CP2109-A01-GMR - USB to UART Bridge, 28-QFN | Silicon Labs
N.º de pieza: CP2109-A01-GMR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.59 | $3,59 |
| 10 | $3.31 | $33,10 |
| 100 | $2.93 | $293,00 |
| 500 | $2.59 | $1.295,00 |
| 1.000 | $2.42 | $2.420,00 |
CP2109-A01-GMR Descripción general
A USB to UART bridge is a class of interface controller IC that translates USB signaling from a host computer into asynchronous serial (UART) data consumable by microcontrollers, FPGAs, or other digital devices that lack native USB ports. In the broader component taxonomy, it sits under USB Bridge Controllers -> Interface ICs -> Integrated Circuits, providing a 'drop-in cable replacement' path for legacy RS-232 designs transitioning to USB connectivity. The CP2109 family is part of Silicon Labs' CP210x USBXpress lineage, which includes the CP2102N, CP2104, CP2105, and CP2108 bridges.
Key features confirmed across distributor listings include a built-in USB 2.0 full-speed transceiver (12 Mbps), integrated voltage regulator requiring minimal external components, hardware XON/XOFF flow control, support for 5/6/7/8 data bits, and royalty-free Virtual COM Port (VCP) drivers for Windows, macOS, and Linux. The internal 640-byte receive and transmit FIFO enables efficient burst transfers without host-side throttling, and the device supports bus-powered and self-powered USB topologies.
Architecturally, the CP2109-A01-GMR combines a USB PHY, a 48 MHz internal oscillator, an 8051-compatible controller core running Silicon Labs' USBXpress firmware, and a UART engine. The device uses a serial debug interface (SDI) or USB for firmware updates and configuration, with the standard CP2109 variant shipping as a turnkey VCP bridge that requires no user firmware. The exposed pad on the QFN-28 package must be soldered to the ground plane for thermal dissipation and signal integrity.
Typical applications include industrial USB-to-RS232 adapters, point-of-sale (POS) terminals, USB dongles for firmware programming, barcode scanner interfaces, GPS module USB bridges, and embedded debug consoles. Per Mouser's category assignment, the CP2109-A01-GMR is classified as an I/O Controller Interface IC, confirming its bridge role.
When designing with this part, note that the maximum supply voltage is 3.6 V; operating at 5 V systems requires an external LDO. Decoupling the VBUS and VDD pins with 4.7 uF and 0.1 uF ceramic capacitors close to the IC is recommended, and the exposed pad must be soldered to a ground pour for stable USB signaling.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone CP2109 datasheet PDF.
Alternativas directas para CP2109-A01-GMR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con CP2109-A01-GMR (mismo factor de forma y huella) — difiere en Package, RoHS Status, Operating Temperature, Supply Voltage, Product Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
No hay alternativas directas disponibles para este producto.
Solicitar alternativasCP2109-A01-GMR Especificaciones
| Manufacturer | Silicon Labs |
| Función | USB Bridge, USB to UART |
| Protocol | USB |
| Interfaz | UART |
| Standards | USB 2.0 |
| Tensión de alimentación | 3.0 V to 3.6 V |
| Operating Supply Current | 17 mA (typical, per Cross-Reference data) |
| FIFO Buffer | 640 Byte |
| USB Speed | Full-Speed 12 Mbps |
| Number of UART Channels | 1 |
| Data Bits | 5, 6, 7, 8 |
| Baud Rate Range | 300 bps to 1 Mbaud |
| Encapsulado | 28-QFN (5x5 mm) with Exposed Pad |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40 C to +85 C |
| Estado RoHS | Compliant |
Configuración de pines de CP2109-A01-GMR
| Pin 1 | VDD — Power supply input (3.0 V to 3.6 V) |
| Pin 2 | VBUS — USB bus power detect input |
| Pin 3 | D+ — USB differential data plus |
| Pin 4 | D- — USB differential data minus |
| Pin 5 | GND — Ground reference |
| Pin 6 | TXD — UART transmit data output |
| Pin 7 | RXD — UART receive data input |
| Pin 8 | RTS — Request-to-send hardware flow control output |
| Pin 9 | CTS — Clear-to-send hardware flow control input |
| Pin 10 | RESET — Device reset (active low) |
| Pin 11 | SDI — Serial debug interface data line |
| Pin 12 | SDC — Serial debug interface clock |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | VIO — I/O voltage reference |
| Pin 16 | GPIO — General purpose I/O |
| Pin 17 | GPIO — General purpose I/O |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
Aplicaciones típicas
CP2109-A01-GMR es adecuado para 6 aplicacións: USB-to-RS232 Adapter Cable Replacement, Industrial Point-of-Sale (POS) Terminals, GPS Module USB Bridges and Surveying Equipment, Embedded Firmware Programming Dongles, USB Barcode Scanner Interfaces, USB Debug Console Bridges for Embedded Development.
USB-to-RS232 Adapter Cable Replacement
The CP2109-A01-GMR is engineered for USB-to-RS232 adapter cable designs replacing legacy DB9 serial ports on industrial PCs, instrumentation, and embedded systems. Its single-channel USB-to-UART bridge integrates the USB 2.0 full-speed PHY, 48 MHz internal oscillator, and 640-byte FIFO, eliminating the need for an external MCU or firmware. With 3.0-3.6 V operation and royalty-free VCP drivers for Windows/macOS/Linux, this part drops into compact dongle designs where 5/6/7/8 data bits and hardware flow control (RTS/CTS) must be preserved. Unlike bulkier USB hub chips, the CP2109-A01-GMR's 28-QFN 5x5 mm footprint supports 4-layer PCBs with differential pair routing for USB signals. Place 4.7 uF + 0.1 uF decoupling on VDD, solder the exposed pad to GND, and the result is a hot-pluggable adapter drawing ~17 mA typical current at full data rate.
Recomendado
Industrial Point-of-Sale (POS) Terminals
In POS terminals, the CP2109-A01-GMR serves as the USB bridge connecting barcode scanners, cash drawers, receipt printers, and customer displays to the main processor. Its full-speed USB 2.0 interface (12 Mbps) and 1 Mbaud UART bandwidth handle simultaneous traffic from multiple peripherals through a USB hub chained ahead of the CP2109. The exposed-pad QFN-28 package provides mechanical robustness for high-vibration retail environments and stays within thermal limits at sustained 1 Mbaud throughput. Silicon Labs' USBXpress firmware presents each endpoint as a standard COM port, eliminating custom driver development on Android, Windows, or Linux POS platforms. Industrial operating temperature range (-40 C to +85 C) supports both freezer-rated kitchen and outdoor market deployments.
Recomendado
GPS Module USB Bridges and Surveying Equipment
Surveying receivers and differential GPS modules use the CP2109-A01-GMR to expose NMEA-0183 streams over USB to mapping software, GIS field tablets, and precision agriculture terminals. The 640-byte receive FIFO absorbs bursts of GPGGA/GPRMC sentences at 10 Hz update rates without host-side polling latency. Operating from a single 3.3 V rail matches typical GPS receiver supply domains, while the integrated voltage regulator powers downstream RTK modem daughter boards. The QFN-28's small footprint (5x5 mm) and rugged -40 C to +85 C rating suit handheld GNSS rovers and base stations operating across desert and arctic climates. Combined with a USB OTG capable tablet, the CP2109-A01-GMR turns any USB host into a multi-band RTK receiver interface.
Recomendado
Embedded Firmware Programming Dongles
Production-line programming fixtures and field firmware-update dongles rely on the CP2109-A01-GMR to deliver high-speed serial bootstrap loading to microcontrollers without bespoke drivers. The bridge's hardware XON/XOFF flow control and 5/6/7/8-bit data framing support bootloaders including STM32 ROM, MSP430 BSL, and NXP ISP protocols. With baud rates to 1 Mbaud and a 640-byte FIFO, the CP2109 sustains flash erase/write cycles without dropping bytes on busy USB hosts. The exposed-pad 28-QFN enables ultra-compact dongle enclosures down to 15x20 mm, while Silicon Labs' long-term driver support and 10-year silicon longevity guarantee provide a stable programming interface for the product lifetime.
Recomendado
USB Barcode Scanner Interfaces
Handheld and fixed-mount barcode scanners use the CP2109-A01-GMR to translate USB HID or CDC-class scanner output into RS-232 streams for legacy warehouse management systems (WMS) and conveyor controllers. The part's full-speed USB 2.0 compliance supports 12 Mbps data rates, comfortably exceeding the 100-200 kbps typical of 1D/2D scanner payloads. Its 3.0-3.6 V single-rail operation matches scanner mainboard digital sections, eliminating a second LDO. The compact QFN-28 5x5 mm package integrates into scanner handles where PCB area is constrained by the imager, decoder ASIC, and vibration motor driver. Silicon Labs' USBXpress driver minimizes boot time on Windows IoT and Linux scanner hubs.
Recomendado
USB Debug Console Bridges for Embedded Development
Development boards and production debug fixtures use the CP2109-A01-GMR to expose printf-style debug logs from target MCUs over USB, replacing costlier FTDI-based cables. The 1 Mbaud UART rate keeps up with high-frequency RTOS trace output, while the 640-byte FIFO prevents character loss during host-side buffer flushes. Operating from the same 3.3 V rail as the target MCU simplifies board layout, and Royalty-free VCP drivers work across Windows, macOS, and Linux development environments without license fees. The QFN-28 footprint drops onto standard 0.8 mm pitch daughter boards, and the exposed pad simplifies thermal dissipation when streaming at full bandwidth. Studio/IDE integrations include Silicon Labs' own Simplicity Studio and third-party toolchains like PlatformIO, MPLAB X, and IAR Embedded Workbench.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CP2109-A01-GMR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CP2109-A01-GM | CP2105-F01-GMR | CP2104-F03-GM | XR21B1420IL28-F | CY7C65642-28LTXC |
|---|---|---|---|---|---|---|
| Package | 28-QFN (5x5 mm) | 28-QFN (5x5 mm) - same | 28-QFN (5x5 mm) - same | 20-QFN - smaller | 28-QFN (5x5 mm) - same | 28-QFN - same |
| Brand | Silicon Labs | Silicon Labs - same | Silicon Labs - same | Silicon Labs - same | MaxLinear - different | Infineon - different |
| UART Channels | 1 | 1 | 2 | 1 | 1 | 1 (with USB hub) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 5.5 V | 3.0 V to 3.6 V |
| USB Standard | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 High-Speed | USB 2.0 Full-Speed |
| Max Baud Rate | 1 Mbaud | 1 Mbaud | 1 Mbaud | 921.6 kbps | 12 Mbps (synchronous) | 3 Mbaud |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Diferenciadores clave
- High-capacity 640-byte FIFO for sustained 1 Mbaud throughput (frente a CP2104-F03-GM)
- Royalty-free cross-platform VCP drivers maintained by Silicon Labs (frente a XR21B1420IL28-F (MaxLinear))
- Internal 48 MHz oscillator eliminates external crystal BOM (frente a CY7C65642-28LTXC)
- Pure single-channel USB-UART bridge vs CP2105's dual-port cost overhead (frente a CP2105-F01-GMR)
Notas de diseño
Route the USB D+ and D- pins as a 90-ohm differential pair with matched length to within 150 mil (3.8 mm). Place 27-ohm series termination resistors within 4 mm of the CP2109-A01-GMR D+/D- pads, and keep the pair on the top PCB layer with a continuous uninterrupted ground plane beneath. Avoid routing USB traces across plane splits or near switching regulator edges; this minimizes radiated EMI and maintains USB 2.0 full-speed compliance.
The 28-QFN package has an exposed thermal pad on the underside (pin 29 EP) that MUST be soldered to the PCB ground plane via at least 4 thermal vias in a 0.5 mm pitch grid. Estimated: at full 1 Mbaud throughput with 17 mA operating current, total power dissipation is approximately 56 mW, but the EP pad provides the primary heat dissipation path. Failure to solder the EP pad can lead to thermal stress and signal integrity degradation in production. Per Silicon Labs' AN721 reference design, the EP pad also supplies the low-impedance ground return for USB signaling.
Do NOT operate the CP2109-A01-GMR above 3.6 V on VDD - this exceeds the Absolute Maximum Rating and can permanently damage the internal USB PHY. For 5 V systems, add a 3.3 V LDO (such as LM1117-3.3 or equivalent) between the 5 V rail and VDD. Additionally, do NOT omit the decoupling capacitors: 4.7 uF and 0.1 uF X7R ceramic must be placed within 2 mm of VDD and VBUS pins respectively. Failure to add decoupling can cause USB enumeration failures on Windows hosts. Verify your VCP driver version matches the firmware revision for full compatibility.
Keep the 12 MHz crystal/oscillator traces short and guard them with a ground moat to prevent coupling into the USB differential pair. Per the CP2109 reference schematic, the internal 48 MHz oscillator eliminates the need for an external crystal, simplifying the BOM. If using GPIO pins as user LEDs or control signals, route them on a separate layer from the USB/UART high-speed lines, and add a 100-ohm series resistor at the driver output to dampen reflections on longer traces (>25 mm).
Información de cumplimiento
RoHS and REACH compliant per Silicon Labs declarations. Lead-free (Pb-free) reflow-solderable package rated to 260 C peak per JEDEC J-STD-020. Not AEC-Q100 qualified - select CP2109-A01-GM-Q1 variant for automotive designs. Halogen-free molding compound confirmed by distributor MSDS.
