Document
HT6220A/HT6221A/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 - HT6222A: 64 keys · Low power and high noise immunity CMOS
technology
· HT6220A: 16-pin NSOP package
HT6221A: 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 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 HT6220A/HT6221A/HT6222A contain 30keys (K1~K16, K17~K20, K33~K34, K37~K38, K41~K42, K45~K46, K49~K50), 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
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O s c illa to r
D iv id e r
D a ta S e le c t & B u ffe r S y n c . C ir c u it
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
Rev. 1.00
1
July 27, 2009
HT6220A/HT6221A/HT6222A
Pin Assignment
R 3 R 4 R 1 1 2 3 4 5 6 7 8 9 1 0 R 2 R 3 1 2 3 4 5 6 7 8 H T 6 2 2 0 A 1 6 N S O P -A R 4 R 5 R 6 D O U T V D D D 7 V S S 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 R 2 R 1 A IN C 1 C 2 C 3 C 4 C 5 R 3 R 4 D O U T V D D D 7 N C N C V S S 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 H T 6 2 2 1 A 2 0 S O P -A A IN C 1 C 2 C 3 C 4 C 5 C 6 C 7 C 8 L E D R 5 R 6 R 7 R 8 D O U T V D D D 7 N C N C V S S 9 1 0 1 1 1 2 8 7 6 5 4 3 2 1 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 H T 6 2 2 2 A 2 4 S O P -A R 2 R 1 A IN C 1 C 2 C 3 C 4 C 5 C 6 C 7 C 8 L E D
Pin Description
HT6222A Pin No. 1~6 7 8 9 10, 11 12 13 14~21 22 23~24 Pin Name R3~R8 DOUT VDD D7 NC VSS LED C8~C1 AIN R1~R2 I/O I O ¾ I ¾ ¾ O I/O I I Internal Connection CMOS IN, Pull-low NMOS OUT ¾ CMOS IN ¾ ¾ CMOS OUT Description Row control for keyboard matrix, active high Serial data output pin, with a 38kHz carrier Positive power supply, 2.0V~3.6V for normal operation Most significant data bit (D7) code setting No connection Negative power supply, ground Transmission enable indicator output
CMOS IN/OUT, Pull-low Column control for keyboard matrix CMOS IN, Pull-high Pull-low CMOS IN, Pull-low Low byte address codes (8 bits) scan input Row control for keyboard matrix, active high
Approximate Internal Connection.