4 layers66.7 × 39 mm
4 layers125.5 × 100 mm
Core
KRuskowski/s5einheit s5 (S501) — 5-port managed PoE switch on Allwinner T113-S3
- Size
- 125.5 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 236
- Nets
- 225
- Pads
- 1,121
- Tracks, vias
- 2,556, 613
- Pours
- 18
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 30 Jun 2026
- Updated
- 26 Jul 2026
Overview
Core is an open-source printed circuit board by KRuskowski, from the KRuskowski/s5 repository on GitHub. It is a 4-layer board of 125.5 × 100 mm with 236 parts on 225 nets, routed with 2,556 tracks and 613 vias.
It is built around the T113-S3, DS18B20 and KSZ9477STXI, with the SHT40-AD1B-R2, TLV62569PDDCR and W25N02JWZEIF among its other parts. Its parts include 110 capacitors, 67 resistors, 17 ICs, 11 diodes and 11 connectors. It belongs with the STM32 boards of this library.
Main components
12
T113-S3
ELQFP-128ELQFP-128 Microcontrollers (MCU/MPU/SOC) ROHSAllwinner TechMicrocontrollers (MCU/MPU/SOC)
DS18B20
TO-92-55℃~+125℃ 12bit 3V~5.5V 750ms Single-bus ±0.4℃ TO-92 Temperature Sensors ROHSUMWTemperature Sensors
KSZ9477STXI
TQFP-128(14x14)-40℃~+85℃ 1.8V~3.3V 1Gbps I2C、SPI TQFP-128(14x14) Interface - Specialized ROHSMicrochip TechnologyInterface - Specialized
SHT40-AD1B-R2
DFN-4-EP(1.5x1.5)Temperature And Humidity SensorSensirion
TLV62569PDDCR
SOT-23-THIN-6-40℃~+125℃@(TJ) 1 1.5MHz 2.5V~5.5V 2A 600mV~5.5V Adjustable Buck Buck Built-in Yes SOT-23-THIN-6 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
W25N02JWZEIF
WSON-8-EP(6x8)-40℃~+85℃ 1.7V~1.95V 10 Years 100,000 cycles 166MHz 20uA 2Gbit 2ms 700us SPI WSON-8-EP(6x8) NAND FLASH ROHSWinbond ElecNAND FLASH
TPS23861PW
TSSOP-28-40℃~+85℃ 25.5W 3.3V 4 44V~57V IEEE 802.3 at(PoE+) PD detection and disconnect identification、Undervoltage Protection、Thermal Protection、Overcurrent Protection、Dual event classification detection Power Sourcing Equipment (PSE) TSSOP-28 Power Over Ethernet (PoE) Controllers ROHSTexas InstrumentsPower Over Ethernet (PoE) Controllers
TPS7B6933QDCYRQ1
SOT-223-40℃~+125℃@(Tj) 1 150mA 25uA 3.3V 40V 60dB@(100Hz) 800mV@(100mA) Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Short Circuit Protection SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AP2112K-1.8
SOT251.8V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorisedEL357N-G
SOP-4_L4.4-W4.1-P2.54-LS7.0SOP-4-2.54mm New Arrivals ROHSEverlight ElectronicsUncategorised
LPJG0926HENL
插件UncategorisedLink-PP Intl Technology
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
README
hw/core/README.mds5 Hardware — 5-Port Managed Switch Board
KiCad + SKiDL hardware for the s5 (S501) switch.
Generating the netlist
export KICAD_SYMBOL_DIR=/usr/share/kicad/symbols
export KICAD8_SYMBOL_DIR=/usr/share/kicad/symbols
python netlistscript # writes netlist_s5.netImport the result into KiCad: File -> Import -> Netlist.
What's on the board
| Block | Part | Notes |
|---|---|---|
| Management SoC | Allwinner T113-S3 (eLQFP128, SiP 128MB DDR3) | No external DRAM routing. Real pin numbers from datasheet v1.6 (see T113S3_PINMAP.md). |
| Switch ASIC | KSZ9477S (128-TQFP) | 5 copper GbE PHY ports + RGMII CPU port (port 6). Mainline DSA (microchip,ksz9477). |
| CPU-port link | T113 EMAC (RGMII, PG bank) -> KSZ port 6 | MAC-to-MAC, no magnetics, frees all 5 copper ports for users. |
| 5x GbE ports | Discrete GbE magnetics (YDS 30F-51NL) + plain RJ45 | Full 1000BASE-T (4 pairs/port). |
| PoE PSE | 2x TPS23861 (4ch each), all 5 ports | 48V DC in, N-FET + sense per port. |
| Power input | 48V DC -> TPS54560 buck (5V) | LDO chain: 3.3/2.5/1.2V (KSZ) + 0.9V buck (T113 core) + 1.8V LDO (DRAM). |
| Boot flash | W25Q128 SPI NOR (SOIC-8) | Shared SPI0 bus; flash CS on PC3, KSZ CS via GPIO. |
| Watchdog | TPS3823-33 (SOT-23-5) | RST -> T113 RESET, WDI from T113 GPIO. |
| Console | 3-pin UART header | T113 UART0 (PE2/PE3). |
| USB | USB-C (GCT USB4110) | Device mode for debug/FEL. |
| Stackup | 4-layer | No external DDR3 = no high-speed signal layer needed. |
Key design files
| File | Description |
|---|---|
netlistscript | SKiDL connection script (the source of truth) |
netlist_s5.net | Generated netlist (0 errors) |
T113S3_PINMAP.md | T113-S3 pin map extracted from datasheet v1.6 |
Open TODOs (marked in-script)
- T113 eLQFP128 exposed pad -> GND is mandatory (only one dedicated GND pin: AGND=91). Add EP in the footprint.
- RGMII CLKIN 25MHz reference source (KSZ SYNCLKO or crystal).
- Unused analog rails (VCC-LVDS/HPVCC/TVOUT/TVIN) — confirm per datasheet §5.3 whether they may be left unpowered.
- AVCC filtering (ferrite bead recommended per datasheet).
- T113 package footprint (
eLQFP128_14x14x1.4mm) — confirm or create.
Parts
236| Qty | Value | Footprint | References |
|---|---|---|---|
| 79 | 100nF | Capacitor_SMD:C_0402_1005Metric | C17, C18, C19, C20, C21, C22, C23, C24, C101, C102, C103, C104, C106, C107, C108, C109 +63 |
| 15 | 10uF | Capacitor_SMD:C_0805_2012Metric | C5, C8, C9, C10, C11, C12, C13, C14, C15, C16, C51, C90, C91, C98, C100 |
| 12 | 10k | Resistor_SMD:R_0402_1005Metric | R6, R9, R10, R11, R44, R45, R46, R47, R55, R56, R57, R65 |
| 10 | 150 | Resistor_SMD:R_0402_1005Metric | R13, R14, R15, R16, R17, R18, R19, R20, R21, R22 |
| 8 | 22 | Resistor_SMD:R_0402_1005Metric | R25, R28, R31, R34, R35, R36, R39, R40 |
| 8 | 4.7k | Resistor_SMD:R_0402_1005Metric | R7, R8, R41, R42, R59, R60, R61, R64 |
| 6 | MountingHole_M2.5_PE | connectors:MountingHole_2.7mm_M2.5_6mmPad | MH1, MH2, MH3, MH4, MH5, MH6 |
| 5 | 0.25 | Resistor_SMD:R_0805_2012Metric | R24, R27, R30, R33, R38 |
| 5 | 47 | Resistor_SMD:R_0402_1005Metric | R23, R26, R29, R32, R37 |
| 5 | LPJG0926HENL | connectors:LPJG0926HENL | J2, J3, J4, J5, J6 |
| 5 | NMOS | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | Q1, Q2, Q3, Q4, Q5 |
| 4 | 270 | Resistor_SMD:R_0402_1005Metric | R52, R53, R54, R62 |
| 3 | 100k | Resistor_SMD:R_0402_1005Metric | R1, R3, R63 |
| 3 | 10uF | Capacitor_SMD:C_1206_3216Metric | C2, C3, C4 |
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric | C63, C65 |
| 2 | 15pF | Capacitor_SMD:C_0402_1005Metric | C49, C50 |
| 2 | 18pF | Capacitor_SMD:C_0402_1005Metric | C92, C93 |
| 2 | 1N4148W | Diode_SMD:D_SOD-123 | D54, D56 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R12, R58 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C66, C67 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric | C6, C7 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R48, R49 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R50, R51 |
| 2 | BAT54 | Diode_SMD:D_SOD-323 | D52, D53 |
| 2 | DS18B20 | Package_TO_SOT_THT:TO-92_Inline | U15, U16 |
| 2 | SMBJ33CA | Diode_SMD:D_SMB | D55, D57 |
| 2 | TPS23861 | Package_SO:TSSOP-28_4.4x9.7mm_P0.65mm | U9, U13 |
| 2 | TPS7B6933QDCYRQ1 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U18, U20 |
| 1 | 0R | Resistor_SMD:R_0402_1005Metric | R67 |
| 1 | 10uF | Capacitor_SMD:C_1210_3225Metric | C1 |
| 1 | 191 | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R66 |
| 1 | 1N4148 | Diode_SMD:D_SOD-323 | D2 |
| 1 | 1uH | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | 240 | Resistor_SMD:R_0402_1005Metric | R43 |
| 1 | 24MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y2 |
| 1 | 25MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q60 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y3 |
| 1 | 4.7nF | Capacitor_SMD:C_1206_3216Metric | C110 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C105 |
| 1 | 50k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 6.04k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | AP2112K-1.2 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | AP2112K-1.8 | Package_TO_SOT_SMD:SOT-23-5 | U12 |
| 1 | AP2112K-2.5 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J7 |
| 1 | EL357N | Package_SO:SOP-4_3.8x4.1mm_P2.54mm | U21 |
| 1 | HFD23-024-1ZS | connectors:Relay_HFD23_1C_THT | K1 |
| 1 | KSZ9477S | chips:QFP40P1600X1600X120-129N | U1 |
| 1 | LG M676 green | connectors:Osram_MiniTOPLED_LSM676 | D3 |
| 1 | LO M676 orange | connectors:Osram_MiniTOPLED_LSM676 | D5 |
| 1 | LS M676 red | connectors:Osram_MiniTOPLED_LSM676 | D6 |
| 1 | LY M676 yellow | connectors:Osram_MiniTOPLED_LSM676 | D4 |
| 1 | MC1,5/5-GF-3,5_1843826 | Connector_Phoenix_MC:PhoenixContact_MC_1,5_5-GF-3.5_1x05_P3.50mm_Horizontal_ThreadedFlange | J11 |
| 1 | MPT-06-01-RA | connectors:MPT-06-01-XX-X-RA-SD | J9 |
| 1 | Mentor 1278.1004 4-way bargraph light guide | connectors:Mentor_1278.1004_LightGuide | LP1 |
| 1 | SHT40-AD1B | Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U17 |
| 1 | STM32G071CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U19 |
| 1 | SWD_2x3 | Connector_PinHeader_1.27mm:PinHeader_2x03_P1.27mm_Vertical | J10 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KMR2 | SW2 |
| 1 | T113-S3 | chips:eLQFP-128-1EP_14x14mm_P0.4mm | U7 |
| 1 | TLV62569PDDCR | Package_TO_SOT_SMD:SOT-23-6 | U11 |
| 1 | TPS3823 | Package_TO_SOT_SMD:SOT-23-5 | U10 |
| 1 | Thermostat_NO_95C | Connector_Wire:SolderWire-0.25sqmm_1x02_P4.2mm_D0.65mm_OD1.7mm | TS1 |
| 1 | USB-C_2171820001 | connectors:CONN_2171820001_MOL | J12 |
| 1 | W25N02JWZEIF | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | microSD | Connector_Card:microSD_HC_Molex_104031-0811 | J8 |
Questions
How big is the Core PCB?
It measures 125.5 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Core use?
236 parts, built around the T113-S3, DS18B20, KSZ9477STXI and SHT40-AD1B-R2. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Core KiCad files?
From the KRuskowski/s5 repository on GitHub, at the commit this page was made from: the board is hw/core/s5.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Core design in my own project?
Its repository states no licence, so its author keeps all rights: ask KRuskowski before reusing the design.
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