HT6221 Datasheet, PDF (1/13 Pages) Holtek Semiconductor Inc – Multi-Purpose Encoders

HT6221/HT6222
Multi-Purpose Encoders
Features
· 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
Applications
· Television and video cassette recorder con-
trollers
· Burglar alarm systems
· Smoke and fire alarm systems
· Garage door controllers
· PPM code method
· Three double-active keys
· Maximum active keys
- _{HT6221: 32 keys}
- _{HT6222: 64 keys}
· Low power and high noise immunity
CMOS technology
· 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.
Block Diagram
X2
X1
The HT6221/HT6222 contain 32 keys
(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.
O s c illa to r
D iv id e r
D a ta S e le c t
& B u ffe r
DOUT
LE D
¸ 2 4 C o u n te r &
S ync.
R1
K e y b o a rd
1 of24 D ecoder
C ir c u it
M a tr ix &
D a ta R O M
G a te
& R e g is te r s
R8
C ir c u it
B in a r y D e te c to r
C1 C8
A IN D 7
VDD VSS
1
March 2, 2000