HT8A978B

HT8A977B/978B 5-Function Remote Controller Description The HT8A977B and HT8A978B provide complete control functions to the remote-controlled toy. The HT8A977B has five input pins corresponding with the five function buttons i.e, forward, backward, rightward, leftward and turbo. The encoding circuit in the HT8A977B sends digital codes to the two output pins SO and SC. The digital codes correspond to the definite function buttons or their combinations. The SO and SC outputs are used in wireless and infra-red applications respectively. The HT8A978B has five output pins corresponding with the five actions. The received signals are amplified by the three-stage amplifier, and then the appropriate amplified signals are sampled, fault-tolerantly checked and decoded to control the actions of the remote-controlled toy. There is an internal oscillator in the HT8A977B and 978B respectively. By adding an external resistor conveniently, the oscillator will be constructed. The oscillator frequency c...