CP2101

Controllers Overview

The CP2101 is a single-chip USB to UART bridge controller from Silicon Labs, integrating a USB 2.0 full-speed function controller, transceiver, oscillator, and asynchronous serial data bus (UART) within a compact 5 x 5 mm MLP-28 package. It supports baud rates from 300 bps to 921.6 kbps with 512-byte receive and transmit buffers. The device features an on-chip 512-byte EEPROM for customizing USB descriptors and includes a 3.3 V voltage regulator. Operating temperatures range from -40 °C to +85 °C.

Controllers Feature Summary

• Integrates USB 2.0 full-speed controller and UART interface without requiring external crystals or resistors
• Includes 512-byte onboard EEPROM for programmable vendor ID, product ID, and serial number customization
• Provides royalty-free Virtual COM Port drivers enabling transparent communication with existing PC applications

Controllers Applications

• Upgrading legacy RS-232 devices to USB interfaces
• Cellular phone USB interface cables
• PDA USB interface cables
• USB to RS-232 serial adapters

Controllers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature rating. Ensure compatibility with required operating systems before deployment. Confirm that the selected variant meets the necessary power supply configuration requirements for your design.

Controllers Selection Notes

Select the CP2101 when a highly integrated solution is needed to replace RS-232 level translators with minimal PCB space. Consider its internal voltage regulator capabilities for both bus-powered and self-powered configurations. Evaluate the need for customizable USB descriptors stored in the onboard EEPROM for OEM identification purposes.

Controllers Part Context

The CP2101 belongs to Silicon Labs' classic USB-to-UART bridge family, designed for simple integration into embedded systems. It serves as a direct replacement for traditional RS-232 converters, offering a drop-in upgrade path for legacy hardware designs while maintaining standard serial communication protocols.

Controllers Replacement Considerations

Direct functional replacements include the CP2102 and CP2104. Verify pinout compatibility and package dimensions when substituting, as the CP2101 uses a unique 28-pin MLP package compared to other series members.

Controllers FAQ

Does the CP2101 require an external crystal?

No, the CP2101 integrates an on-chip oscillator, eliminating the need for an external crystal.

What is the maximum baud rate supported by the CP2101?

The CP2101 supports baud rates up to 921.6 kbps.

Can the USB descriptors be customized on the CP2101?

Yes, the internal 512-byte EEPROM allows customization of the Vendor ID, Product ID, Serial Number, and Product Description String via USB programming.