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. There is an internal oscillator in the HT8A977B and 978B respectively. The oscillator frequency can be adjusted by the external resistor. The relative error between the frequencies of the two on-chip oscillators in the HT8A977B and HT8A978B must be less than ±25%. The auto-power-off function is achieved by an internal counter (977B). The PC output is used to control on/off state of the external power supply. Press on any function button will wake up the chip promptly. FEATURES
● HT8A977B works as en...
HOTCHIP
