HT6222

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 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 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 HT6221/HT6222 Pin A...