CP2103-GMR

@@ -0,0 +1,69 @@+# CP2103-GMR++**SKYWORKS SILICON LABS** · USB Converters · QFN-28-EP(5x5)++CP2103-GMR from SKYWORKS SILICON LABS, in a QFN-28-EP(5x5). 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 | RI | input | Ring Indicator modem control input (active low). Marked as optional - may be left unconnected when not used. |+| 2 | GND | power_in | Ground. Must be tied to ground. |+| 3 | D+ | bidirectional | USB D+ differential data line. Connect directly to USB connector D+ (no external series resistor required). |+| 4 | D- | bidirectional | USB D- differential data line. Connect directly to USB connector D- (no external series resistor required). |+| 5 | VIO | power_in | I/O supply voltage input, 1.8 V to VDD. Sets the logic level for UART, GPIO, and control I/O so the CP2103 can interface to sub-3.3 V hosts. Tie to VDD if a separate I/O rail is not required. |+| 6 | VDD | power_in | 3.0-3.6 V core supply. Also serves as the output of the on-chip 3.3 V regulator when REGIN is driven from a 5 V source (see Section 9, Voltage Regulator). |+| 7 | REGIN | power_in | 5 V input to the internal LDO. Tie to VBUS when running from USB bus power; leave unconnected (or tie to VDD) in self-powered operation. |+| 8 | VBUS | input | VBUS sense input. Connect to the USB VBUS rail; a 5 V level indicates the device is attached to a USB host. |+| 9 | RST | bidirectional | Active-low device reset. Open-drain output of the internal power-on-reset / VDD monitor; an external source may pull this pin low for at least 15 µs to initiate a system reset. |+| 10 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 11 | SUSPEND | output | Active-low suspend indicator. Driven low when the CP2103 enters the USB suspend state. Marked optional - may be left unconnected when not used. |+| 12 | SUSPEND | output | Active-high suspend indicator. Driven high when the CP2103 enters the USB suspend state. Marked optional - may be left unconnected when not used. |+| 13 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 14 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 15 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 16 | GPIO.3 | bidirectional | User-configurable digital I/O. Alternate functions (e.g., RS-485 transceiver enable, status LEDs, hardware suspend flag) are assigned via the on-chip EEPROM. |+| 17 | GPIO.2 | bidirectional | User-configurable digital I/O. Alternate functions (e.g., RS-485 transceiver enable, status LEDs) are assigned via the on-chip EEPROM. |+| 18 | GPIO.1 | bidirectional | User-configurable digital I/O. Alternate functions (e.g., RS-485 transceiver enable, status LEDs) are assigned via the on-chip EEPROM. |+| 19 | GPIO.0 | bidirectional | User-configurable digital I/O. Alternate functions (e.g., RS-485 transceiver enable, status LEDs) are assigned via the on-chip EEPROM. |+| 20 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 21 | NC | unconnected | No connect. Leave unconnected or tie to VDD. |+| 22 | CTS | input | Clear-To-Send modem control input (active low). Marked optional - may be left unconnected when hardware handshaking is not used. |+| 23 | RTS | output | Request-To-Send modem control output (active low). Marked optional - may be left unconnected when hardware handshaking is not used. |+| 24 | RXD | input | Asynchronous UART receive data input. |+| 25 | TXD | output | Asynchronous UART transmit data output. |+| 26 | DSR | input | Data-Set-Ready modem control input (active low). Marked optional - may be left unconnected when not used. |+| 27 | DTR | output | Data-Terminal-Ready modem control output (active low). Marked optional - may be left unconnected when not used. |+| 28 | DCD | input | Data-Carrier-Detect modem control input (active low). Marked optional - may be left unconnected when not used. |+| EP | SGND | power_in | Signal ground / exposed center pad of the QFN-28 package. Must be soldered to the PCB ground plane for both electrical ground return and thermal dissipation. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | SKYWORKS SILICON LABS |+| Package | QFN-28-EP(5x5) |+| Category | Interface |+| Pins | 29 |++## Ordering variants++- `CP2103-GMRGM`+- `CP2103-GMRGMR`++## CAD (KiCad official)++- Symbol: `CP2103-GMR`+- Footprint: `Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.35x3.35mm`+- 3D model: QFN-28-EP(5x5) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [SKYWORKS SILICON LABS datasheet](docs/cp2103-gmr-datasheet.pdf) (20 pp, sha256 `1b1ae8e977966c33`, 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).++[Datasheet PDF](docs/cp2103-gmr-datasheet.pdf)

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