GY7501 USB-I2C Adapter is a USB 2.0 interface I2C interface adapter produced by Wuhan Geeyang Photoelectric Technology Co., Ltd. It is powered by the USB bus and does not require external power. The product supports continuous random address reading, supports single-byte writing and page write mode (Page Write).
This manual describes the GY7501 USB‑I2C Adapter produced by Geeyang (武汉吉阳光电科技有限公司). It covers product specifications, physical dimensions, pin assignments, and typical applications such as I2C bus testing and EEPROM access.
The document also explains how to install the provided driver and DCTools software, outlines the available API functions for C/C++ development, and lists technical support contacts and accessories included with the adapter. This manual is written in Chinese.
| USB Interface | USB 2.0, bus‑powered, no external supply |
|---|---|
| I2C Interface | Master mode, SMBus compatible |
| Power Outputs | +3.3 V, +5 V |
| Interface Signals | SCL, SDA, GND, +5 V, +3.3 V, 4 IO ports |
| Operating Temperature | -40 °C to +85 °C |
| Dimensions | 70 mm × 45 mm × 18 mm |
| +5 V Current Capability | max 200 mA |
Connect the adapter to a PC USB port, then run the provided driver installer and select the driver folder as prompted.
The package includes the DCTools I2C utility, a DLL library with API functions, and Visual C++ example code.
It supplies both +3.3 V and +5 V power outputs.
The device operates from –40 °C up to +85 °C.