Model your chip from its datasheet.

A register map GUI for any I2C or SPI chip. Enter the registers once, and UXB-300 turns them into named bit fields with real units and keeps the project for next time. Runs in Chrome or Edge, nothing to install.

Open UXB-300 Join the Pro waitlist

UXB-300 showing the Si5351 clock generator registers by name, with the CLK0_CTRL bit fields as dropdowns and a 4 mA drive setting — An Si5351 clock generator in UXB-300: every register by name, and CLK0_CTRL bit fields as plain settings, down to the 4 mA drive strength.

How it works

Connect your adapter: any from the Dongle King list, or your own with Packet Builder.
Add the chip's registers and name the bit fields; set units and conversions, such as raw counts to °C or hPa.
Read, write and watch live values; save the project and open it again on any adapter.

What you get

Register maps with named bit fields, read and write access, and paged registers (PMBus-style PAGE handled for you).
Parameters that span several registers, shown as one value in real units.
Scripts: write, read, delay, pin and loop steps, to bring a chip up the same way every time.
Packet Builder: set the send and fetch formats to talk to your own or a custom dongle.
One project, many adapters: move from a MIKROE USB I2C Click to a Bit Pirate without redoing the map.
Publish and share: send a link to your project, and open system projects others share with you from UXB-500.

Examples: KB2040 with an LPS22HB pressure sensor · M5StickC Plus2 with an LTR-329 light sensor.

Free and Pro

Free includes live use, Packet Builder, and up to 3 saved projects you can publish and share. Pro, coming in early 2027, adds unlimited projects and script export and import. See pricing.

Works in Chrome and Edge on desktop.

Open UXB-300 Join the Pro waitlist

Need several chips in one panel? UXB-500 is coming in early 2027.