CP2102N-A02-GQFN28 USB-to-UART Bridge, QFN28 | Silicon Labs
N.º da peça: CP2102N-A02-GQFN28 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.94 | $3,94 |
| 10 | $3.55 | $35,50 |
| 100 | $2.95 | $295,00 |
| 500 | $2.6 | $1.300,00 |
| 1.000 | $2.35 | $2.350,00 |
CP2102N-A02-GQFN28 Visão geral
A USB-to-UART bridge is a class of interface IC that converts USB signaling on the host side to asynchronous serial (UART) signaling on the device side, eliminating the need for firmware-side USB stack development. Bridges sit in the interface-IC taxonomy between USB transceivers and protocol converters, and they are commonly used as drop-in serial-port replacements on embedded designs.
Key features include 7 configurable digital I/O pins, FIFO buffers, hardware flow control (RTS/CTS), power-on reset, suspend and resume signaling, and GPIO that can be controlled through the Silicon Labs VCP/Silicon Labs USBXpress host drivers. The integrated 3.3 V LDO can supply up to 100 mA to external circuitry, which is sufficient for low-current companion logic. The A02 silicon revision is the production-current revision per Silicon Labs AN1505 and the CP2102N datasheet.
Architecturally, the device combines an on-chip USB 2.0 full-speed PHY, a hardware UART engine, a one-time-programmable ROM (960 bytes), and an integrated clock and regulator. This high level of integration lets a designer add a COM port to any embedded system using only the CP2102N, a USB connector, and four decoupling capacitors, with no firmware USB stack required when the host-side VCP driver is used.
Typical applications include industrial sensor modules, point-of-sale terminals, USB-to-RS232 adapters, USB-to-RS485 dongles, embedded debug consoles, and any microcontroller-based product that needs to expose a virtual COM port to a PC. Compared to the legacy CP2102-GM (QSSOP-28), the CP2102N-A02-GQFN28 delivers faster baud rates (3 Mbaud vs 921 kbps on CP2102-GM), tighter integration, and lower BOM count.
Design consideration: place the VBUS, VDD, and VIO decoupling caps within 2 mm of their respective pins, and route the USB DP/DM traces as a 90 ohm differential pair. The internal regulator cannot be bypassed; for self-powered designs add the voltage divider shown in Silicon Labs AN1505.
This page consolidates distributor pricing, drop-in alternatives (CP2102N-A01-GQFN28, CP2102N-A02-GQFN28R, CP2102C-A01-GQFN28), and PCB design notes not aggregated on a single manufacturer datasheet page.
Alternativas drop-in para CP2102N-A02-GQFN28 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com CP2102N-A02-GQFN28 (mesmo formato e footprint) — diferindo em Package, Internal Regulator Output, Operating Temperature, Product Type, Supply Voltage (VDD).
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
CP2102N-A01-GQFN28R
✓ Em estoque
$2.31 / unidade
Ver ficha técnica →CP2102N-A02-GQFN28R
✓ Em estoque
$2.35 / unidade
Ver ficha técnica →CP2102C-A01-GQFN28
📋 Alternativa de referência (fora do catálogo)
CP2102N-GQFN24
📋 Alternativa de referência (fora do catálogo)
CP2102N-A02-GQFN28 Especificações
| Função | USB 2.0 to UART Bridge Controller |
| Protocol | USB 2.0 Full-Speed |
| Supply Voltage (VDD) | 3 V to 3.6 V |
| I/O Voltage (VIO) | 1.8 V to VDD |
| Maximum Baud Rate | 3 Mbaud |
| USB Speed | Full-Speed (12 Mbps) |
| Digital I/O Pins | 7 |
| Internal Regulator Output | 3.3 V |
| Internal Regulator Current | Up to 100 mA (external load) |
| Internal Oscillator | 48 MHz (no external crystal required) |
| ROM for Descriptors | 960 bytes (one-time programmable) |
| UART Data Bits | 5, 6, 7, or 8 (programmable) |
| Hardware Flow Control | RTS/CTS supported |
| Encapsulamento | QFN-28 (5x5 mm) |
| Tipo de montagem | Surface Mount |
| Temperatura de operação | -40C to +85C |
| Status RoHS | Compliant |
Configuração de pinos do CP2102N-A02-GQFN28
| Pino 1 | VBUS — USB VBUS sense input (4.0 V to 5.5 V) |
| Pino 2 | DCD — UART DCD signal / GPIO |
| Pino 3 | DSR — UART DSR signal / GPIO |
| Pino 4 | DTR — UART DTR signal / GPIO |
| Pino 5 | RTS — UART RTS signal / GPIO |
| Pino 6 | CTS — UART CTS signal / GPIO |
| Pino 7 | RI — UART RI signal / GPIO |
| Pino 8 | GPIO0 — General-purpose I/O 0 |
| Pino 9 | GPIO1 — General-purpose I/O 1 |
| Pino 10 | VBAT — Regulator bypass / battery sense |
| Pino 11 | VDD — Supply 3.0 V to 3.6 V |
| Pino 12 | GPIO2 — General-purpose I/O 2 |
| Pino 13 | VIO — I/O supply 1.8 V to VDD |
| Pino 14 | GND — Ground |
| Pino 15 | RESETb — Reset input (active low) |
| Pino 16 | D+ — USB D+ data line |
| Pino 17 | D- — USB D- data line |
| Pino 18 | GPIO3 — General-purpose I/O 3 |
| Pino 19 | TXD — UART transmit output |
| Pino 20 | RXD — UART receive input |
| Pino 21 | GPIO4 — General-purpose I/O 4 |
| Pino 22 | GPIO5 — General-purpose I/O 5 |
| Pino 23 | GPIO6 — General-purpose I/O 6 |
| Pino 24 | NC — Not connected (per datasheet) |
| Pino 25 | NC — Not connected (per datasheet) |
| Pino 26 | NC — Not connected (per datasheet) |
| Pino 27 | NC — Not connected (per datasheet) |
| Pino 28 | ePAD — Exposed thermal pad (connect to GND) |
Aplicações típicas
CP2102N-A02-GQFN28 é adequado para 7 aplicaçãos: USB-to-Virtual-COM-Port Module, Industrial Sensor-to-USB Adapter, Point-of-Sale (POS) Terminal Bridge, USB-to-RS485 Dongle, Embedded Debug Console, IoT Gateway USB Console Header, USB Isolated Serial Adapter.
USB-to-Virtual-COM-Port Module
The CP2102N-A02-GQFN28 is purpose-designed as a USB-to-virtual-COM-port bridge: the part installs on a small PCB with a USB Type-B or Micro-B connector and exposes a UART to a host microcontroller, exposing a Windows/macOS/Linux VCP via the Silicon Labs VCP driver. The 3 Mbaud maximum baud rate and integrated 48 MHz oscillator make it ideal for high-throughput debug consoles; the integrated 3.3 V/100 mA LDO can supply external logic. Compared to a discrete USB PHY plus microcontroller, the CP2102N-A02 reduces BOM count to one IC and four decoupling capacitors.
Recomendado
Industrial Sensor-to-USB Adapter
Industrial sensor modules with UART or RS-232 outputs use the CP2102N-A02-GQFN28 to bridge to USB for direct PC connection. The part's industrial-grade USB supply range (3.0-3.6 V) and integrated ESD-protected USB DP/DM pins tolerate factory-floor wiring. The 7 GPIO pins can drive status LEDs or handshake lines, and the hardware-flow-control RTS/CTS pins prevent FIFO overruns at 3 Mbaud. The QFN-28 5x5 mm footprint fits inside IP67-sealed enclosures where QSSOP-28 parts (e.g., CP2102-GM) cannot.
Recomendado
Point-of-Sale (POS) Terminal Bridge
POS terminals and EFT-PIN pads use the CP2102N-A02-GQFN28 to bridge the secure-element UART to a USB host for firmware update and diagnostics. The part's hardware-flow-control RTS/CTS pins preserve byte-exact protocol timing, while the integrated 3.3 V LDO can power the secure-element's VCC rail. Compared to RS-232 adapters, the CP2102N-A02 eliminates the bulky DB-9 connector and the +/-12 V charge-pump, reducing PCB area by ~70 percent for compact handheld POS hardware.
Recomendado
USB-to-RS485 Dongle
USB-to-RS485 dongles pair the CP2102N-A02-GQFN28 with a half-duplex RS-485 transceiver such as the ADM3072EARZ or ISL3179E to convert USB to differential RS-485 for industrial fieldbus networks. The CP2102N-A02's hardware-flow-control RTS/CTS pins drive the RS-485 DE/RE direction-control pin, enabling automatic bus turnaround. The 3 Mbaud UART throughput exceeds the maximum RS-485 practical rate of 10 Mbaud only via specialized drivers, but supports Modbus RTU at 115.2 kbaud with ample margin.
Recomendado
Embedded Debug Console
The CP2102N-A02-GQFN28 is widely used as an embedded debug-console bridge: connect a microcontroller's UART to the CP2102N-A02's RXD/TXD pins, route the USB D+/D- to a Type-C connector, and the host PC sees a virtual COM port via the Silicon Labs VCP driver. The 3 Mbaud rate supports printf-style debug at 921600 baud with margin. The integrated 48 MHz oscillator eliminates crystal routing on tight debug boards, and the 7 GPIO pins can carry reset, bootloader-mode, and LED signals.
Recomendado
IoT Gateway USB Console Header
IoT gateways (Wi-Fi, LoRa, Zigbee, Matter) frequently expose a USB Type-C debug header using the CP2102N-A02-GQFN28. The part's 3.0-3.6 V VDD matches the 3.3 V rails used across most IoT SoCs, and the integrated 3.3 V/100 mA LDO can power external level-shifters or LEDs. The 7 GPIO pins can carry bootloader-mode strapping, factory-reset, and LED-status signals. Compared to the legacy CP2102-GM (QSSOP-28), the QFN-28 footprint saves roughly 60 percent PCB area for compact gateways.
Recomendado
USB Isolated Serial Adapter
Medical and process-automation equipment places the CP2102N-A02-GQFN28 behind a digital isolator (such as ADuM4160 or ADuM141E) to provide 5 kV galvanic isolation between the USB host and a UART peripheral. The CP2102N-A02's integrated USB handling keeps the host-side BOM minimal, while the isolator's low propagation supports the full 3 Mbaud. Compared to non-isolated bridges, the rise is roughly 4 BOM ICs, but enables IEC 60601-1 medical isolation requirements.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para CP2102N-A02-GQFN28 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | CP2102N-A02-GQFN28R | CP2102N-A01-GQFN28R | CP2102C-A01-GQFN28 | CP2102N-GQFN24 |
|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | QFN-28 (5x5 mm) | QFN-28 (5x5 mm) - same | QFN-28 (5x5 mm) - same | QFN-28 (5x5 mm) - same | QFN-24 (4x4 mm) - smaller |
| Maximum Baud Rate | 3 Mbaud | 3 Mbaud | 3 Mbaud | 3 Mbaud | 3 Mbaud |
| Supply Voltage (VDD) | 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 |
| Digital I/O Pins | 7 | 7 | 7 | 7 | 4 |
| Silicon Revision | A02 (production current) | A02 (production current) | A01 (earlier, superseded) | CP2102C family successor | A02 |
| Internal 3.3 V LDO Current | Up to 100 mA | Up to 100 mA | Up to 100 mA | Up to 100 mA | Up to 100 mA |
| Tape-and-Reel Packaging | Tray / cut tape (GQFN28) | Tape-and-reel (-R suffix, factory pack 1500) | Tape-and-reel (-R suffix) | Tray or tape-and-reel | Tray or tape-and-reel |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant |
Principais diferenciais
- Integrated USB 2.0 PHY plus 3.3 V LDO in QFN-28 (vs FTDI FT232R)
- 3 Mbaud maximum UART rate (vs 921 kbps on legacy CP2102-GM) (vs CP2102-GM)
- A02 silicon revision is current-production per AN1505 (vs CP2102N-A01-GQFN28R)
- Pin-compatible successor CP2102C-A01-GQFN28 with USBXpress driver continuity (vs CP2102C-A01-GQFN28)
Notas de projeto
Place 1uF and 0.1uF decoupling capacitors on VBUS, VDD, VIO, and VBAT within 2 mm of their respective pins. Route the USB DP (16) and DP (17) traces as a 90-ohm differential pair with matched length and no stubs. Keep the exposed thermal pad (ePAD, pin 28) soldered to a continuous ground plane for thermal and electrical reference.
The internal 3.3 V LDO can supply up to 100 mA to external loads. For bus-powered designs the LDO derives power from VBUS; for self-powered designs where the host is not always present, ensure the LDO is decoupled per the datasheet typical application circuit. The CP2102C-A01-GQFN28 successor requires an additional bus-powered voltage divider on D+/D- per Silicon Labs AN1505 figure 1.1; the CP2102N-A02 does not.
Do not exceed the maximum VBUS of 5.5 V; add a 5.1 V TVS diode on VBUS for hot-plug protection in industrial environments. The internal regulator cannot be bypassed; do not apply external 3.3 V to VIO when VDD is below 3.0 V. For suspended USB states the VIO current drops below 100 uA, but the regulator still requires its output capacitor to maintain stability. Do not apply external pull-ups on DP/DM - the CP2102N integrates the 1.5 kohm pull-up on D+ internally.
USB DP/DM traces must be 90-ohm differential impedance with no more than one via per line in compact QFN-28 boards. Place the CP2102N within 5 mm of the USB Type-B or Micro-B connector; long stub traces degrade USB signal integrity. The RESETb pin (15) requires an external 10 kohm pull-up to VIO and a 1 nF cap to GND for proper power-on reset behavior per CP2102N datasheet section 4.
Estimated: at full UART activity (3 Mbaud continuous) the CP2102N-A02-GQFN28 typically draws ~25 mA from VDD, yielding ~75 mW dissipation at 3.3 V VDD. The QFN-28 5x5 mm package with ePAD has theta_JA around 35 C/W on a 1-oz 4-layer PCB, giving a junction-temperature rise of ~2.6 C above ambient at full UART load. No heatsink is required; ensure the ePAD is soldered to the GND plane for thermal spreading.
Informações de conformidade
RoHS and REACH compliant per Silicon Labs product page. Not AEC-Q100 qualified - choose AEC-Q100 qualified alternatives for automotive applications. USB 2.0 full-speed compliant per USB-IF.
