Co-frequency remote IC

 

 

 

 

 


  

 

 

 

 

 

 

 

                             2001 DEC /12

 

       a decoder-encoder combined IC has special function for co-frequency communication, it can be the baseband of transceiver in various remote system, such like infra-ray, wire or wireless control.

       The decoder or encoder has four addresses to configure, the decoder can distinguish the right code from four encoders with four different address transmitting simultaneously. each encoder has eight digital switches to remote, but they are designed for four of three switches, it’s useful to apply this IC to the remotes that work at the same radio frequency without interfering one another.

 

此編解碼IC可用於任何無線或有線收發器之基頻調變和解調變上,IC4address可供選擇,IC特殊性在能分辨正確控制信號而不互相干擾,既使4組發射器使用同一頻率同時發射.

 

       if you have any question about this IC, please contact us.                                           

                                                  (lily.cn@msa.hinet.net)

 

 

IC pin configuration (top view) :   

 

 

          18  17  16  15  14  13  12  11  10              

       

 

  


 

          1   2   3   4   5   6   7   8   9        

 

 

 

1. address bit 0        2. address bit 1         3. NC

4. VCC              5. GND               6. switch bit 0

7. switch bit 1         8 switch bit 2          9. switch bit 3

10. switch bit 4        11. switch bit 5        12. switch bit 6

13. switch bit 7        14. VCC             15. NC

16. RC timing circuit input

   (connect a series R=3.9K to VCC and a shut C=220P to GND external)

17. VCCà select to be a decoder ,or GND à select to be an encoder

18. code input when decoder ,or code output when encoder (TTL level)

 

 

     note1:  switch bit 0-7 are inputs when encoder, or outputs when decoder.

           They are all for TTL level.

           (impedance > 10K when input, current <10mA when output).

     note2: VCC=+2.5 to 8 V

     note3: 4 of 3 switches :  SW2-SW0-SW3   ,    SW2-SW1-SW3

                        SW6-SW4-SW7   ,    SW6-SW5-SW7

 

     where   SW2-SW0-SW3 =>SW0 or SW2 or SW3 or SW0+SW2 or SW0+SW3

             SW2-SW1-SW3 =>SW1 or SW2 or SW3 or SW1+SW2 or SW1+SW3

             SW6-SW4-SW7 =>SW4 or SW6 or SW7 or SW4+SW6 or SW4+SW7

             SW6-SW5-SW7 =>SW5 or SW6 or SW7 or SW5+SW6 or SW5+SW7

 

Fig1. This picture shows the ICs applying in a pair of wireless control