Part Information Review and Updates
3:18
Reviewing Datasheet Properties.
Consulting on Datasheet Updates.
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Analyzing the schematic.
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Found 10 results.
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Addressing missing pin details.
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Looking for "Part number, manufacturer, package variants, short description, USB version, UART function, supply/operating voltage, and operating temperature range for the CP2102N family." in cp2102n-datasheet.pdf
Looking for "Complete pin table for the CP2102N 20-pin GQFN or WFQFN package including pin 10 and the exposed pad, with pin names and functions." in cp2102n-datasheet.pdf
Looking for "Package and recommended land pattern details for the CP2102N 20-pin GQFN/WFQFN package, including body size, exposed pad, and any footprint notes." in cp2102n-datasheet.pdf
Looking for "Functions of pins GPIO0/CLK GPIO1/RS485 GPIO2/TXT GPIO3/RXT RSTb SUSPEND SUSPENDb WAKEUP VBUS VREGIN VDD D+ D- CTS RTS RXD TXD and GND for CP2102N." in cp2102n-datasheet.pdf
Datasheet URL project property in the current part metadata.Summary
| 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
| 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 |
- 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
| 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
| 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 |
- 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
| 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 |
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.- Pin 8:
VBUS sense input - Pin 10:
No connect - Pin 17:
UART transmit output - Pin EXP:
Exposed ground pad
- MPN is correct.
- Footprint family appears correct.
- Exposed pad is present.
- Most pin names align with the datasheet.
- 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
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