HT16512

1/4 to 1/11 Duty VFD Controller

Block Diagram

Rev. 1.40

1

May 3, 2005

Features

& 6-digit)

(provides PMOS open-drain and pull-low resistor

output)

Applications

General Description

HT16512 is a VFD (Vacuum Fluorescent Display) con-

troller/driver that is driven on a 1/4 to 1/11 duty factor. It

consists of 11 segment output lines, 6 grid output lines, 5

segment/grid output drive lines, 4 LED output ports, a

control circuit, a display memory, and a key scan circuit.

Serial data inputs to the HT16512 through a three-line

serial interface. This VFD controller/driver is ideal as a

peripheral device for an MCU.

D I

S 6 ~ S 1 0

S e r i a l I / F

C o m m a n d D e c o d e r

D i s p l a y R A M

1 6 - B i t ´ 1 1 W o r d s

T i m i n g G e n e r a t o r

K e y S c a n

4 - B i t

L a t c h

K e y D a t a R A M ( 4 ´ 6 )

O S C

4 - B i t L a t c h

S 0 / K 0 ~

S 5 / K 5

C S

S W 0 ~ S W 3

L E D 0 ~ L E D 3

C L K

D O

O S C

1 6 - B i t

O u t p u t L a t c h

S e g m e n t

D r i v e r

1 6

1 1

K 0 ~ K 3

1 1 - B i t

S h i f t R e g i s t e r

M u l t i p l e x e d

D r i v e r

G r i d

D r i v e r

1 1

6

5

5

D i m m i n g C i r c u i t

D a t a

S e l e c t o r

5

6

5

S 1 1 / G 1 0 ~

S 1 5 / G 6

5

G 0 ~ G 5

6

V D D

V S S

V E E