HT6221_07 Datasheet, PDF (1/15 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
· PPM code method
· Three double-active keys
· Maximum active keys
- HT6221: 32 keys
- HT6222: 64 keys
· Low power and high noise immunity CMOS
technology
· HT6221: 20-pin SOP package
HT6222: 24-pin SOP package
Applications
· Television and video cassette recorder controllers
· Burglar alarm systems
· Smoke and fire alarm systems
· Garage door controllers
· 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 HT6221/HT6222 contain 32 keys (K1~K32) and 64
keys (K1~K64), respectively. When one of the keys is
triggered, the programmed address/data is transmitted
together with the header bits via an IR (38kHz carrier)
transmission medium.
Block Diagram
R1
R8
X2
X1
O s c illa to r
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
D iv id e r
¸ 2 4 C o u n te r &
1 of24 D ecoder
B in a r y D e te c to r
D a ta S e le c t
& B u ffe r
S ync.
C ir c u it
DOUT
LE D
C1 C8
A IN D 7
VDD VSS
Rev. 1.50
1
October 1, 2007