CP2108-B03-GMR - USB to Quad UART Bridge, QFN-64 | Silicon Labs
料号： CP2108-B03-GMR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.32 | $7.32 |
| 10 | $6.59 | $65.90 |
| 100 | $5.86 | $586.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.61 | $4,610.00 |
CP2108-B03-GMR 概述
A USB-to-UART bridge is a device-class converter that translates USB packets into asynchronous serial frames, enabling legacy RS-232/RS-485 peripherals, sensors, and microcontrollers to communicate with a modern host that has dropped legacy COM ports. Within the broader interface IC taxonomy, the CP2108 sits in the bus bridge sub-category (USB bridge -> bridge IC -> interface IC -> integrated circuit), using the USB Communications Device Class (CDC) on the host side and a transparent UART on the device side to eliminate firmware-side protocol stacks.
Key features include four independent UART channels each supporting hardware flow control (RTS/CTS), programmable baud rates from 300 bps to 921.6 kbps, on-chip EEPROM for custom VID/PID and product-string storage, and a built-in 3.3 V LDO that can supply external logic up to 100 mA. The internal clock generator removes the need for an external crystal, and an integrated power-on reset circuit ensures clean enumeration even on noisy USB VBUS rails.
Typical applications cover industrial multi-port serial hubs, point-of-sale terminals with cash drawer / scanner / barcode-reader / printer ports, RS-232/RS-485 field-service dongles, multi-drop Modbus gateways, and test-and-measurement fixtures that aggregate several UART instruments onto one USB port. The combination of four independent UARTs, a CDC driver stack provided by Silicon Labs, and BOM-saving integration reduces PCB area and BOM cost versus building four CP2102 bridges.
Designers should pay attention to USB 2.0 signal-integrity on the upstream port - keep the D+/D- traces 90 ohm differential, length-matched, and routed over a continuous reference plane. The internal 3.3 V LDO is intended for light logic-rail loads; do not power RF stages from REG3V3. Suspend current is well below the USB 2.0 specification, so bus-powered designs typically pass gold-tree compliance without extra load switches.
直接替换替代料： CP2108-B03-GMR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： CP2108-B03-GMR （相同外形与封装尺寸） ——差异在于 Package, RoHS Status, Supply Voltage, Flow Control, Integrated Functions.
快速对比工具——选择替代料号进行并排对比：
CP2108-B03-GM
✅ 直接替换✓ 有现货
$3.7973 / 个
查看数据手册 →CP2108-B01-GMR
✅ 直接替换✓ 有现货
$4.35 / 个
查看数据手册 →CP2108-B03-GMR 规格参数
| 功能 | USB to Quad UART Bridge Controller |
| Protocol | USB 2.0 Full-Speed |
| UART Channels | 4 |
| 电源电压 | 3.0 V to 3.6 V |
| Baud Rate | 300 bps to 921.6 kbps (per UART) |
| Data Bits | 5, 6, 7, 8 bits |
| Parity | None, Even, Odd, Mark, Space |
| Stop Bits | 1, 1.5, 2 |
| Flow Control | Hardware (RTS/CTS) and Software (XON/XOFF) per UART |
| Modem Control Signals | Full (DTR, DSR, RTS, CTS, DCD, RI) per channel |
| Internal Oscillator | Yes (crystal-less USB operation) |
| Internal LDO | 3.3 V output, up to 100 mA for external logic |
| On-chip EEPROM | Yes (VID, PID, serial number, product string, GPIO configuration) |
| GPIO | Configurable multi-IO pins (revision B03 feature) |
| 工作温度 | -40 C to +85 C |
| 封装 / 外壳 | 64-QFN (9 mm x 9 mm) |
| Supplier Device Package | 64-QFN 9 x 9 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (per manufacturer page) |
CP2108-B03-GMR 64-qfn 9 x 9 引脚配置指南
CP2108-B03-GMR（64-qfn 9 x 9 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： CP2108-B03-GMR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
CP2108-B03-GMR 适用于 6 应用s: Industrial Multi-Port Serial Hub, Point-of-Sale (POS) Terminal Backplane, USB-to-RS-485 Field-Service Dongle, Test and Measurement Instrument Aggregation, Multi-Drop RS-485 Sensor Gateway, USB CDC Industrial Console Server.
Industrial Multi-Port Serial Hub
The CP2108-B03-GMR's four independent UARTs with full modem control make it ideal for industrial serial hubs that aggregate Modbus RTU, RS-232 instruments, and RS-485 sensors onto one upstream USB port. Each channel supports hardware flow control (RTS/CTS) up to 921.6 kbps, so a single upstream USB 2.0 link reliably expands into four galvanically-isolated downstream ports without protocol multiplexing.
推荐
Point-of-Sale (POS) Terminal Backplane
POS systems need simultaneous links to barcode scanners, cash drawers, magnetic-stripe readers, and receipt printers - four downstream devices that traditionally required multiple bridge ICs. The CP2108-B03-GMR consolidates those four UARTs into one 9x9 mm QFN with internal 3.3 V LDO, shrinking the backplane BOM. The internal oscillator also eliminates the crystal, easing USB certification on the wide-VBUS supplies common in retail hubs.
推荐
USB-to-RS-485 Field-Service Dongle
Field-service technicians running Modbus SCADA diagnostics frequently need a pocket-sized USB stick with four isolated RS-485 ports - the CP2108-B03-GMR delivers that in one chip without a crystal. Each UART's programmable baud generator plus the on-chip 64-byte FIFO keeps host CPU overhead low even when four Modbus masters are polled concurrently. Revision B03's multi-IO GPIO simplifies direction-control and fault-indicator lines without an extra IO expander.
推荐
Test and Measurement Instrument Aggregation
ATE fixtures that previously stacked four CP2102 single-UART bridges can replace them with one CP2108-B03-GMR, saving 60% of the bridge-related PCB area. Each independent 921.6 kbps UART combined with the Silicon Labs VCP driver means existing test scripts written for COM ports work unchanged while the host sees COM7 through COM10. On-chip EEPROM stores custom VID/PID so multiple dongles enumerate with unique serial numbers.
推荐
Multi-Drop RS-485 Sensor Gateway
Multi-drop RS-485 gateways serving 32+ sensor nodes per channel benefit from the CP2108-B03-GMR's ability to host four parallel RS-485 buses via attached transceivers, multiplying the per-gateway node count by 4x. Revision B03's configurable GPIOs handle per-channel DE/RE control and link-activity LEDs without external glue logic. The internal 3.3 V LDO powers those transceivers directly, simplifying battery-backed sensor node field installations.
推荐
USB CDC Industrial Console Server
Console servers for switches, routers, and PLCs typically expose 4-16 RJ-45 serial ports via USB to the host; the CP2108-B03-GMR provides the first four channels without needing an FPGA mux. Combined with the Silicon Labs CDC driver, the resulting out-of-the-box COM port visibility shortens field-deployment time and avoids the licensing cost of vendor-specific drivers. Revision B03 GPIOs feed per-port status LEDs and link-detect logic with no extra IO expander.
推荐
推荐产品汇总
工程参考数据： CP2108-B03-GMR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CP2108-B03-GM | CP2108-B01-GMR |
|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - identical | 64-QFN (9x9 mm) - identical |
| UART Channels | 4 | 4 | 4 |
| USB Standard | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| Maximum Baud Rate | 921.6 kbps | 921.6 kbps | 921.6 kbps |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Internal LDO | 3.3 V / 100 mA | 3.3 V / 100 mA | 3.3 V / 100 mA |
| Revision / GPIO Mapping | B03 with multi-IO GPIO configuration | B03 with multi-IO GPIO configuration | B01 with legacy GPIO mapping |
| Shipping Packaging | 1000-piece reel (GMR suffix) | 100-piece tray (GM suffix) | 1000-piece reel (GMR suffix) |
| Lifecycle Status | Active | Active | Active (older revision) |
关键差异点
- Revision B03 multi-IO GPIO configuration （对比 CP2108-B01-GMR)
- 1000-piece reel packaging for SMT lines （对比 CP2108-B03-GM)
- Internal 3.3 V LDO with 100 mA budget （对比 CP2102-GMR (single UART bridge))
设计说明
Lay out the upstream USB D+ and D- traces as a 90 ohm differential pair, length-matched within 150 mil, routed over a continuous ground reference plane on layer 2. Place the VBUS bypass cap within 100 mil of the VBUS pin. The internal 3.3 V LDO is intended for light loads (<=100 mA) - do not power RF transceivers from REG3V3.
Estimated: with four UARTs at 921.6 kbps simultaneously, total host-side interrupt rate is approximately 73 kHz per channel. The CP2108's 64-byte hardware FIFO per channel means most desktop-class hosts can sustain full-throughput across all four channels without flow-control pauses; verify with the Silicon Labs AN721 application note on multi-port throughput.
Avoid mixing CP2108 PCB designs with USB 3.0 SuperSpeed stacks - the device only operates at 12 Mbps Full-Speed, and on a hub downstream port with USB 2.0 signalling the device will enumerate correctly. Ensure the upstream port is not forced to USB 3.0-only mode via host policy. Drivers are bundled with Silicon Labs' CP210x VCP package on Windows; macOS and Linux include in-box CDC-ACM drivers.
合规信息
RoHS and REACH compliance per Silicon Labs product page and PCN 170713107 (revision B03). No AEC-Q100 automotive grade is offered - choose CP2102N-A01-GQFN28R for AEC-Q100 USB-UART applications. Halogen-free status not explicitly published in the verified data.
