CP2102N-A02-GQFN20 - USB to UART Bridge, QFN-20 | Silicon Labs
N.º de pieza: CP2102N-A02-GQFN20 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.2 | $3,20 |
| 10 | $2.85 | $28,50 |
| 100 | $2.45 | $245,00 |
| 500 | $2.1 | $1.050,00 |
| 1.000 | $1.75 | $1.750,00 |
| 3.000 | $1.4 | $4.200,00 |
CP2102N-A02-GQFN20 Descripción general
A USB-to-UART bridge, also called a USB interface IC or USB-serial converter, is a class of mixed-signal device that converts a USB physical layer (USB 2.0 full-speed) into an asynchronous serial interface. It sits in the broader hierarchy of interface ICs (bridge ICs -> protocol converters -> connectivity ICs -> semiconductors) and replaces legacy RS-232 transceivers with a single-chip, driver-supported solution requiring no external USB components. The bridge transparently handles USB enumeration, bulk transfer, and UART signaling so the host MCU firmware can treat the link as a simple COM port or /dev/tty device.
Key features of the CP2102N-A02-GQFN20 include four configurable GPIO pins, a battery charger detect function for portable designs, support for data formats from 5 to 8 data bits with or without parity, hardware and software flow control (RTS/CTS, XON/XOFF), and a 1024-byte buffer for high-throughput UART operation. The integrated 3.3 V LDO regulator, on-chip oscillator, and internal pull-up resistors eliminate the need for most external components, shrinking the BOM to a few decoupling capacitors plus optional ESD protection.
The architecture is built around a USB 2.0 full-speed (12 Mbps) SIE, an internal 48 MHz oscillator, ROM-based firmware accessed via the Virtual COM Port (VCP) driver or USBXpress direct API, and a flexible UART block with independent TX/R FIFOs. The A02 revision is the recommended replacement for the older A01 revision and is pin-compatible with A01-GQFN20 footprints. The compact 3x3 mm QFN package and minimal external part count make it ideal for space-constrained USB Type-C dongles, embedded debug headers, and industrial sensor interfaces.
Typical applications include USB-to-UART debug consoles on MCU development boards, industrial point-of-sale terminals, portable medical USB instrument front-ends, IoT gateways, and field-upgradable firmware service ports. The integrated driver support for Windows, macOS, and Linux VCP modes, combined with Silicon Labs' USBXpress host libraries, accelerates time-to-market for designs that previously required custom USB stacks.
When designing with this part, place the 4.7uF VBUS decoupling and 100 nF VDD bypass capacitors as close to the IC pins as possible to meet USB 2.0 signal-integrity requirements. The D+ line typically requires a 1.5 kOhm pull-up to 3.3 V for full-speed device detection, and an external 10 kOhm pull-down on TXD is required for Send-Break signaling.
Alternativas directas para CP2102N-A02-GQFN20 — 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 CP2102N-A02-GQFN20 (mismo factor de forma y huella) — difiere en Function, Internal Oscillator, Operating Temperature, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
CP2102N-A02-GQFN20R
✅ Sustitución directa✓ En stock
$1.4 / unidad
Ver hoja de datos →CP2102N-A01-GQFN20
✅ Sustitución directa✓ En stock
Consulte el precio
Ver hoja de datos →CP2102N-A01-GQFN20R
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CP2102-GMR
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.4897 / unidad
Ver hoja de datos →CP2102N-A02-GQFN20 Especificaciones
| Función | USB to UART Bridge Controller |
| Family | USBXpress |
| USB Specification | USB 2.0 Full-Speed (12 Mbps) |
| Supply Voltage (VDD) | 3.0 V to 3.6 V |
| UART Data Bits | 5, 6, 7, or 8 |
| GPIO Pins | 4 |
| Baud Rate | Up to 1 Mbaud (typical application) |
| Parity | None, Even, Odd, Mark, Space |
| Flow Control | RTS/CTS, XON/XOFF (hardware and software) |
| On-Chip Regulator | 3.3 V LDO output |
| Internal Oscillator | Yes (48 MHz, no external crystal required) |
| Battery Charger Detect | Yes |
| Temperatura de funcionamiento | -40C to +85C |
| Encapsulado | QFN-20 (3x3 mm) |
| Tipo de montaje | Surface Mount |
| Número de pines | 20 |
| Estado RoHS | Compliant |
| Lead Free | Yes |
Configuración de pines de CP2102N-A02-GQFN20
| Pin 1 | VBUS — USB VBUS sense input (5 V tolerant) |
| Pin 2 | VDD — Supply voltage (3.0 V to 3.6 V) |
| Pin 3 | GND — Ground reference |
| Pin 4 | D+ — USB D+ data line (1.5 kOhm pull-up to 3.3 V) |
| Pin 5 | D- — USB D- data line |
| Pin 6 | VIO — I/O supply voltage reference |
| Pin 7 | TXD — UART transmit output (10 kOhm to GND for break signaling) |
| Pin 8 | RXD — UART receive input |
| Pin 9 | RTS — UART request-to-send (hardware flow control) |
| Pin 10 | CTS — UART clear-to-send (hardware flow control) |
| Pin 11 | GPIO.0 — Configurable GPIO 0 |
| Pin 12 | GPIO.1 — Configurable GPIO 1 |
| Pin 13 | GPIO.2 — Configurable GPIO 2 |
| Pin 14 | GPIO.3 — Configurable GPIO 3 |
| Pin 15 | SUSPEND — Suspend indicator output (active low) |
| Pin 16 | BC1.2 — Battery charger detect pin |
| Pin 17 | RESETn — Reset input (active low, internal pull-up) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | EPAD — Exposed thermal pad - tie to GND |
Aplicaciones típicas
CP2102N-A02-GQFN20 es adecuado para 6 aplicacións: USB-UART Debug Console for MCU Development Boards, Industrial Point-of-Sale (POS) Terminal Interfaces, Portable USB Medical Instrument Front-Ends, IoT Gateway USB Service Ports, Field-Upgradable Firmware Service Ports, USB Wireless Module Programming Dongles.
USB-UART Debug Console for MCU Development Boards
The CP2102N-A02-GQFN20's integrated USB 2.0 full-speed function controller, internal 48 MHz oscillator, and 3.3 V LDO make it ideal for MCU debug-console bridges on STM32, ESP32, and Nordic dev boards. Placed between the USB-C receptacle and the host MCU's UART pins, it enumerates as a Virtual COM Port (VCP) so engineers see a standard COM port on Windows/macOS/Linux without external components other than a few decoupling caps. The 4 GPIOs can drive status LEDs or strap configuration signals, and battery charger detect helps USB-powered boards implement BC1.2 detection. Parameter fit: 12 Mbps USB full-speed, 1 Mbaud UART, 3.0-3.6 V supply. Trade-off: the bridge adds BOM cost vs. a direct MCU with built-in USB, but eliminates USB-stack firmware development time.
Recomendado
Industrial Point-of-Sale (POS) Terminal Interfaces
POS terminals, receipt printers, and barcode scanners require a compact, reliable USB-to-UART link between the printer/scanner logic and the host terminal. The CP2102N-A02-GQFN20's 3x3 mm footprint and minimal external BOM (no crystal required) shrink the USB port module to under 50 mm^2. Its 4 GPIO pins can drive scanner trigger LEDs or sense tamper switches. The internal 3.3 V LDO can power small external logic; hardware flow control via RTS/CTS ensures lossless printing at 921600 baud. Parameter fit: industrial -40C to +85C temperature range, USB 2.0 full-speed with integrated transceiver. Trade-off: design requires VCP driver installation on the host, but this is standard for POS OS images.
Recomendado
Portable USB Medical Instrument Front-Ends
Portable medical instruments such as USB ECG leads, pulse-oximeter dongles, and spirometer adapters benefit from the CP2102N-A02-GQFN20's small footprint, low power consumption, and battery charger detect function. The bridge's battery charger detect enables a connected laptop to charge the device's battery when plugged in. Internal oscillator accuracy supports reliable 115200 baud telemedicine data streaming without external clock components. Parameter fit: 3.0-3.6 V single supply suited to single-cell Li-ion, integrated LDO powers MCU rail. Trade-off: medical designs still require isolation barriers for patient safety; the CP2102N sits behind the digital isolation.
Recomendado
IoT Gateway USB Service Ports
IoT gateways and edge routers expose a USB-C service port for field firmware updates and log retrieval. The CP2102N-A02-GQFN20 enumerates as a VCP port providing log data and acting as an update channel via XMODEM/YMODEM protocols. Its hardware XON/XOFF and RTS/CTS flow control prevents log drop-out at high baud rates. The 4 GPIOs can drive port-status LEDs, an ingress detection switch, or reset inputs. Parameter fit: 1024-byte UART buffer for bulk transfer, 1 Mbaud max rate. Trade-off: gate throughput is bounded by USB full-speed (12 Mbps) vs. USB 2.0 high-speed, but is more than adequate for service logs.
Recomendado
Field-Upgradable Firmware Service Ports
Many industrial controllers and motor drives include a USB service port for firmware updates during commissioning. The CP2102N-A02-GQFN20 provides this service-port function by emulating a COM port on the technician's laptop, allowing bootloader firmware pushes without opening the enclosure. The 4 GPIO pins can drive front-panel status LEDs directly; no external driver circuitry is required. Parameter fit: -40C to +85C industrial temperature grade, integrated 3.3 V regulator. Trade-off: VCP driver must be installed on the field technician's laptop, but Silicon Labs provides signed installers for Windows 10/11, macOS, and major Linux distributions.
Recomendado
USB Wireless Module Programming Dongles
Wireless module programming tools (for Bluetooth, Zigbee, LoRa, and proprietary radios) use the CP2102N-A02-GQFN20 to attach a host PC's COM port to a module's UART/boot pins. Battery charger detect adds BC1.2 compliance for powering the wireless module during programming. Its 3x3 mm QFN-20 enables socket PCBAs smaller than a USB-A connector. Parameter fit: 3.0-3.6 V supply matches most wireless module rails, GPIO-driven VIO for radios without 5 V tolerance. Trade-off: integrated USB only supports full-speed; Hi-Speed programming requires an FT-series bridge, but Wi-Fi/BLE firmware update sizes rarely need Hi-Speed.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para CP2102N-A02-GQFN20 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | CP2102N-A02-GQFN20R | CP2102N-A01-GQFN20 | CP2102N-A01-GQFN20R | CP2102-GMR |
|---|---|---|---|---|---|
| Package | QFN-20 (3x3 mm) | QFN-20 (3x3 mm) - same | QFN-20 (3x3 mm) - same | QFN-20 (3x3 mm) - same | QFN-28 - DIFFERENT |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Function | USB to UART Bridge | USB to UART Bridge | USB to UART Bridge | USB to UART Bridge | USB to UART Bridge |
| USB Specification | USB 2.0 Full-Speed (12 Mbps) | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| 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 3.6 V |
| Internal Oscillator | Yes (48 MHz) | Yes (48 MHz) | Yes (48 MHz) | Yes (48 MHz) | Yes |
| Revision | A02 (current) | A02 | A01 (phased out) | A01 (phased out) | Legacy CP2102 |
Diferenciadores clave
- A02 revision with active lifecycle and supply availability (frente a CP2102N-A01-GQFN20)
- Tape-and-reel packaging variant for SMT production lines (frente a CP2102N-A02-GQFN20R)
- Internal 48 MHz oscillator eliminates external crystal (frente a FT230XQ (different bridge))
Notas de diseño
Place a 4.7 uF low-ESR ceramic capacitor on the VBUS line and a 100 nF X7R capacitor close to the VDD pin (typically within 1-2 mm of the pad). The D+/D- traces must be routed as a 90-ohm differential pair with no stubs, matching per USB 2.0 full-speed specifications. The exposed thermal pad (pin 20) must be soldered to a continuous GND pour to meet thermal and electrical performance requirements.
An external 1.5 kOhm pull-up resistor must be present between the D+ line and 3.3 V to enable USB full-speed device detection; omitting this resistor will cause enumeration failures on USB hosts. Additionally, a 10 kOhm pull-down resistor is required between TXD and GND to support Send-Break UART signaling per the CP2102N datasheet, page section covering break transmission.
Keep digital GPIO traces away from the analog VDD line and the USB differential pair to minimize coupling noise. The GPIO.0 and GPIO.1 pins default to a tri-state mode for bus-powered self-powered selection; configure them via the Silicon Labs USBXpress configuration utility or ROM firmware. The RESETn pin has an internal pull-up, but for noisy industrial environments an external 10 kOhm pull-up plus 10 nF reset capacitor is recommended.
The USB 2.0 full-speed signaling eye diagram is sensitive to excessive capacitance on D+/D- lines. Total trace capacitance including connector and ESD diode must remain below 50 pF to maintain signal rise/fall times within the 20%-80% specification of 4-20 ns. Use a USB-IF-compliant ESD protection diode such as the SP3010 or PESD5V0L4UG placed near the USB connector, with stubs under 3 mm to the D+/D- lines.
Información de cumplimiento
RoHS and REACH compliant per Silicon Labs' product environmental compliance declarations. AEC-Q100 is not applicable to USB-UART bridge ICs used in industrial/commercial designs (not automotive-qualified). Use a different qualified bridge for automotive applications.
