This manual introduces the use of the VFD DEMO KIT, including the appearance of the DEMO BOARD and three usage methods, as well as the operation and use of the MCU mode.
The VFD DEMO KIT is a development board from Holtek that uses the HT49CVX VFD MCU series to drive VFD panels directly, without extra driver chips. It includes a keypad display, infrared remote receiver, A/D conversion and temperature measurement functions.
The board can operate in three ways – MCU mode, HT49CVX mother‑board + ROM‑LESS mode, and emulator mode – each with its own jumper settings and power configuration. A built‑in voltage doubler converts a 9 V DC input to –30 V for the VFD and +5 V for the MCU, and the infrared remote mirrors the keypad functions for clock setting, media selection, playback control, dimming and sensor read‑outs. This manual is written in Chinese.
| VFD working voltage | -30 V |
|---|---|
| Power input | 9 V DC |
| Output voltages | -30 V, +5 V |
| A/D conversion & temperature measurement | Supported |
| Remote control keys | 16 |
Connect a 9 V DC source to the board’s power socket; the built‑in voltage doubler then provides –30 V for the VFD and +5 V for the MCU.
The board supports three modes – MCU mode, HT49CVX mother‑board + ROM‑LESS mode, and emulator mode – selected by using the appropriate board configuration and jumper settings.
The infrared remote receiver captures key presses and switches the display mode accordingly; each remote key corresponds to functions such as clock setting, media selection, play, pause, dimming, and sensor read‑outs.