Description
HT-12E Encoder for Remote-Control Systems
The HT-12E is an encoder IC from the 212-series family, intended to pair with a compatible 212-series decoder. The source lists RF and infrared applications. The encoder/decoder pair must use the same number of address bits and the same data format.
The HT-12E converts parallel inputs to serial output for transmission. Its 12-bit word comprises 8 address bits and 4 data/address bits. Transmission enable (TE) is active low. When TE is triggered, the programmed address/data and header are sent over an RF or infrared link. The source describes a four-word transmission cycle that repeats while TE stays low; when TE returns high, the current cycle completes and transmission stops.
See the HT-12D decoder listing.
Pin functions
| Pin | Function | Name |
|---|---|---|
| 1–8 | Eight address inputs | A0–A7 |
| 9 | Ground (0V) | GND |
| 10–13 | Four data/address inputs | AD0–AD3 |
| 14 | Transmission enable, active low | TE |
| 15 | Oscillator input | OSC2 |
| 16 | Oscillator output | OSC1 |
| 17 | Serial data output | Output |
| 18 | Supply; table lists 5V (2.4–12V) | VCC |
The supply entry in the source is ambiguous; check the seller-linked datasheet (PDF) for the valid voltage range and oscillator requirements before powering the IC.
