The GPIO Expander IC BU1850MUV is a chip used to expand IO ports. It can control GPIO output states through the I2C write protocol and read GPIO input states through the I2C read protocol. Furthermore, it has an interrupt function that can release the CPU from polling the registers in the GPIO expander. GPIO expanders are also equipped with built-in power on reset, 3V tolerant input, and NMOS open-drain output.
The BU1850MUV is an 8‑port GPIO expander IC with NMOS open‑drain outputs, 3 V‑tolerant inputs, built‑in power‑on‑reset and interrupt capability. It communicates via an I²C‑compatible bus and supports up to 400 kHz fast‑mode data rates.
The document provides absolute maximum ratings, operating conditions, package dimensions, pin assignments, functional block diagrams, and detailed read/write protocols. Ordering information and legal notices are also included.
| GPIO ports | 8 |
|---|---|
| Package size | 3 mm × 3 mm |
| Maximum I²C bus speed | 400 kHz |
| Operating temperature range | -30 °C – +85 °C |
The device supports up to 400 kHz Fast‑mode data transfer rate.
The BU1850MUV provides eight general‑purpose I/O pins.
It uses a VQFNO16V3030 package measuring 3 mm × 3 mm.