HT16515

1/4 to 1/12 Duty VFD Controller

Block Diagram

Rev. 1.00

1

December 19, 2003

Features

(16-segment & 12-digit to 24-segment & 4-digit)

(provides PMOS open-drain and pull-low resistor

output)

Applications

General Description

HT16515 is a VFD (Vacuum Fluorescent Display) con-

troller/driver that is driven on a 1/4 to 1/12 duty factor. It

consists of 16 segment output lines, 4 grid output lines,

8 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 HT16515 through a three-line

serial interface. This VFD controller/driver is an ideal

MCU peripheral device.

D I

S e r i a l I / F

D i s p l a y R A M

2 4 - B i t ´ 1 2 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

K e y D a t a M e m o r y

( 2 ´ 1 6 )

O S C

4 - B i t L a t c h

S e g 1 / K S 1

L E D 0 ~ L E D 3

C S

C L K

D O

O S C

2 4 - 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 4

1 6

K e y 0 ~ K e y 1

1 2 - 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 2

4

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

V D D

V S S

V E E

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

S e g 1 6 / K S 1 6

S e g 1 7 / G r i d 1 2

S e g 2 4 / G r i d 5

G r i d 1

G r i d 4