Working of HT12E Encoder IC

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pin-diagram-configuration-IC-HT12E
Pin Diagram of IC HT12E

HT12E is a 2^12 series encoder IC widely used in remote control and very common among Radio Frequency RF applications. This HT12E IC capable of converting 12 bit Parallel data inputs into serial outputs. These bits are classified into 8 (A0-A7) address bits and 4(AD0-AD3) data bits. Using the address pins we can provide 8 bit security code for secured data transmission between the encoder and the decoder. The encoder and decoder should use the same address and data format. HT12E is capable of operating in a wide Voltage range from 2.4V to 12V and also consists of  a built in oscillator. Let’s move into the working of HT12E encoder IC.

PIN DESCRIPTION OF IC HT12E: 

The pin Description of the IC HT12E was pretty simple to understand with total of 18 pins.

  • VDD and VSS: Positive and negative power supply pins.
  • OSC1 and OSC2: Input and output pins of the internal oscillator present inside the IC.
  • TE: This pin is used for enabling the transmission, a low signal in this pin will enable the transmission of data bits.
  • A0 – A7: These are the input address pins used for secured transmission of this data. These pins can be connected to VSS for low signal or left open for high state.
  • AD0 – AD3: This pins are feeding data into the the IC. These pins may be connected to VSS for sending LOW since it is a active low pin
  • DOUT: The output of the encoder can be obtained through  this pin and can be connected to the RF transmitter.

WORKING OF HT12E IC: 

timing-diagram-ht12e-icHT12E starts working with a low signal on the TE pin. After receiving a low signal the HT12E starts the transmission of 4 data bits as shown in the timing diagram above. And the output cycle will repeats based on the status of the TE pin in the IC. If the TE pin retains the low signal the cycle repeats as long as the low signal in the TE pin exists. The encoder IC will be in standby mode if the TE pin is disabled and thus the status of this pin was necessary for encoding process. The address of these bits can be set through A0 – A7 and the same scheme should be used in decoders to  retrieve the signal bits.

PRACTICAL CIRCUIT USING HT12E:

HT12E-practical-application-circuit
Practical Application Circuit

The above diagram shows the practical set up of the HT12E encoder IC for better understanding on the working.

Related Designs and Schematics

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Frank Donald

Frank Donald

Junior Network Engineer at Tata Communications
Frank Donald is an Electronics and Communication Engineer who loves building stuff in his free time. Video games, blogging and programming are the things he loves most
Frank Donald

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33 Comments on "Working of HT12E Encoder IC"

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Girishkumar
Guest

sir,which algorithm used in this encoder ic ?

Saran
Guest

Sir, i made the address bit as 0 and data as 1000 then the transmitted data is
syn.bit 0 0 0 0 0 0 0 0 1 0 0 0 am i right. Then what about the syn.bit.

Saran
Guest

Sir, which type of encoding technique is used in HT12E?

Kartik Sikka
Guest

What is the frequency of the Serial Data Produced at the OUTPUT pin of the HT12E IC

Santosh G B
Guest

What will be the output of Dout of HT12E if the input signal is from ARM CONTROLLER?

Jatin Goyal
Guest

how many data pins we can give data into ht12e. & why A0-A& pins are used
and i wanna build a 20 channel transmitter so please guide by giving some iinnfo or helpful links

Yesha kansara
Guest

what is the value of resistor connected to pin 16 of HT12E?
how can we deside that value?

NIKHIL SINGH
Guest

sir, from where can i get the whole kit of 433 mhz transmitter receiver.
please send me on nikhilsingh22895@gmail.com
I WANT THE WHOLE KIT WITH CONNECTION DIAGRAM AND ALL COMPONENTS.
I WILL BUY IT FOR ANY COST.
OR A READY MADE VERSION OF 433 MHZ RUNNING KIT WILL ALSO DO.

shailesh
Guest

What is the necessary of the OSC1 and OSC2 in the encoder and decoder fort transmission of the data

shailesh
Guest

What is the necessary of the OSC1 and OSC2 in the encoder and decoder fort transmission of the data

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