This document describes the features and characteristics of the HT82K629A product, including operating voltage, operating frequency, compatible operating systems, supported interface modes, supported functions, and special keyboards.
The HT82K629A is a keyboard encoder that operates in both USB and PS/2 environments, supporting Windows 95/98/NT/2000/XP. It offers phantom‑key detection, low‑voltage reset, auto‑detect of the interface, and a built‑in watchdog timer to reduce power consumption.
This manual provides a complete description of the device, including its features, pin‑out diagram, absolute maximum ratings, DC characteristics, functional command set, host‑to‑device and device‑to‑host communication protocols, and package dimensions. It also lists the supported scan‑code sets and the default typematic settings.
| Operating voltage | 4.4 V ~ 5.5 V |
|---|---|
| Operating frequency | 6 MHz |
| Supply voltage (absolute max) | 0.3 V to 6.0 V |
| Storage temperature range | 50 °C to 125 °C |
| Operating temperature range | 0 °C to 70 °C |
It operates from 4.4 V to 5.5 V.
The encoder auto‑detects the interface and supports both USB and PS/2 modes.
The Reset command uses the hex value FF.
The default typematic rate is 10.9 characters per second + 20 % and the delay is 500 ms + 20 %.