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Espion cam
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Kvm switch
Rithvik-Vadlamani/kvm-switchFour-layer HDMI/USB KVM design with STM32 firmware, supply supervision, and verification evidence
- Size
- 100 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 170
- Nets
- 239
- Pads
- 1,051
- Tracks, vias
- 4,399, 387
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Sep 2026
- Updated
- 14 Oct 2026
Overview
Kvm switch is an open-source printed circuit board by Rithvik-Vadlamani, from the Rithvik-Vadlamani/kvm-switch repository on GitHub. It is a 4-layer board of 100 × 100 mm with 170 parts on 239 nets, routed with 4,399 tracks and 387 vias.
It is built around the STM32F030C8T6, HD3SS215IRTQT and USB2514B-AEZC-TR, with the TPD4E02B04DQAR, TPD4E05U06DQAR and TPS2051CDBVR among its other parts. Its parts include 54 capacitors, 48 resistors, 36 ICs, 5 diodes and 4 connectors. It belongs with the interfaces and adapters boards and the STM32 boards of this library.
Main components
12
STM32F030C8T6
LQFP-48(7x7)-40℃~+85℃ 12bit 2.4V~3.6V 32 Bit 39 48MHz 64KB 8KB ARM Cortex-M0 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
HD3SS215IRTQT
HVQFN-56-EP(8x8)-40℃~+85℃ 3.2mA 3V~3.6V 6Gbps 8uA HVQFN-56-EP(8x8) Interface - Specialized ROHSTexas InstrumentsInterface - Specialized
USB2514B-AEZC-TR
VQFN-36-EP(6x6)0℃~+85℃ 3.3V 4 480Mbps Hub I2C、SMBus USB 2.0 VQFN-36-EP(6x6) USB HUB Controllers ROHSMicrochip TechnologyUSB Converters
TPD4E02B04DQAR
USON-10(1x2.5)-40℃~+125℃ 0.33pF 10nA 17W@8/20us 2A@8/20us 3.6V 7.5V 8.8V Bidirectional Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 TVS USON-10(1x2.5) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)TPD4E05U06DQAR
USON-10-40℃~+125℃ 0.5pF 10nA 14V 2.5A@8/20us 40W@8/20us 5.5V 6.5V ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Unidirectional USON-10(1x2.5) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD Protection Devices
TPS2051CDBVR
SOT-23-5-40℃~+125℃ 100nA 2.5V~5.5V 3.8A Not supported Not supported Soft-start、Under-voltage lockout、Overcurrent Protection、Short-Circuit Protection、Reverse current blocking、Overvoltage protection、Output discharge function SOT-23-5 Power Distribution Switches ROHSTECH PUBLICPower Distribution Switches
TPS2553DBVR-1
SOT-23-6-40℃~+150℃ 1 1.5A 2.5V~6.5V 85mΩ Active High High Side Switch 过压保护、软启动、欠压锁定、反向电压保护、集成电荷泵、Overcurrent Protection、Over temperature protection、锁存保护、Short-Circuit Protection、反向电流阻断 SOT-23-6 Power Distribution Switches ROHSTexas InstrumentsPower Distribution SwitchesAP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSN74LVC1G97DBVRE4
SOT-23-6-40℃~+125℃ 1 1.65V~5.5V 10uA 2.4V、3.8V 24mA 24mA 400mV、550mV 6.3ns@3.3V 74LVC Configurable Multi-Function Gate SOT-23-6 Logic Gates ROHSTexas InstrumentsLogic GatesTPS3808G33DBVR-TP
SOT-23-6L-40℃~+125℃ 1 1.7V~6.5V 2.8uA 3.07V Active Low Manual reset input Open Drain Voltage monitor SOT-23-6L Supervisor and Reset ICs ROHSTECH PUBLICUncategorised
TS3USB221RSER-TP
QFN-10L(1.5x2)-40℃~+85℃ 13uA 2.5V~5.5V 2/4 200ps@3.3V,0pF Power-off protection、Break-before-make function、Overcurrent Protection Single Supply QFN-10L(1.5x2) Signal Switches, Multiplexers, Decoders ROHSTECH PUBLICSignal Switches, Multiplexers, Decoders
CC0402KRX7R9BB104
0402100nF 50V X7R ±10% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
README
README.mdHDMI/USB KVM switch
A four-layer board and STM32F030 firmware for sharing two HDMI displays and a four-port USB 2.0 hub between two computers. I designed the switching hardware and firmware, including supply supervision, hub reset control, and a timed disconnect sequence.
Start here
- Firmware and host-side tests
- Editable KiCad project
- Prototype test plan
- A2 verification results
- Manufacturing notes
Current published design: A2, September 2026. It uses external regulated 12 V power. The USB-C host connectors carry USB 2.0 data; they do not provide USB-C video or USB Power Delivery.
The firmware switches with a 150 ms disconnect interval followed by 100 ms of settling, handles host detection, debounces the selection button, and uses watchdog recovery. The verification package contains state exploration and mutation results, plus PCB checks.
Build and test
The firmware needs GNU Make and the GNU Arm toolchain. Run make -C firmware to build the STM32 image. The firmware README describes the host-side checks.
This is a prototype design. Firmware/model tests and static PCB checks do not establish USB enumeration, HDMI interoperability, signal integrity, or physical operating limits. The board has not been qualified on assembled hardware.
Parts
170| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 100nF | Capacitor_SMD:C_0402_1005Metric | C3, C21, C22, C25, C27, C28, C29, C31, C34, C35, C36, C37, C38, C39, C40, C41 +10 |
| 18 | 100k | Resistor_SMD:R_0402_1005Metric | R17, R18, R19, R20, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34 +2 |
| 12 | TPD4E02B04DQA | KVM_Custom_Footprints:USON-10_2.5x1.0mm_P0.5mm_Assembly | U4, U5, U7, U11, U12, U13, U14, U15, U16, U17, U18, U19 |
| 11 | 10k | Resistor_SMD:R_0402_1005Metric | R2, R3, R4, R13, R39, R40, R41, R42, R43, R45, R49 |
| 8 | TPD4E05U06DQAR | KVM_Custom_Footprints:USON-10_2.5x1.0mm_P0.5mm_Assembly | U24, U25, U26, U27, U28, U29, U30, U31 |
| 6 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C10, C11, C12, C13, C14, C15 |
| 6 | Fiducial_1mm_Mask2mm | Fiducial_1mm_Mask2mm | FID1, FID2, FID3, FID4, FID5, FID6 |
| 5 | 1uF | Capacitor_SMD:C_0603_1608Metric | C24, C26, C32, C49, C50 |
| 4 | 220uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C43, C44, C45, C46 |
| 4 | 22uF | Capacitor_SMD:C_1206_3216Metric | C1, C4, C51, C52 |
| 4 | 47k | Resistor_SMD:R_0402_1005Metric | R6, R14, R15, R16 |
| 4 | 5.1k | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10 |
| 4 | TPS2051CDBVR | Package_TO_SOT_SMD:SOT-23-5 | U20, U21, U22, U23 |
| 4 | USBLC6-2SC6 | usblc6:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | D1, D2, D3, D4 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C2, C5, C23 |
| 3 | M3 mounting | MountingHole_3.2mm_M3 | H1, H2, H3 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric | C16, C30 |
| 2 | 150k | Resistor_SMD:R_0402_1005Metric | R35, R37 |
| 2 | 18pF | Capacitor_SMD:C_0402_1005Metric | C19, C20 |
| 2 | 210k | Resistor_SMD:R_0402_1005Metric | R47, R48 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R11, R22 |
| 2 | HD3SS215IRTQR | Package_DFN_QFN:QFN-56-1EP_8x8mm_P0.5mm_EP4.5x5.2mm_ThermalVias | U6, U8 |
| 2 | TPS2553DBVR | Package_TO_SOT_SMD:SOT-23-6 | U32, U33 |
| 2 | USB4105-GF-A-120 | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1, J2 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C18 |
| 1 | 10k | KVM_Custom_Footprints:Assembly_R44 | R44 |
| 1 | 10k | KVM_Custom_Footprints:Assembly_R46 | R46 |
| 1 | 12.4k | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 12V DC center-positive | Connector_BarrelJack:BarrelJack_Wuerth_694106106102_2.0x5.5mm | J3 |
| 1 | 150pF | Capacitor_SMD:C_0402_1005Metric | C33 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R50 |
| 1 | 24MHz 12pF | KVM_Custom_Footprints:Assembly_Y1 | Y1 |
| 1 | 53.6k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 6.8uH | KVM_Custom_Footprints:Bourns_SRP7050TA | L1 |
| 1 | 600R@100MHz | Inductor_SMD:L_0805_2012Metric | L2 |
| 1 | AP2112K-3.3TRG1 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | AP63301WU-7 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_C2_MON1 | J_HDMI_C2_MON1 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_MON2 | J_HDMI_MON2 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_MON1 | J_HDMI_MON1 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_C1_MON2 | J_HDMI_C1_MON2 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_C2_MON2 | J_HDMI_C2_MON2 |
| 1 | HDMI_A_1.4 | KVM_Custom_Footprints:Assembly_J_HDMI_C1_MON1 | J_HDMI_C1_MON1 |
| 1 | SN74LVC1G97DBVR | Package_TO_SOT_SMD:SOT-23-6 | U36 |
| 1 | SS34 | Diode_SMD:D_SMA | D20 |
| 1 | STM32F030C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U3 |
| 1 | SWD | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J4 |
| 1 | SW_Push | Button_Switch_THT:SW_SPST_Omron_B3F-40xx | SW1 |
| 1 | TPS3808G33DBVR | Package_TO_SOT_SMD:SOT-23-6 | U34 |
| 1 | TPS3808G50DBVR | Package_TO_SOT_SMD:SOT-23-6 | U35 |
| 1 | TS3USB221RSER | Package_DFN_QFN:Texas_UQFN-10_1.5x2mm_P0.5mm | U9 |
| 1 | USB1046-GF-0190-L-B-A | KVM_Custom_Footprints:Assembly_J_USB4 | J_USB4 |
| 1 | USB1046-GF-0190-L-B-A | KVM_Custom_Footprints:Assembly_J_USB2 | J_USB2 |
| 1 | USB1046-GF-0190-L-B-A | KVM_Custom_Footprints:Assembly_J_USB3 | J_USB3 |
| 1 | USB1046-GF-0190-L-B-A | KVM_Custom_Footprints:Assembly_J_USB1 | J_USB1 |
| 1 | USB2514B-AEZC-TR | Package_DFN_QFN:QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm_ThermalVias | U10 |
Questions
How big is the Kvm switch PCB?
It measures 100 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Kvm switch use?
170 parts, built around the STM32F030C8T6, HD3SS215IRTQT, USB2514B-AEZC-TR and TPD4E02B04DQAR. 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 Kvm switch KiCad files?
From the Rithvik-Vadlamani/kvm-switch repository on GitHub, at the commit this page was made from: the board is KVM_Switch.kicad_pcb and its schematic KVM_Switch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Kvm switch design in my own project?
Its repository states no licence, so its author keeps all rights: ask Rithvik-Vadlamani before reusing the design.
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