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Holtek HT12D Encoding and Decoding IC - Working Principle, Circuit Connection, PDF DataSheet, and Pricing

September 06, 2023

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Introduction

Holtek HT12D is a widely used encoding and decoding IC in remote control applications. It is capable of receiving and decoding signals encoded by HT12E, making it suitable for remote control of devices such as lights, fans, and door locks. This article provides a detailed overview of HT12D's working principle, circuit connection methods, a PDF data sheet, and pricing information to help you better understand and apply this IC.

HT12D Decoder IC

Working Principle

Holtek HT12D is a 12-bit decoder primarily used to decode signals encoded by HT12E. It receives RF signals from a remote control transmitter through an external antenna. The received signals are then decoded, converting them into 12-bit parallel binary data. This decoded data can be supplied to external devices through output pins to perform corresponding control functions. The working principle of HT12D involves the following steps:

  • RF Reception: HT12D receives RF signals from a remote control transmitter through an external antenna.

  • Decoding: The received signals undergo decoding, resulting in 12-bit parallel binary data.

  • Output Data: Decoded data can be supplied to external devices through output pins to perform the intended control functions.


Circuit Connection

To use HT12D, it is essential to correctly connect it to your circuit. Below is the basic circuit connection diagram for HT12D:

HT12E&HT12D circuit

Ensure that you follow the circuit connection instructions provided in the HT12D data sheet to ensure proper decoding operation. Detailed pin function descriptions can be found in the datasheet. Pin Number Pin Name Description 1 to 8 A0 to A7 These are 8 address bits used for data protection. Matching bit patterns should be set on the encoder and decoder ICs for pairing. 9 Ground/VSS Connects to the circuit ground 10 to 13 AD0 to AD3 These four pins are used to obtain data bits from the decoded HT12E IC data 14 Input This is where the encoded 12-bit output data from HT12E must be provided 15 and 16 Oscillator Pins 1 and 2 The IC has a built-in oscillator. Connect these two pins with a 1M resistor to use the oscillator. 17 Valid Transmission (VT) This pin goes high when data is received. It is optional to use. 16 Voltage/VDD This pin supplies power to the IC and should be connected to 5V. 


HT12D Pinout

Pin NumberPin NameDescription
1-8A0, A1, A2, A3, A4, A5, A6, and A7These are 8 address bits used for data protection. Matching bit patterns should be set on both the encoder and decoder ICs for pairing.
9Ground/VSSConnects to the circuit ground
10-13AD0, AD1, AD2, and AD3These four pins are used to obtain data bits from the decoded HT12E IC data
14InputThe encoded 12-bit output data from HT12E must be provided at this pin
15-16Oscillator Pins 1 and 2The IC has a built-in oscillator. Connect these two pins with a 1M resistor to use the oscillator.
17Valid Transmission (VT)This pin goes high when data is received. It is optional to use.
18Voltage/VDDThis pin supplies power to the IC and should be connected to a 5V power source.

HT12D Pinout

PDF DataSheet

HT12D/HT12F 2 Series of Decoders


Pricing Information

The price of HT12D may vary depending on the supplier, quantity purchased, and market demand. For the most accurate and up-to-date pricing, please click here.

como usar modulos de Radio frecuencia con decodificadores HT12E y HT12D

Applications

  • Security Systems: Combining HT12D with sensors can create intrusion detection or access control systems. When sensors detect intrusion or authorized access, HT12D can trigger corresponding responses, such as alarms or unlocking door locks.

  • Smart Homes: Connecting HT12D to home automation controllers enables remote control of smart home systems, including lighting, temperature control, and security features.

  • Remote Monitoring: By integrating HT12D into monitoring systems, you can remotely monitor and control devices or systems at remote locations, such as cameras and access control.

Conclusion

Holtek HT12D is a powerful and reliable encoding and decoding IC suitable for various remote control applications. By correctly connecting it to your circuit and referencing the datasheet, you can easily integrate it into your remote control projects for wireless control.