HT16511

1/8 to 1/16 Duty VFD Controller

Block Diagram

Rev. 1.10

1

September 18, 2003

Features

(12-segment & 16-digit to 20-segment & 8-digit)

(provides PMOS open-drain and pull-low resistor

output)

Applications

General Description

HT16511 is a VFD (Vacuum Fluorescent Display) con-

troller/driver that is driven on a 1/8 to 1/16 duty factor. It

consists of 12 segment output lines, 8 grid output lines,

8 segment/grid output drive lines, 5 LED output ports, a

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

Serial data inputs to the HT16511 through a three-line

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

peripheral device for an MCU.

D I

S e r i a l I / F

D i s p l a y R A M

2 0 - B i t ´ 1 6 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 ´ 1 2 )

O S C

5 - B i t L a t c h

S 1 / K 1 ~

S 1 2 / K 1 2

S W 0 ~ S W 3

L E D 0 ~ L E D 4

C S

C L K

D O

O S C

2 0 - 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

2 0

1 2

K 0 ~ K 3

1 6 - 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 6

8

8

8

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

8

1 2

S 1 3 / G 1 6 ~

S 2 0 / G 6

8

G 1 ~ G 8

8

V D D

V S S

V E E

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