Adafruit CH334F Mini 2-Port USB Hub Breakout

Sometimes, you’ve got something with a USB host, like an embedded Linux board, and you want to connect more than one thing. Or maybe you want to turn something like a keyboard into a multi-device USB peripheral. The Adafruit CH334F Mini 2-Port USB Hub Breakout will do that for you! It features a CH334F USB 2.1 hub chip, which converts one high-speed port into two.

Most folks who use a USB hub get one that comes in an enclosure with connectors or cables included. But those hubs are going to be bulky – they’re meant for external use. This breakout board is designed to be compact and easily embedded into an enclosure or existing device. There are four mounting holes but other than that, we tried to keep it as compact as possible.

Part of how we kept it small is not including downstream ports! The breakout has either a 0.1′ header or USB C for the upstream and four 4-pin ports for peripheral connections. We expect folks to solder directly to the pads or use our ‘simple’ USB breakout cables.

You get one fully assembled/tested board and some header if you want to plug it into a breadboard. Other than that, keep in mind there are no USB ports for the two downstreams – if you need those take a look at some of the other hubs we stock.

We also carry a 4-port version here which is a little less than twice the size.

Specifications

• 4-port USB HUB, providing 4 USB 2.0 downstream ports, backwards compatible with USB 1.1 protocol specification
• Support high-performance MTT mode, providing independent TT for each port to achieve full bandwidth concurrent transmission, with 4 times the total bandwidth of STT
• Support port status LED indicators
• Provides crystal oscillator with a built-in capacitor, supports external 12MHz input, and built-in PLL provides 480MHz clock for USB PHY
• Built-in 1.5KΩ pull-up resistor on the upstream port, built-in pull-down resistor on the downstream port required for USB Host, streamlined periphery
• USB pins have 6KV enhanced ESD performance, Class 3A
• Dimensions: 24.0mm x 20.1mm x 5.0mm
• Weight: 2.2g

Resources

• CH334 Specifications