HT6220A Datasheet, PDF (1/19 Pages) Holtek Semiconductor Inc – Multi-Purpose Encoders

HT6220A/HT6221A/HT6221B/HT6222A
Multi-Purpose Encoders
Features
· Operating voltage: 2.0V~3.6V
· DOUT with 38kHz carrier for IR medium
· Low standby current
· Minimum transmission word: one word
· Build-in RC (Internal RC) oscillator
· 16-bit address codes
· 8-bit data codes
· PPM code method
· Three double-active keys
· Maximum active keys
- HT6220A: 30 keys
- HT6221A: 32 keys
- HT6221B: 48 keys
- HT6222A: 64 keys
· Low power and high noise immunity CMOS
technology
· HT6220A: 16-pin NSOP package
HT6221A/HT6221B: 20-pin SOP package
HT6222A: 24-pin SOP package
Applications
· Television , setup box and DVD player 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 devices are CMOS LSI encoders designed for use
in remote control systems. They are capable of encod-
ing 16-bit address codes and 8-bit data codes. Each ad-
dress/data input can be set to one of the two logic
states, 0 and 1.
The HT6220A/HT6221A/HT6221B/HT6222A contain
30keys (K1~K20, K33~K34, K37~K38, K41~K42,
K45~K46, K49~K50), 32 keys (K1~K32), 48 keys
(K1~K32, K33~K34, K37~K38, K41~K42, K45~K46,
K49~K50, K53~K54, K57~K58, K61~K62) and 64 keys
(K1~K64), respectively. When one of the keys is trig-
gered, the programmed address/data is transmitted to-
gether with the header bits via an IR (38kHz carrier)
transmission medium.
Block Diagram
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
Rev. 1.10
1
June 1, 2010