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SC2128A-C40S Datasheet(PDF) 11 Page - Silan Microelectronics Joint-stock |
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SC2128A-C40S Datasheet(HTML) 11 Page - Silan Microelectronics Joint-stock |
11 / 15 page Silan Semiconductors SC2128A HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2000.12.31 11 the final adjustments, regardless the adjustments are made from panel key or from remote control handset. One exception is the SLEEP key available on the remote control handset. SLEEP key start or adjusts the fan to the default sleep settings. Regardless the fan is started by SPEED or by MEMS, SLEEP key does not affect the operation memory. 14. BUZZER OUTPUT All valid key pressed except OFF/MEMS initiates a 150ms duration 4kHz 50% duty cycle pulse train at OFF/MEMS/BUZZ pin. OFF/MEMS key function as OFF key if pressed when fan is in any on state. In this case, it does NOT initiate an output on BUZZ. OFF/MEMS key functions as MEMORY-START key if pressed when fan is in off state. In this case, it DOES initiate a 150ms duration 4kHz 50% duty cycle pulse train on BUZZ. Note that when OFF/ MEMS/BUZZ outputs the pulse train, key input is suppressed. That is, pressing OFF/MEMS key when the buzzer is buzzing is NOT recognized by SC2128A. The diagram right shows the buzzer connection. SC2128A VSS VDD OFF/MEMS/ BUZZ OFF/MEMS key -5V 15. REMOTE CONTROL DECODER SC2128A is designed to be used together with SC2268 infrared ray remote control encoder. Such combination allows up to 8 remote control keys – SPEED, MODE, TIMER, LIGHT, SLEEP, SW1, SW2, OFF/MEMS – to be built on the remote control handset. 4 bits customer code, b3 ~ b6, is encoded by SC2268 and decoded by SC2128A in order to avoid remote control contention between devices. With SC2268, b3 is determined by bonding option; b4, b5 and b6 are determined by connecting respective c4, c5, c6 pin to VDD or VSS.With SC2128A, b3 and b6 can be mask programmed upon customer request and with NRE. The remote control signal coding scheme is fully compatible with SC2268. Some description follows. Please refer to specification of SC2268 for details. When SC2128A receives a remote control signal at its REMOTE pin, it decodes the received waveform into consecutive “0” bits and “1” bits. It first compares the received start word against its customer code. If and only if the start word matches the customer code, it then compares for two consecutive and matched code words. It then actuates the command according to the code words table shown later. start word 1st code word 2nd code word Code frame b0 b1 b2 b3 b4 b5 b6 b7 Start/Code word: Code bit: "1" bit: 0.625ms 1.875ms 2.5ms "0" bit: |
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