HT16565B(2007) Просмотр технического описания (PDF) - Holtek Semiconductor

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HT16565B
(Rev.:2007)

24 Hour System VFD Digital Clock

Holtek Semiconductor 

HT16565

24 Hour System VFD Digital Clock

Features

· VFD display 24 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 HT16565 provides direct drive to VFD panels to im-

plement a 24 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.

Block Diagram

O SCO

O SCI

O s c illa to r

V DD

F r e q u e n c y D iv id e r s 1 H z

CM OS

64H z

1H z

TEST3

TEST2

TEST1

A /C

SE

ZA

MS

HS

T est

A d ju s tm e n t

V DD V DD

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

a1

b1

c1

M in u te C o u n te r

D ecoder

S egm ent

H o u r C o u n te r

D ecoder

S egm ent

C O N T2

C O N T1

D IM

V DD

C o n tra s t

A d ju s tm e n t

g3

b4

c4

a4,d4

e4,g4

TEST4

S 1224

V DD

V DD

Rev. 1.00

1

February 7, 2007

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