Description: HT12E Encoder Chip For RF Module 18 Pin DIP
HT12E IC HT12E Encoder Chip DIP-18 18 Pin Leads Dual In Line Package Chip
HT12E is an encoder integrated circuit of 212 series of encoders. They are paired with 212 series of decoders for use in remote control system applications. It is mainly used in interfacing RF and infrared circuits. The chosen pair of encoder/decoder should have same number of addresses and data format.
Simply put, HT12E converts the parallel inputs into serial output. It encodes the 12 bit parallel data into serial for transmission through an RF transmitter. These 12 bits are divided into 8 address bits and 4 data bits. HT12E has a transmission enable pin which is active low. When a trigger signal is received on TE pin, the programmed addresses/data are transmitted together with the header bits via an RF or an infrared transmission medium. HT12E begins a 4-word transmission cycle upon receipt of a transmission enable. This cycle is repeated as long as TE is kept low. As soon as TE returns to high, the encoder output completes its final cycle and then stops.
Features of HT12E Encoder IC:
Operating voltage 2.4V~12V.
Low power and high noise immunity CMOS technology.
Low standby current: 0.1A (typ.) at VDD=5V.
Data code has positive polarity.
HT12A with a 38kHz carrier for infrared transmission medium.
Minimum transmission word Four words for the HT12E.
Built-in oscillator needs only 5% resistor.
Minimal external components.
How to use a HT12E Encoder IC
The primary function of HT12E is to encode a 12-bit and send it out through the output pin. Since the IC comes with an in-built Oscillator it is very easy to make this IC work. The IC is has a wide range of operating voltage from 2.4V to 12V, but normally the Vcc pin (pin 18) is powered by +5V and the ground pin (pin 9) is grounded. Pull the Transmission Enable pin (pin 14) to ground to activate transmission. For decoding a data the IC will requires an oscillator, luckily this IC has one in-built. We just have to connect the OSC1 and OSC2 (pin 15 & 16) through a 1M resistor to invoke it. The 4-bit data that has to be sent has to be given to the pins AD0 to AD1 and an address of 8-bit has to be set using the pins A0 to A7. It is very important that your Decoder should also have this same address for them to talk to each other. A basic connection diagram for the HT12E IC is shown below
Applications of HT12E Encoder IC:
Burglar alarm system.
Smoke and fire alarm system.
Garage door controllers.
Car door controllers.
Car alarm system.
Other remote control systems
1 x HT12E Encoder Chip For RF Module 18 Pin DIP