HT12E is a 212 series encoder IC (Integrated Circuit) for remote control applications. It is commonly used for radio frequency (RF) applications. By using the paired HT12E encoder and HT12D decoder we can easily transmit and receive 12 bits of parallel data serially. HT12E simply converts 12 bit parallel data in to serial output which can be transmitted through a RF transmitter. These 12 bit parallel data is divided in to 8 address bits and 4 data bits. By using these address pins we can provide 8 bit security code for data transmission and multiple receivers may be addressed using the same transmitter.
HT12E Pin Configuration:
|Pin Number||Pin Name||Description|
|1 to 8||A0,A1,A2,A3,A4,A5,A6 & A7||These are the 8-bit address bits, which is used to protect your data. We should set the bits in same pattern on Encoder and Decoder IC to pair them.|
|9||Ground/Vss||Connected to the Ground of circuit|
|10 to 13||AD0, AD1, AD2 & AD3||These four pins are used to send data, the data encoded here will be decoded on HT12D IC sharing the same address bits|
|14||Transmission Enable(TE)||This pin has to be connected to Ground (0V) to enable the Transmission.|
|15 and 16||Oscillator pins 1 & 2||The IC has a built in oscillator. This oscillator can be used by connecting these two pins through a 1M Resistor|
|17||Output||The Encoded 12 bit output data can be obtained from this pin|
|16||Vcc/Vdd||This pin powers the IC, typically +5V is used. Can range from 2.4V to 12V|
Typical Application Circuit:
Use Rosc = 1.1MΩ as recommended in the datasheet.