Instructions for Use:

1. Power Supply:

   • Connect Vcc (Pin 16) to the positive supply voltage (4.5V to 9V).
   • Connect GND (Pin 8) to the ground.

2. Input Signal:

   • Connect the input signal to Pin 1.
   • Ensure the input impedance is at least 47kΩ to avoid loading the signal source.

3. Output Signal:

   • The output is active low. Connect the load or next stage to Pin 15.
   • The output can drive up to 10mA.

4. Tone Frequency Selection:

   • Set the desired tone frequency by connecting the appropriate external resistors and capacitors to Pins 2, 3, 4, and 5.
   • Refer to the datasheet for specific resistor and capacitor values for different frequencies.

5. Threshold Adjustment:

   • Adjust the threshold level using an external resistor connected to Pin 6.
   • This helps in setting the sensitivity of the tone detection.

6. Reset Function:

   • Use Pin 7 for resetting the device. Apply a low signal to reset the decoder.
   • If not used, connect Pin 7 to Vcc.

7. Output Enable:

   • Enable the output by pulling Pin 14 low.
   • If not used, connect Pin 14 to GND.

8. Test Mode:

   • For testing purposes, apply a high signal to Pin 13 to enter test mode.
   • In test mode, the device outputs a continuous tone.

9. Decoding Status:

   • Monitor the status of the decoding process through Pin 12.
   • A low signal on Pin 12 indicates that the correct tone has been detected.

10. Decoding Time:

    • The time required to decode a tone depends on the input signal strength and the threshold settings.
    • Typically, the decoding time is a few milliseconds.

11. Handling Precautions:

    • Handle the IC with care to avoid static damage.
    • Ensure all connections are secure and free from short circuits.

12. Storage:

    • Store the IC in a dry, cool place away from direct sunlight and extreme temperatures.

For detailed application notes and further information, refer to the HT1380 datasheet provided by the manufacturer.