LC7573NM データシートの表示（PDF） - SANYO -> Panasonic

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LC7573NM

1/2 Duty VFD Driver for Frequency Display

SANYO -> Panasonic 

LC7573N, 7573NM

Pin Functions

Pin No.

1

2

5

3

4

7

8

9

6

30, 29

28 to 10

Pin

VFL

VDD

VSS

OSC

BLK

CL

DI

CE

DIM

G1, G2

S1 to S19

I/O

Function

— Driver block power supply. A voltage of between 8.0 and 18.0 V must be supplied.

— Logic block power supply. A voltage of between 4.5 and 5.5 V must be supplied.

— Ground. Must be connected to the system ground.

I/O

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

to this pin.

Display off control input

I

BLK = low (VSS): Display off (G1 and G2 = low)

BLK = high (VDD): Display on

Note that serial data can be transferred while the display is turned off.

I

Serial data transfer inputs. These pins must be

connected to the system controller.

CL: synchronization clock

DI: transfer data

CE: chip enable

When the analog dimmer is selected, the analog voltage applied to this pin controls the duty of the G1

and G2 digit output pins. Since a 6-bit A/D converter is applied to this analog voltage and that result is

I input to a decoder that provides a built-in dimmer curve, the relationship between the analog voltage

and the duty can be specified as a mask program. Note that 63/96 · VDD is the full-scale level for the

6-bit A/D converter.

O Digit outputs. The frame frequency fO is (fOSC/4096) Hz

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

Handling

when unused

—

—

—

VDD

GND

GND

GND

Open

Open

Serial Data Transfer Format

1. When CL is stopped at the low level

2. When CL is stopped at the high level

Figure 2

No. 3587-4/10

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