Part Data Review and Cleanup


I reviewed the part against the official datasheet using the datasheet as the source of truth and checked for exact pin-count alignment, which is the right validation method for a part project .
Part info found Current project metadata
Only these project properties are currently set:
  • Manufacturer Part Number = LPC4357FET256
  • Designator Prefix = U
These are missing/unset:
  • Datasheet URL
  • Manufacturer Name
  • Part Type
  • Package or Case Code
  • meaningful project description
Datasheet-derived identity and package
  • Manufacturer: NXP Semiconductors N.V.
  • Part type: 32-bit ARM Cortex-M4/M0 microcontroller
  • Package: LBGA256
  • Package details: 256 balls, 17 x 17 x 1 mm
  • Package code: SOT740-2
Key specs
  • Dual-core ARM Cortex-M4 with FPU + ARM Cortex-M0 coprocessor
  • Up to 204 MHz
  • 1 MB flash total
  • 136 kB SRAM
  • 16 kB EEPROM
  • Two high-speed USB 2.0 controllers
  • 10/100 Ethernet MAC
  • LCD controller
  • Supply: 2.4 V to 3.6 V nominal 3.3 V
  • Temp range: -40 C to +105 C
Cross-check results Footprint vs package
  • The project footprint asset is BGA-256_L17.0-W17.0-R16-C16-P1.0-BL.kicad_mod
  • That is consistent with the datasheet package: LBGA256, 17 x 17 mm
  • Layout summary shows 256 pads
  • Schematic summary shows 256 terminal components
Result: No obvious footprint/package or pin-count mismatch.
Symbol terminal spot-check
I spot-checked representative terminals and their ball locations against the datasheet:
Result: The sampled symbol pin names and ball assignments are consistent with the official datasheet.
Mismatches and gaps flagged Metadata issues
  • Missing Datasheet URL
  • Missing Manufacturer Name
  • Missing Part Type
  • Missing Package or Case Code
  • Description is effectively unfilled/useless
Symbol quality issues
I did not find:
  • Pin Description properties
  • any Pin Type values other than Unspecified
  • explicit Section
  • explicit Pin Group
  • explicit sub-symbol metadata
For a complex MCU part, those fields should be populated so the symbol is easier to use and ERC is more meaningful .
Practical interpretation
So the project looks structurally correct at a basic level:
  • right package family
  • right ball count
  • no obvious missing pads
  • sampled pin-name-to-ball mapping matches
But it is incomplete as a high-quality reusable part, because the metadata and pin semantics are largely missing.
Recommended fixes
If you want this part cleaned up, I would set:
  • Datasheet URL = https://www.nxp.com/docs/en/data-sheet/LPC435X_3X_2X_1X.pdf
  • Manufacturer Name = NXP Semiconductors N.V.
  • Part Type = Microcontroller
  • Package or Case Code = LBGA256
  • Description like:
    • Dual-core Cortex-M4/M0 microcontroller, 204 MHz, 1 MB flash, 136 kB SRAM, LBGA256
And for the symbol:
  • power pins -> Power In
  • ground pins -> Ground
  • GPIO ports -> Bi-Directional
  • debug pins -> appropriate debug/control typing
  • clock pins -> Passive
  • add short Pin Description text
  • add Section, Pin Group, and sub-symbol grouping for readability, which is especially appropriate on large ICs
If you want, I can take the editable clone and do the full metadata + symbol cleanup for you.
Clean up this part
Set missing metadata
Group symbol sections

P8_3
PD_8
PF_1
PE_1
P6_6
VSSIO
PC_13
PE_11
WAKEUP1
PC_9
VDDIO
VDDIO
P4_3
CLK1
P6_4
P4_8
PF_4
I2C0_SDA
PD_1
P1_0
PC_11
VSSIO
P5_6
P1_13
PE_0
PE_3
VSSIO
VDDIO
USB1_DP
P4_10
VDDA
PC_6
P2_2
PC_1
PC_3
P6_3
P8_5
PD_3
P7_5
P2_7
P5_1
VSSIO
P5_2
P9_1
P8_0
PD_14
PB_4
P1_18
VSS
PC_2
PC_0
PA_0
P2_12
TRST#
USB0_VSSA_REF
USB0_ID
VDDIO
P8_1
P3_7
P4_6
P1_3
P8_7
USB0_VBUS
PF_5
VDDIO
VDDREG
VDDIO
P4_4
PF_0
PE_7
RESET#
P1_6
P1_7
P6_1
VSSIO
P6_0
PE_14
PC_7
I2C0_SCL
P3_4
WAKEUP3
USB0_RREF
P2_10
VSSIO
CLK3
P7_6
PE_6
PD_9
XTAL1
P7_0
P1_10
PD_2
P3_6
ADC0_7/ADC1_7
PF_9
P9_6
P2_11
PD_12
PA_4
USB0_DP
PE_8
P2_13
P6_5
VDDREG
CLK2
P1_12
P3_1
PC_12
TCK/SWDCLK
P1_11
VSSIO
VPP
PE_10
PE_2
P1_17
PE_9
P8_4
VSS
P5_5
P7_2
P5_7
PC_10
PB_3
ADC0_4/ADC1_4
P4_9
RTC_ALARM
P1_9
P5_4
PB_2
PE_12
VSSIO
RTCX2
PC_14
P6_8
PD_7
PD_15
TDI
VSSIO
ADC0_5/ADC1_5
SAMPLE#
P1_19
TDO/SWO
P8_2
PE_5
P5_0
P1_16
P1_1
P9_5
PC_5
PD_11
P6_11
P3_2
USB0_VSSA_TERM
P3_8
P2_4
VSSIO
P4_5
P6_9
WAKEUP2
VDDIO
PA_1
PF_6
VSSA
PF_11
ADC0_1/ADC1_1
PD_10
TMS/SWDIO
P8_6
P4_0
P4_2
P0_0
DBGEN
P2_1
P6_7
VBAT
PB_6
USB0_VDDA3V3_DRIVER
PF_10
RTCX1
ADC0_0/ADC1_0/DAC
PD_0
PD_16
P3_0
P2_5
ADC0_2/ADC1_2
PB_5
P5_3
P8_8
P3_5
P9_4
ADC0_6/ADC1_6
CLK0
PB_1
PF_7
VDDIO
P2_8
P9_0
P6_2
VDDIO
VDDIO
P1_15
PE_4
PD_4
XTAL2
P7_3
USB0_VDDA3V3
VDDIO
P1_14
P1_4
PF_2
P7_4
P1_2
PD_13
P3_3
P7_1
P2_3
VSS
ADC0_3/ADC1_3
P6_12
P2_9
P2_6
WAKEUP0
P9_3
P0_1
P9_2
VDDREG
PD_6
VSSIO
USB0_DM
P1_20
PE_15
PA_3
P1_5
P4_7
PF_3
P4_1
VSS
VDDREG
P2_0
P1_8
PE_13
PC_4
VDDIO
VDDIO
VSSIO
P7_7
USB1_DM
PF_8
P6_10
PC_8
VSSIO
PB_0
VSSIO
PD_5
VSS
PA_2

LPC4357FET256