Part Information Review and Updates

Thought for 3 mins 18 sec

I reviewed the current part project for CP2102N-A02-GQFN20 against the official Silicon Labs datasheet and the existing symbol/footprint data. For part-project audits like this, the datasheet should be treated as the source of truth, the pin count must match exactly, and the exposed pad counts as a pin.

Datasheet URL

I found no existing Datasheet URL project property in the current part metadata.

Use this official URL:

https://www.silabs.com/documents/public/data-sheets/cp2102n-datasheet.pdf

Current project metadata vs datasheet Summary

Table

Item	Current project	Datasheet / official source	Status
MPN	`CP2102N-A02-GQFN20`	`CP2102N-A02-GQFN20`	Match
Manufacturer Name	Not found	Silicon Labs	Missing
Designator Prefix	`U`	`U` is appropriate for an IC-style part	OK
Datasheet URL	Not found	Official PDF found	Missing
Description	Not found	USB-to-UART bridge controller	Missing
Package property	Not found as property	20-pin QFN, 3.00 mm x 3.00 mm, 0.50 mm pitch, exposed pad GND	Missing

Key specs from the official datasheet

Table

Spec	Value
Function	USB-to-UART bridge controller
USB	USB 2.0 compliant, full-speed (12 Mbps)
UART baud rate	300 baud to 3 Mbaud
VDD	3.0 V to 3.6 V
VIO	1.71 V to VDD
VREGIN	3.0 V to 5.25 V
Temperature range	-40 C to +85 C
Package	20-pin QFN, 3.00 mm x 3.00 mm, exposed pad to GND

Symbol audit What matches

The symbol names broadly line up with the CP2102N-A02-GQFN20 variant:
- GPIO1/RS485
- GPIO0/CLK
- D+, D-
- VDD, VREGIN, VBUS
- RSTb
- SUSPEND, SUSPENDb
- WAKEUP
- CTS, RTS, RXD, TXD
- GPIO3/RXT
- GPIO2/TXT
- GND and exposed-pad GND

Mismatches / issues

Table

Issue	Finding	Expected
Missing pin	Pin 10 is missing from the symbol	Pin 10 = NC
Pin count	Symbol has pins 1-9, 11-20, EXP	Datasheet requires 1-20 plus exposed pad
Pin type typing	All terminals are currently `Bi-Directional`	Should be mixed: `Ground`, `Power In`, `Input`, `Output`, `Bi-Directional`, `Not Connected`
Pin descriptions	No `Pin Description` properties found	Each pin should have a short functional description

Pin-type corrections that are clearly needed

Table

Pin	Datasheet function	Better Flux pin type
3, 20, EXP	GND	`Ground`
7	VREGIN	`Power In`
8	VBUS sense	`Input`
9	RSTb	`Input`
10	NC	`Not Connected`
11	SUSPENDb	`Output`
12	SUSPEND	`Output`
13	WAKEUP	`Input`
14	CTS	`Input`
15	RTS	`Output`
16	RXD	`Input`
17	TXD	`Output`
1, 2, 18, 19	GPIO / multifunction	`Bi-Directional`
4, 5	USB D+, D-	`Bi-Directional` is reasonable
6	VDD	borderline functional supply node; should not stay generic `Bi-Directional`

Footprint audit What matches

The footprint asset is WFQFN-20.kicad_mod.
The pad geometry is consistent with a 3 mm x 3 mm, 0.5 mm pitch QFN20 with center pad.
The exposed pad exists and is mapped to GND.
The overall footprint style looks compatible with the datasheet package.

Footprint mismatch

Table

Issue	Finding	Expected
Missing pad mapping	The footprint asset includes pad 10, but the project terminal list does not	Symbol and footprint should both include pin 10 = NC

So the main footprint problem is not the pad shape itself - it is the symbol-to-footprint pin mapping completeness.

Pin-description audit

No Pin Description properties were found on the current terminals. That is incomplete for a reusable part project; short per-pin descriptions are recommended for auditability and symbol clarity.

Examples that should exist:

Pin 8: VBUS sense input
Pin 10: No connect
Pin 17: UART transmit output
Pin EXP: Exposed ground pad

Bottom line Good

MPN is correct.
Footprint family appears correct.
Exposed pad is present.
Most pin names align with the datasheet.

Problems to fix

Add missing project property: Datasheet URL
Add missing project property: Manufacturer Name = Silicon Labs
Add missing project description
Add missing package property
Add pin 10 = NC
Reclassify nearly all pin types from generic Bi-Directional
Add short pin descriptions for all pins

If you want, I can next give you a ready-to-apply correction list for all 21 terminals/properties in Flux-friendly form.

Give correction list

Fix pin metadata

Check missing pin 10

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