HoltekHT622xA系列红外线遥控方案

Holtek 公司的HT622xA系列红外线遥控器,采用内建OSC电路及红外线LED驱动MOSFET,比传统红外线遥控器IC节省许多的外部零件, 工作电压2.0V-3.6V,待机静态电流小于1uA,载波频率为38kHz,采用脉冲位置调制方法,透过红外线LED发码,内含16位位置码及8位数据码, HT6220A/HT6221A/HT6222A分别支持30/32/64按键输入。广泛使用于各种遥控器如电视机、机上盒、DVD播放机、音响、小家电等。本文介绍HT622xA系列主要特性, 方框图以及HT6220A,HT6221A和HT6222A应用电路.
  
  The devices HT622xA 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.
  
  HT622x主要特性:
  
  _ 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
  
  HT622x应用:
  
  _ 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
  
  图1.HT622x方框图
  
  图2.HT6220A 应用电路
  
  图3.HT6221A 应用电路
  
  图4.HT6222A 应用电路