CP2108-B03-GM
CP2108-B03-GM - USB 2.0 to Quad-UART Bridge | Silicon Labs
Silicon Labs CP2108-B03-GM is a USB 2.0 full-speed interface bridge with four asynchronous UART channels, 16 digital I/O pins, and customizable on-chip EEPROM, housed in a 64-QFN package measuring 9 mm by 9 mm. It operates from a 3 V to 3.6 V supply and integrates a USB function controller, USB transceiver, oscillator, EEPROM, and four UART interfaces with full modem-control signals.
A USB-to-UART bridge is an interface IC that connects a USB host to one or more legacy serial ports. Within the product hierarchy, the CP2108 belongs to interface bridges, then USB interface controllers, interface ICs, and integrated circuits. This integration lets equipment designers add four serial channels without implementing separate USB controllers, transceivers, oscillators, and discrete serial-interface circuitry on the printed circuit board.
The verified feature set includes USB 2.0 operation, four UART data buses, full modem-control signals, 16 digital I/O pins, and EEPROM fields for custom USB identifiers and descriptors. The EEPROM can store USB Vendor ID, Product ID, product description, power descriptor, release number, and interface strings. This configurability supports product differentiation while retaining a common USB-to-serial controller design.
Silicon Labs positions the CP2108 as a plug-and-play bridge with royalty-free drivers. The four UART channels provide independent asynchronous serial connections for control, data, instrumentation, or service functions, while the digital I/O pins add discrete digital signaling. Exact UART baud-rate limits, current consumption, operating-temperature limits, pin names, and electrical timing values were not included in the supplied verified data and therefore require confirmation from the manufacturer datasheet.
Typical applications include industrial test equipment, multiport serial adapters, instrumentation, POS terminals, embedded systems, and legacy RS-232 or RS-485 equipment being modernized through USB. In each design, the host driver enumerates the bridge and exposes its four UART interfaces while the on-board controller manages the USB transaction scheduling and asynchronous byte transfer.
The main PCB consideration is that a 64-QFN footprint requires a land pattern capable of routing USB, ground, UART, modem-control, and digital-I/O signals. Place the device near the USB connector, keep high-speed USB traces short and impedance-controlled, connect decoupling close to the supply pins, and maintain the datasheet-specified ground and exposed-pad connections.
This page combines verified manufacturer and distributor data, strict package-aware substitution screening, application guidance, and practical integration notes. The alternatives list intentionally excludes single-port bridges and devices with different packages because they are not verified pin-to-pin drop-in replacements.
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