component
CP2105-F01-GMR
Public Unreviewedby Ray
SKYWORKS SILICON LABS USB Converters, QFN-24-EP(4x4). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCP2105-F01-GMR
SKYWORKS SILICON LABS · USB Converters · QFN-24-EP(4x4)
CP2105-F01-GMR from SKYWORKS SILICON LABS, in a QFN-24-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SUSPEND/RI_SCI | bidirectional | In GPIO mode, active-low (default) USB Suspend status output; polarity configurable via PROM. In modem-control mode, active-low Ring Indicator (RI) input for the Standard Comm Interface (SCI). |
| 2 | GND | power_in | Ground reference. Must be tied to ground. The QFN center pad is also optionally tied to GND. |
| 3 | D+ | bidirectional | USB D+ full-speed (12 Mbps) differential data line. Integrated pull-up; no external series resistor required. |
| 4 | D- | bidirectional | USB D- full-speed (12 Mbps) differential data line. Integrated transceiver; no external series resistor required. |
| 5 | VIO | power_in | I/O supply voltage input, 1.8 V to VDD. Sets the logic-level reference for the UART/GPIO/RST pins. |
| 6 | VDD | power_in | Digital supply voltage input, 3.0 to 3.6 V. Can be driven by the internal regulator output or an external 3.3 V rail. |
| 7 | REGIN | power_in | 5 V input to the on-chip voltage regulator, 3.0 to 5.25 V. Regulator output is 3.45 V typ, up to 100 mA. |
| 8 | VBUS | input | USB VBUS sense input. Connect to the VBUS line of the USB connector; detection threshold 2.5 V. |
| 9 | RST | bidirectional | Device Reset. Open-drain output of the internal POR / VDD monitor; drive low externally for at least 15 us to force a system reset. Active low. |
| 10 | CTS_ECI | input | Enhanced Comm Interface Clear-To-Send hardware flow-control input, active low. May be left unconnected when unused. |
| 11 | RTS_ECI | output | Enhanced Comm Interface Ready-To-Send hardware flow-control output, active low. |
| 12 | RXD_ECI | input | Enhanced Comm Interface asynchronous UART receive data input. Baud rates 300 bps to 2.0 Mbps. |
| 13 | TXD_ECI | output | Enhanced Comm Interface asynchronous UART transmit data output. Baud rates 300 bps to 2.0 Mbps. |
| 14 | GPIO.1_ECI/DSR_ECI | bidirectional | In GPIO mode, a user-configurable I/O for the Enhanced Comm Interface. In modem-control mode, the active-low Data Set Ready (DSR) input for the ECI. |
| 15 | GPIO.0_ECI/DTR_ECI | bidirectional | In GPIO mode, a user-configurable I/O for the Enhanced Comm Interface. In modem-control mode, the active-low Data Terminal Ready (DTR) output for the ECI. |
| 16 | NC/DCD_ECI/VPP | bidirectional | In GPIO mode, unused (NC). In modem-control mode, active-low Data Carrier Detect (DCD) input for the ECI. Additionally serves as VPP for OTP-ROM programming when a 4.7 uF capacitor is connected to GND; during programming VPP = 5.75 V min. |
| 17 | SUSPEND/RI_ECI | bidirectional | In GPIO mode, active-low (default) USB Suspend status output; polarity configurable via PROM. In modem-control mode, active-low Ring Indicator (RI) input for the Enhanced Comm Interface. |
| 18 | CTS_SCI | input | Standard Comm Interface Clear-To-Send hardware flow-control input, active low. |
| 19 | RTS_SCI | output | Standard Comm Interface Ready-To-Send hardware flow-control output, active low. |
| 20 | RXD_SCI | input | Standard Comm Interface asynchronous UART receive data input. Baud rates 2400 bps to 921600 bps. |
| 21 | TXD_SCI | output | Standard Comm Interface asynchronous UART transmit data output. Baud rates 2400 bps to 921600 bps. |
| 22 | GPIO.2_SCI/DSR_SCI | bidirectional | In GPIO mode, a user-configurable I/O for the Standard Comm Interface. In modem-control mode, the active-low Data Set Ready (DSR) input for the SCI. |
| 23 | GPIO.1_SCI/DTR_SCI | bidirectional | In GPIO mode, a user-configurable I/O for the Standard Comm Interface. In modem-control mode, the active-low Data Terminal Ready (DTR) output for the SCI. |
| 24 | GPIO.0_SCI/DCD_SCI | bidirectional | In GPIO mode, a user-configurable I/O for the Standard Comm Interface. In modem-control mode, the active-low Data Carrier Detect (DCD) input for the SCI. |
| 25 | GND_PAD | power_in | Exposed thermal/center pad on the QFN-24 package. Optional connection to GND; recommended for improved thermal performance and grounding. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SKYWORKS SILICON LABS |
| Package | QFN-24-EP(4x4) |
| Category | Interface |
| Pins | 25 |
Ordering variants
Same part, different packaging or reel option.
CP2105-F01-GMR
CAD (KiCad official)
- Symbol:
CP2105-F01-GMR - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SKYWORKS SILICON LABS datasheet (24 pp, sha256
f46ab66681188a77, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).