UTCRCT02

The UTCRCT02 can be used with the decoder RCR02 to provide a complete control functions to the remote-controlled toy. The RCT02 has five input pins corresponding with the five function buttons i.e, forward, backward, rightward, leftward and turbo. The encoding circuit in the RCT02 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 of UTCRCT02 are used in wireless and infra-red applications respectively. There is an internal oscillator in the RCT02. By adding an external resistor conveniently, the oscillator will be constructed. The oscillator frequency can be adjusted by the external resistor. The relative error between the frequencies of the two on chip oscillators in the RCT02 and RCR02 must be less than ±25%. The auto-power-off function is achieved by an internal counter.

When the UTCRCT02 is powered on, the counter is reset and begin to count. Any action of push down or release the function button also reset the counter. The PC pin will keep on a high level until the counter counts up to about 4 minutes. The PC output is used to control on/off state of the external power supply. Pressing OFF button can also shut down the power supply. Press on any function button will wake up the chip promptly.