Part Information Review and Updates

flux

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:
Current project metadata vs datasheet Summary

Table

ItemCurrent projectDatasheet / official sourceStatus
MPNCP2102N-A02-GQFN20CP2102N-A02-GQFN20Match
Manufacturer NameNot foundSilicon LabsMissing
Designator PrefixUU is appropriate for an IC-style partOK
Datasheet URLNot foundOfficial PDF foundMissing
DescriptionNot foundUSB-to-UART bridge controllerMissing
Package propertyNot found as property20-pin QFN, 3.00 mm x 3.00 mm, 0.50 mm pitch, exposed pad GNDMissing
Key specs from the official datasheet

Table

SpecValue
FunctionUSB-to-UART bridge controller
USBUSB 2.0 compliant, full-speed (12 Mbps)
UART baud rate300 baud to 3 Mbaud
VDD3.0 V to 3.6 V
VIO1.71 V to VDD
VREGIN3.0 V to 5.25 V
Temperature range-40 C to +85 C
Package20-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

IssueFindingExpected
Missing pinPin 10 is missing from the symbolPin 10 = NC
Pin countSymbol has pins 1-9, 11-20, EXPDatasheet requires 1-20 plus exposed pad
Pin type typingAll terminals are currently Bi-DirectionalShould be mixed: Ground, Power In, Input, Output, Bi-Directional, Not Connected
Pin descriptionsNo Pin Description properties foundEach pin should have a short functional description
Pin-type corrections that are clearly needed

Table

PinDatasheet functionBetter Flux pin type
3, 20, EXPGNDGround
7VREGINPower In
8VBUS senseInput
9RSTbInput
10NCNot Connected
11SUSPENDbOutput
12SUSPENDOutput
13WAKEUPInput
14CTSInput
15RTSOutput
16RXDInput
17TXDOutput
1, 2, 18, 19GPIO / multifunctionBi-Directional
4, 5USB D+, D-Bi-Directional is reasonable
6VDDborderline 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

IssueFindingExpected
Missing pad mappingThe footprint asset includes pad 10, but the project terminal list does notSymbol 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
Sign up to send

Files

Pins

Symbol

Layout

Preview

Name
Pin #
Type
Part Type
Terminal Order
GPIO1/RS485
1
Bi-Directional
Terminal
GPIO0/CLK
2
Bi-Directional
Terminal
GND
3
Bi-Directional
Terminal
D+
4
Bi-Directional
Terminal
D-
5
Bi-Directional
Terminal
VDD
6
Bi-Directional
Terminal
VREGIN
7
Bi-Directional
Terminal
VBUS
8
Bi-Directional
Terminal
RSTB
9
Bi-Directional
Terminal
SUSPENDB
11
Bi-Directional
Terminal
GND
12
Bi-Directional
Terminal
WAKEUP
13
Bi-Directional
Terminal
SUSPEND
14
Bi-Directional
Terminal
CTS
15
Bi-Directional
Terminal
RTS
16
Bi-Directional
Terminal
RXD
17
Bi-Directional
Terminal
TXD
18
Bi-Directional
Terminal
GPIO3/RXT
19
Bi-Directional
Terminal
GPIO2/TXT
20
Bi-Directional
Terminal
GND
EXP
Bi-Directional
Terminal

CP2102N-A02-GQFN20