HT6221/HT6222
Multi-Purpose Encoders
Features
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Operating voltage: 1.8V~3.5V
DOUT with 38kHz carrier for IR medium
Low standby current
Minimum transmission word: one word
455kHz ceramic resonator or crystal
16-bit address codes
8-bit data codes
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PPM code method
Three double-active keys
Maximum active keys
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HT6221: 32 keys
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HT6222: 64 keys
Low power and high noise immunity
CMOS technology
Applications
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Television and video cassette recorder con-
trollers
Burglar alarm systems
Smoke and fire alarm systems
Garage door controllers
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Car door controllers
Car alarm systems
Security systems
Other remote control systems
General Description
The HT6221/HT6222 are CMOS LSI encoders
designed for use in remote control systems. They
are capable of encoding 16-bit address codes and
8-bit data codes. Each address/data input can be
set to one of the two logic states, 0 and 1.
The HT 6 2 2 1/H T622 2 c on tai n 32 k ey s
(K1~K32) and 64 keys (K1~K64), respectively.
When one of the keys is triggered, the pro-
grammed address/data is transmitted together
with the header bits via an IR (38kHz carrier)
transmission medium.
Block Diagram
X 2
X 1
D a ta S e le c t
& B u ffe r
S y n c .
C ir c u it
O s c illa to r
D iv id e r
D O U T
L E D
R 1
R 8
K e y b o a rd
M a tr ix &
G a te
C ir c u it
D a ta R O M
& R e g is te r s
¸
2 4 C o u n te r &
1 o f 2 4 D e c o d e r
B in a r y D e te c to r
C 1
C 8
A IN
D 7
V D D
V S S
1
March 2, 2000
This Material Copyrighted By Its Respective Manufacturer
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
