The device includes an internal integrated adjustable IR carrier frequency generator, the generated frequency range of which is 4kHz to 1MHz. By using Holtek’s development tool, four common IR carrier frequency options of 36/38/40/56kHz are provided as well as the internal oscillation frequency which can be adjusted to 3.996/3.99/4.0/3.976MHz. This effectively reduces the frequency division error making the IR transmitter carrier frequency more compatible with the IR receiver carrier frequency, which will increase the IR transmission distance.

The device has an operating voltage range of 1.8V~5.5V. With regards to other system resources, the device has a Flash Program Memory capacity of 1K×13, a Data Memory capacity of 32×8, a 9-bit Timer and a Time Base. The internal high frequency oscillator has a fixed frequency of 4MHz with an accuracy of up to ±0.4% and an IR LED drive current which can be up to 500mA. With regards to packaging, the device is supplied in 8-pin SOP, 16-pin NSOP and 20-pin NSOP/SSOP package types.