C8051F340-GQR from SKYWORKS SILICON LABS, in a TQFP-48(7x7). 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	P0.5	bidirectional	Port 0.5 - digital I/O or analog input. 5 V tolerant, configurable through the crossbar and priority decoder.
2	P0.4	bidirectional	Port 0.4 - digital I/O or analog input. 5 V tolerant.
3	P0.3	bidirectional	Port 0.3 - digital I/O or analog input. 5 V tolerant.
4	P0.2	bidirectional	Port 0.2 - digital I/O or analog input. 5 V tolerant.
5	P0.1	bidirectional	Port 0.1 - digital I/O or analog input. 5 V tolerant.
6	P0.0	bidirectional	Port 0.0 - digital I/O or analog input. 5 V tolerant.
7	GND	power_in	Ground return for all supplies and I/Os.
8	D+	bidirectional	USB 2.0 full-speed/low-speed D+ line. Integrated transceiver requires no external series/termination resistors.
9	D-	bidirectional	USB 2.0 full-speed/low-speed D- line. Integrated transceiver requires no external series/termination resistors.
10	VDD	power_in	2.7-3.6 V power supply input, OR 3.3 V output of the on-chip voltage regulator when powered via REGIN. Bypass with 1 µF + 0.1 µF to GND.
11	REGIN	power_in	5 V input to the on-chip voltage regulator that generates VDD. Leave unused or tied to VDD when operating directly from a 2.7-3.6 V rail on VDD.
12	VBUS	input	USB VBUS sense input. Connect to the USB cable VBUS (nominal 5 V) so firmware/hardware can detect host attach.
13	/RST/C2CK	bidirectional	Device reset (open-drain output of internal POR/VDD monitor; external source may reset by pulling low ≥15 µs) and C2 debug interface clock. Requires an external pull-up for reset use.
14	C2D	bidirectional	Bi-directional data signal for the C2 debug/programming interface.
15	P4.7	bidirectional	Port 4.7 - digital I/O. 5 V tolerant, high-sink capable, assignable through the crossbar.
16	P4.6	bidirectional	Port 4.6 - digital I/O. 5 V tolerant.
17	P4.5	bidirectional	Port 4.5 - digital I/O. 5 V tolerant.
18	P4.4	bidirectional	Port 4.4 - digital I/O. 5 V tolerant.
19	P4.3	bidirectional	Port 4.3 - digital I/O. 5 V tolerant.
20	P4.2	bidirectional	Port 4.2 - digital I/O. 5 V tolerant.
21	P4.1	bidirectional	Port 4.1 - digital I/O. 5 V tolerant.
22	P4.0	bidirectional	Port 4.0 - digital I/O. 5 V tolerant.
23	P3.7	bidirectional	Port 3.7 - digital I/O or analog input. 5 V tolerant.
24	P3.6	bidirectional	Port 3.6 - digital I/O or analog input. 5 V tolerant.
25	P3.5	bidirectional	Port 3.5 - digital I/O or analog input. 5 V tolerant.
26	P3.4	bidirectional	Port 3.4 - digital I/O or analog input. 5 V tolerant.
27	P3.3	bidirectional	Port 3.3 - digital I/O or analog input. 5 V tolerant.
28	P3.2	bidirectional	Port 3.2 - digital I/O or analog input. 5 V tolerant.
29	P3.1	bidirectional	Port 3.1 - digital I/O or analog input. 5 V tolerant.
30	P3.0	bidirectional	Port 3.0 - digital I/O or analog input. 5 V tolerant.
31	P2.7	bidirectional	Port 2.7 - digital I/O or analog input. 5 V tolerant.
32	P2.6	bidirectional	Port 2.6 - digital I/O or analog input. 5 V tolerant.
33	P2.5	bidirectional	Port 2.5 - digital I/O or analog input. 5 V tolerant.
34	P2.4	bidirectional	Port 2.4 - digital I/O or analog input. 5 V tolerant.
35	P2.3	bidirectional	Port 2.3 - digital I/O or analog input. 5 V tolerant.
36	P2.2	bidirectional	Port 2.2 - digital I/O or analog input. 5 V tolerant.
37	P2.1	bidirectional	Port 2.1 - digital I/O or analog input. 5 V tolerant.
38	P2.0	bidirectional	Port 2.0 - digital I/O or analog input. 5 V tolerant.
39	P1.7	bidirectional	Port 1.7 - digital I/O or analog input. 5 V tolerant.
40	P1.6	bidirectional	Port 1.6 - digital I/O or analog input. 5 V tolerant.
41	P1.5	bidirectional	Port 1.5 - digital I/O or analog input. 5 V tolerant.
42	P1.4	bidirectional	Port 1.4 - digital I/O or analog input. 5 V tolerant.
43	P1.3	bidirectional	Port 1.3 - digital I/O or analog input. 5 V tolerant.
44	P1.2	bidirectional	Port 1.2 - digital I/O or analog input. 5 V tolerant.
45	P1.1	bidirectional	Port 1.1 - digital I/O or analog input. 5 V tolerant.
46	P1.0	bidirectional	Port 1.0 - digital I/O or analog input. 5 V tolerant.
47	P0.7	bidirectional	Port 0.7 - digital I/O or analog input. 5 V tolerant.
48	P0.6	bidirectional	Port 0.6 - digital I/O or analog input. 5 V tolerant.

Key specifications

Parameter	Value
Manufacturer	SKYWORKS SILICON LABS
Package	TQFP-48(7x7)
Category	MCU
Pins	48

Ordering variants

C8051F340-GQR
C8051F340-GQRC8051F341-GQ
C8051F340-GQRC8051F344-GQ
C8051F340-GQRC8051F345-GQ
C8051F340-GQRC8051F342-GQ
C8051F340-GQRC8051F343-GQ
C8051F340-GQRC8051F346-GQ
C8051F340-GQRC8051F347-GQ

CAD (KiCad official)

Symbol: C8051F340-GQR
Footprint: Package_QFP:TQFP-48_7x7mm_P0.5mm
3D model: TQFP-48(7x7) (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: SKYWORKS SILICON LABS datasheet (288 pp, sha256 1f321894fc48c92f, 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