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UM3750M Datasheet(PDF) 1 Page - UMC Corporation |
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UM3750M Datasheet(HTML) 1 Page - UMC Corporation |
1 / 5 page Programmable Encoder/Decoder Single chip contains both Encoder and Decoder. 3V to 11 V operation. On chip oscillator uses non-critical RC components. Cross interference of is virtually eliminated by circuitry which requires 4 valid words to be received, each within 64ms of the other. General Description The UM3750 Encoder/Decode r is a code Transmitter-Receiver system. Working in the trans- mit (encoder) mode, the will sequentially encode and transmit 12 bits of input. Each of the 12 bits may be 1 or 0 to allow 4096 different codes. In the receive (decoder) mode, the incoming signal is compared to the local code a sequential manner Once an error IS detected the system reset and beain its Pin Configurations TX/RX OUTPUT RECEIVER INPUT MODE SELECT “ss INPUT A12 All A10 Schmitt Trigger input provides excellent noise immunity. Applications. alarm control system, security system cordless telephone, remote control. Interfaces with RF, ultrasonic, or infrared modulators I and demodulators comparison on the next word. If all 12 bits are received correctly, a “valid” signal is generated. This signal clears a 64ms counter and triggers a 3-stage counter. The 3-stage counter counts the “valid” pluses and when 4 pulses have been detected, the TX/RX output pin goes low. After the TX/RX output pin goes low, the next “valid” must be received within 128ms, giving a one valid in 6 requirement to keep the TX/RX output pin. TX/RX OUTPUT RECEIVER INPUT MODE SELECT “SS R.C. INPUT A12 All A10 NC 2-3 |
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