HT12D IC
is a CMOS series 12-bit RF decoder. Mostly remote control applications have this technology. It gets to interface with the third device and helps it to decode 12-bits data. In this decoder, only 4-bits are data the remaining part is the address. The address will describe the location but 4-bits combination could make 16 types of different combinations. The HT12D decoder can not work alone. It works with another counterpart called an encoder. To receive the data between encoder and decoder address bits should be matched. The encoder can be with any CMOS technology. Most modern applications use the encoder for decoding due to its simplicity and efficiency.
 
HT12D RF Decoder Features
HT12D designed with Low power CMOS technology.
The CMOS technology gives Low noise immunity to the Decoder.
A single IC can decode up to 12-bit data without using any third device.
RF and IR wireless modules can interface directly with the IC.
Valid transmission helps the external device to learn about decoding status.
IC has a builtin Oscillator which requires only a 5% resistor to operate.
There are two different packages of the IC, SOP, and DIP.
RF Decoder Electrical Specifications
2.4 to 12V is the operating voltage range of the IC. The recommended and mostly used operating voltages with IC is 5V.
5V comes with multiple controllers and smart boards which makes it the most useful ones.
The standby Current of the decoder is 4uA at 5V and 400uA for 12V.
The oscillator frequency of the decoder is 150KHz with 51K ohm resistor at 5V.
The decoder operating temperature range is -20 to 75 degree but it also can store the temperature of -50 to 125 degrees.
 
How to use HT12D
To use the HT12D the pins connection should be according to its requirement. First, connect the power supply. Then connect it to the message receiving module which can be an RF receiver or IR receiver. After that connect the decoder with the receiving device. Keep the VT pin high on the IC. Most of the time VT kept high to indicate the valid transmission. The address pins will use to give the address. They should be on the LOW or HIGH state. All address pins represent an 8-bit address. In case of no state on any pins, the decoder would not be able to work properly. The 8-bits message could be a simple message or a complex one. Then, the output pin will connect to the external device which should work on different inputs. In the last attach the 470ohm resistor with the decoder.