HT12A/HT12E The transmitted information is as shown: Pilot A0 A1 A2 A3 A4 A5 A6 A7 AD8 AD9 AD10 AD11 &Sync. 1 0 1 0 0 0 1 1 1 1 1 0 Address/Data Sequence The following provides the address/data sequence table for various models of the 212 series of encoders. Address/Data BitsPart No. 0 1 2 3 4 5 6 7 8 9 10 11 HT12A A0 A1 A2 A3 A4 A5 A6 A7 D8 D9 D10 D11 HT12E A0 A1 A2 A3 A4 A5 A6 A7 AD8 AD9 AD10 AD11 Transmission Enable For the HT12E encoders, transmission is enabled by applying a low signal to the TE pin. For the HT12A encoders, transmission is enabled by applying a low signal to one of the data pins D8~D11. Two Erroneous HT12E Application Circuits The HT12E must follow closely the application circuits provided by Holtek (see the ²Application circuits²). · Error: AD8~AD11 pins input voltage > VDD+0.3V O S C 2 V D D O S C 1 A D 1 1 T E A D 1 0 V S S A D 9 A D 8 1 2 V H T 1 2 E · Error: The IC¢s power source is activated by pins AD8~AD11 1 2 V O S C 2 V D D O S C 1 A D 1 1 T E A D 1 0 A D 9 V S S A D 8 H T 1 2 E Rev. 1.20 7 February 20, 2009 Document Outline Features Applications General Description Selection Table Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings Electrical Characteristics Functional Description Application Circuits Package Information Product Tape and Reel Specifications
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