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HV5812

20-Channel Serial-Input Vacuum Fluorescent Display Driver for Anode or Grid

Microchip Technology 

HV5812

3.0 FUNCTIONAL DESCRIPTION

Follow the steps below to power up and power down

the HV5812:

POWER-UP AND POWER-DOWN SEQUENCE

Power-up

Step

Description

Step

1 Connect ground.

1

2 Apply VDD.

2

3 Set all inputs (Data, CLK, etc.) to a known state

3

4 Apply VPP. (Note 1)

4

Note 1: The VPP should not drop below VDD during operation.

Power-down

Description

Remove VPP.

Remove all inputs.

Remove VDD.

Disconnect ground.

FUNCTION TABLE (Note 1)

,

Serial

Data

Input

Clock

Input

Shift Register Contents

I1 I2 I3... IN-1

IN

H L to H H R1 R2...RN–2 RN–1

L L to H L R1 R2...RN–2 RN–1

X H to L R1 R2 R3...RN–1 RN

—

— XX

X...X

X

—

— P1 P2 P3...PN–1

PN

—

— ——

—

—

Note 1:

L = Low logic level

H = High logic level

X = Irrelevant 

P = Present state

R = Previous state

Serial

Data

Output

Strobe

Input

I1

RN–1

RN–1

RN

X

PN

—

——

——

——

L

R1

H

P1

—X

Latch Contents

Output Contents

Blanking

I2 I3... IN-1 IN

I1 I2 I3... IN-1 IN

—

—

—

—

——

—

—

—

—

—

—

——

—

—

—

—

—

—

——

—

—

R2 R3...RN–1 RN

—

——

—

—

P2 P3...PN–1 PN

L

P1 P2 P3...PN–1 PN

X

X...X

X

H

LL

L...L

L

VDD

INPUT

VDD

VPP

L/T

Data Out

HVOUT

GND

Logic Inputs

FIGURE 3-1:

IO Circuits.

GND

Logic Data Output

GND

High Voltage Outputs

 2016 Microchip Technology Inc.

DS20005629A-page 7

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