— Power Supply

Day/night switching pin. When the high level is input, the IC enters the night

2

VPARK

I

mode and the value determined by the analog or digital dimming circuit is

used as the output duty. When the low level is input, the IC enters the day

mode and the output duty is about 100%.

Analog voltage input for determining the analog dimming value.

3

VDIM

I

When the analog dimming circuit is used, the output duty is determined by

the analog voltage to be input to this pin.

When only the digital dimming circuit is used, pull down this pin to GND.

Chip select input. Only when the high level is input to this pin, interfacing

4

CS

I

with a microcomputer is available through "CLOCK" and "DATA I/O" pins.

Therefore, 2 signal lines of "CLOCK" and "DATA I/O" can be shared with other

peripherals.

5

CLOCK

I

Serial clock input. Data is input-output through "DATA I/O" pin at the rising

edge of the serial clock.

6

DATA I/O

I/O

Serial data input-output. This pin enters output mode only when the keyscan

mode is selected. It enters input mode when other mode is selected.

Interrupt signal output to microcomputer. When any key is pressed or

7

INT

O

released, key scanning is started. After the completion of the one cycle, this

pin goes to the high level and keeps the high level until keyscan stop mode is

selected.

Test signal input. As this pin has a built-in pull-up resistor, it must be left

8

TEST1

I

open or pulled up in the normal operation mode. When the low level is input

to this pin, SEG1-30 go to the high level, and GRID1 and GRID2 go to the

low level. (All segments go on.)

Serial data output. Selecting this pin specifies the MSC1200V-01. The data

DATA OUT

from DATA I/O is shifted out on the rising edge of the shift clock with a delay

9

(Option)

O of 64 bits in the shift register. This pin can be used for connecting the IC with

a LED driver in series.

When the VPARK pin is at the high level, the pulse with the duty ratio determin-

ed by the analog or digital dimming circuit is output through this pin. When

9

PWM OUT/

BLANK IN

(Option)

this pin is at the low level, the pulse with the duty ratio determined by external

I/O

circuit is input to this pin. This pin has an internal active pull-up resistor,

which becomes active only when the VPARK pin is at the low level. When the

VPARK pin is at the low level, this pin receives blanking signal from external

circuits, so that output duty cycle can be controlled. Selecting this pin speci-

fies the MSC1200-01.

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