Holtek HT622xA系列红外线遥控方案
Holtek 公司的HT622xA系列红外线遥控器IC,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
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