PT8A9781

The PT8A977B and PT8A9781 provide a complete control functions to the remote-controlled toy. The PT8A9781 has four output pins corresponding with the four actions i.e, forward, backward, right, left. 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 PT8A9781. By adding an external resistor and capacitor conveniently, the oscillator will be constructed. The external resistor and capacitor can adjust the oscillator frequency. The relative error between the frequencies of the two onchip oscillators in the PT8A977B and PT8A9781 must be less than ±25%.