HT13R90在简易充电器中的应用:本产品为简易镍氢电池充电器，可充AA、AAA 两种型号的电池。充电器只有定时功能，电源启动便开始计时，直到定时时间结束自动停止充电 (充电指示灯熄灭)。HT13R90特征简介• Operating voltage: 2.2V~5.5V• 40-bit programmable timer (max. over one year timer)• 3 kinds of operating modes (continuous mode, one period mode and one pulse mode)• One timer output• Two LED or Buzzer output for indicating status• Adjustable 5% internal RC or 32768Hz crystal• Oscillator with quickly startup circuit (need to automatically turn off for powersaving issue)• Option OTP 22×4 bits for mode setting• 8-pin DIP/SOP package