HT16561 datasheet(1/9 Pages) HOLTEK

Part #	HT16561

Description	VFD Digital Clock

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

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HT16561

VFD Digital Clock

Block Diagram

Rev. 1.00

1

February 7, 2007

Features

· VFD display 12 hour clock function

· 4.194304MHz crystal oscillation

· Zero adjust function

· Integrated voltage regulator permits wide 4V to 16V

operating voltage range

· Four level contrast control function

· 44-pin QFP package

General Description

The HT16561 provides direct drive to VFD panels to im-

plement a 12 hour clock function. In addition to obtaining

its time base from a 4.194304MHz crystal oscillation

source and in having a wide operating voltage, the de-

vice also contains a host of other features. These in-

clude a choice of adjustment modes, including single

push increment or 2Hz fast forward functions. Additional

features are provided in the form of Zero adjustment and

four levels of contrast control.

O s c i l l a t o r

O S C I

O S C O

V D D

T e s t

A d j u s t m e n t

T E S T 3

T E S T 2

T E S T 1

V D D

A / C

S E

Z A

M S

H S

C o n t r a s t

A d j u s t m e n t

V D D

C O N T 2

C O N T 1

D I M

V D D

T E S T 4

F r e q u e n c y D i v i d e r s

6 4 H z

1 H z

S e c o n d C o u n t e r

( 1 / 6 0 )

M i n u t e C o u n t e r

( 1 / 6 0 )

H o u r C o u n t e r

( 1 / 1 2 )

D e c o d e r

S e g m e n t

A M / P M

D e c o d e r

S e g m e n t

C M O S

1 H z

a 1

b 1

c 1

g 3

b 4

c 4

A M

P M

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