4 layers160 × 90 mm
6 layers100 × 220 mm
Srvant mk2
lwolf/srvant-board2[WIP] Carrier board for the CM4 with BMC
- Size
- 100 × 220 mm
- Copper layers
- 6
- Thickness
- 1.61 mm
- Parts
- 276
- Nets
- 390
- Pads
- 1,251
- Tracks, vias
- 2,676, 575
- Pours
- 21
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 12 Jul 2021
- Updated
- 9 Nov 2025
Overview
Srvant mk2 is an open-source printed circuit board by lwolf, from the lwolf/srvant-board repository on GitHub. It is a 6-layer board of 100 × 220 mm with 276 parts on 390 nets, routed with 2,676 tracks and 575 vias.
It is built around the 74LVC1G07SE-7-MS, KSZ9131RNXI-TR and AP63205WU, with the 74AHC1G08GW, PCF85063AT/AAZ and 74AHC1G04SE among its other parts. Its parts include 113 capacitors, 68 resistors, 22 ICs, 11 diodes and 8 connectors. It belongs with the computers and single-board computers boards and the NXP (LPC, Kinetis, i.MX RT) and Raspberry Pi (Linux) boards of this library.
Main components
12
74LVC1G07SE-7-MS
SC-70-5SC-70-5 Buffers, Drivers, Receivers, Transceivers ROHSMSKSEMIBuffers, Drivers, Receivers, TransceiversKSZ9131RNXI-TR
QFN-48(7x7)QFN-48(7x7) Ethernet Transceivers ROHSMicrochip TechnologyBuffers, Drivers, Receivers, Transceivers
AP63205WU
TSOT-23-6-40℃~+85℃@(TA) 1 1.1MHz 22uA 2A 3.8V~32V 5V Buck Built-in Fixed Overcurrent Protection、Light load efficient mode、Cycle-by-cycle current limiting、Hiccup current limiting、EMI optimization (spread spectrum) Step-down type Yes TSOT-23-6 DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters74AHC1G08GW
SOT-353-40℃~+125℃ 1 1.5V~3.85V 1.9V~2V、2.9V~3V、3.7V~3.94V、4.4V~4.5V 100mV、360mV~550mV 10nA 2 2V~5.5V 500mV~1.65V 74AHC Series 9.5ns@3.3V,15pF AND Gate Overvoltage-tolerant input StandardCMOS SOT-353 Logic Gates ROHSMDDLogic Gates
PCF85063AT/AAZ
SO-8-40℃~+85℃ 220nA 900mV~5.5V Built-in I2C Programmable clock output、Alarm function、Periodic interrupt output、Countdown timer Yes SO-8 Real Time Clocks ROHSNXP SemiconductorsReal Time Clocks74AHC1G04SE
SOT-353-40℃~+125℃ 1 1 1.5V~3.85V 1.9V、2.9V、4.4V 1uA 2V~5.5V 500mV~1.65V 7.5ns@5V,50pF 74AHC 8mA 8mA Noise suppression function Schmitt trigger SOT-353 Inverters ROHSDiodes IncorporatedInverters74AHC1G32GW
SOT-353-40℃~+125℃ 1 1.5V~3.85V 1.9V、2.9V、3.94V、4.4V 100mV、100mV、100mV、550mV 1uA 2 2V~5.5V 500mV~1.65V 7.5ns@5V,50pF 74AHC Series 8mA 8mA OR Gate Overvoltage-tolerant input SOT-353 Logic Gates ROHSNexperiaLogic GatesAP22653W6
SOT-26-40℃~+85℃ 1 2.1A 3V~5.5V 65mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Over Voltage Protection、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Overtemperature protection (OTP) SOT-26 Power Distribution Switches ROHSDiodes IncorporatedPower Distribution Switches
FSUSB42MUX
MSOP-10-40℃~+85℃ 12ns 13ns 2 250ps 2:1 3.7pF 3.9Ω 3V~4.4V 720MHz MSOP-10 Analog Switches, Multiplexers ROHSonsemiAnalog Switches, Multiplexers
SLB9670VQ20FW785XTMA1
QFN-32-EP(5x5)-20℃~+85℃ 110uA 3.3V SPI QFN-32-EP(5x5) Security Verification / Encryption ICs ROHSInfineon TechnologiesSecurity Verification / Encryption ICs
DMP3013SFV-7(ES)
PDFN-8L(3x3)PDFN-8L(3x3) MOSFETs ROHSElecSuperMOSFETs
PESD2USB5UX-TR
TO-236AB0.47pF 11V 1nA 3.3V 4A@8/20us 5V TVS Unidirectional TO-236AB ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
README
README.mdsrvant-board
| :warning: WARNING |
|---|
| This is a work-in-progress. No final board have been produced yet. Any part of the schematic and/or PCB could be wrong. |
Design of the carrier board for the Raspberry Pi CM4. The main distinction from existing boards is the presence of the BMC (Baseboard Management Controller) which supposed to monitor and control the HOST, allowing the board to act as a real "server".
Highlevel design / idea:
BMC using lots of GPIO controls the HOST: power cycle, terminal access, switches USB into OTG for flushing.
- CM4 (HOST) features:
- 1Gb/s ethernet
- HDMI
- 1 USB
- PCIe exposed as M.2 socket to connect nvme drive
- TPM2.0 (OPTIGA™ TPM SLB 9670)
- RTC with battery
- BMC features:
- Always ON
- 1Gb/s management port
- USB port for debug
- USB connection to the HOST for flushing
- I2C connection to the HOST for additional metrics
- TTY connection to HOST for SOL (Serial over LAN)
- measures Current/Power of the board
- measures Temperature of the board
- controls FAN (not available in the PoC)
BMC is based on the Allwinner T113 S3 SoM link to aliexpress.
Power
THere are separate 5v rails for host and BMC. The host one is based on AP64501SP (5V 5A), while BMC is based on AP63205WU (5V 2A). BMC is always on. Host is being powered either by a signal from BMC or by shortening a jumper.
Main power goes through the shunt resistor connected to the power sensor (INA219A). The value is available to BMC using i2c bus.
Connectors
HOST
Host has a following connectors:
- Ethernet
- HDMI
- USB
- M.2 socket M for nvme disk
BMC
BMC has a following connectors:
- Ethernet (1GB/s)
- MicroUSB (debug)
USB
There is a connection between BMC and HOST using USB to allow flushing the HOST remotely. Since CM4 has only a single usb line, it is connected to the MUX (FSUSB42MUX) in a similar way it is done in the CM4IO board, but instead of switching client mode to microUSB, it goes to BMC.
RTC
RTC is based on PCF85063AT chip. There are two of them, one for each CPU. Even though t133-s3 has on-board RTC, it is not exposed from the SOM and reference schematic uses external one. Both chips are powered by 3.3v coming from BMC and coin cell battery.
Parts
276| Qty | Value | Footprint | References |
|---|---|---|---|
| 52 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C14, C15, C29, C31, C32, C34, C35, C102, C104, C105, C111, C112, C122, C123, C126 +36 |
| 34 | 10u | Capacitor_SMD:C_0805_2012Metric | C10, C11, C12, C13, C18, C19, C106, C107, C108, C109, C110, C116, C117, C118, C119, C121 +18 |
| 22 | 10K | Resistor_SMD:R_0402_1005Metric | R10, R11, R12, R24, R25, R30, R34, R42, R44, R46, R51, R54, R56, R61, R68, R71 +6 |
| 13 | 22R | Resistor_SMD:R_0402_1005Metric | R18, R19, R20, R21, R22, R23, R36, R37, R38, R39, R40, R41, R62 |
| 12 | 10u | Capacitor_SMD:C_0402_1005Metric | C30, C33, C49, C52, C53, C54, C55, C56, C83, C85, C92, C124 |
| 10 | 1K | Resistor_SMD:R_0402_1005Metric | R13, R14, R28, R33, R47, R48, R50, R60, R65, R70 |
| 7 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7 |
| 5 | 1u | Capacitor_SMD:C_0402_1005Metric | C42, C86, C93, C94, C125 |
| 5 | 220R | Resistor_SMD:R_0402_1005Metric | FB1, FB2, FB4, FB5, FB8 |
| 5 | TPD4EUSB30 | Package_SON:USON-10_2.5x1.0mm_P0.5mm | U7, U10, U11, U19, U20 |
| 4 | 100u | Capacitor_Tantalum_SMD:CP_EIA-7343-31_Kemet-D | C24, C28, C74, C120 |
| 4 | MountingHole | MountingHole:MountingHole_2.5mm_Pad_TopOnly | H4, H5, H6, H7 |
| 4 | PCIe_nRST | TestPoint:TestPoint_Pad_D1.0mm | TP15, TP20, TP21, TP22 |
| 3 | 10R | Resistor_SMD:R_0402_1005Metric | R7, R8, R16 |
| 3 | 1n | Capacitor_SMD:C_0402_1005Metric | C84, C91, C99 |
| 3 | 330R | Resistor_SMD:R_0402_1005Metric | R15, R17, R74 |
| 3 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3, J13, J14 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D3, D4, D10 |
| 2 | +5v HOST | TestPoint:TestPoint_Pad_2.0x2.0mm | TP2, TP23 |
| 2 | 1200p | Capacitor_SMD:C_0402_1005Metric | C17, C114 |
| 2 | 12K | Resistor_SMD:R_0402_1005Metric | R1, R63 |
| 2 | 15K | Resistor_SMD:R_0402_1005Metric | R53, R69 |
| 2 | 1N4148 | Diode_SMD:D_SOD-523 | D5, D6 |
| 2 | 3.3K | Resistor_SMD:R_0402_1005Metric | R75, R76 |
| 2 | 3.3µH | Inductor_SMD:L_Bourns_SRN6045TA | L2, L4 |
| 2 | 470R | Resistor_SMD:R_0402_1005Metric | R66, R67 |
| 2 | 510K | Resistor_SMD:R_0402_1005Metric | R57, R59 |
| 2 | 74AHC1G08 | Package_TO_SOT_SMD:SOT-23-5 | U24, U25 |
| 2 | 74LVC1G07SE-7 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U18, U21 |
| 2 | AP64501SP-13 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.71x3.4mm_ThermalVias | U2, U26 |
| 2 | ARJM11 | Connector_RJ:RJ45_Wuerth_7499111446_Horizontal | J5, J9 |
| 2 | PCF85063AT/AAZ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6, U17 |
| 2 | X32K768S301 | PCM_Crystal_AKL:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1, Y3 |
| 1 | +5v BMC | TestPoint:TestPoint_Pad_2.0x2.0mm | TP16 |
| 1 | 0.005R | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 100K | Resistor_SMD:R_0402_1005Metric | R79 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 115K | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 1v2 | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | 20K | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 22.1K | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 3.3v BMC | TestPoint:TestPoint_Pad_D1.0mm | TP5 |
| 1 | 4.7µH | Inductor_SMD:L_Bourns-SRN4018 | L1 |
| 1 | 47K | Resistor_SMD:R_0402_1005Metric | R64 |
| 1 | 5v OTG | TestPoint:TestPoint_Pad_D1.0mm | TP17 |
| 1 | 6.04K | Resistor_SMD:R_0402_1005Metric | R29 |
| 1 | 74AHC1G04 | Package_TO_SOT_SMD:SOT-23-5 | U13 |
| 1 | 74AHC1G32 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | AP22653W6 | Package_TO_SOT_SMD:SOT-23-6 | U14 |
| 1 | AP63205WU | Package_TO_SOT_SMD:TSOT-23-6 | U1 |
| 1 | ASEK-32.768KHZ-L-R-T | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | U8 |
| 1 | BAT54C-7-F | Package_TO_SOT_SMD:SOT-23 | D2 |
| 1 | Battery_Cell | footprints:battery-S8411-45R | BT1 |
| 1 | Bus_M.2_Socket_M | footprints:M.2 M Key socket_rpi | J8 |
| 1 | CK | TestPoint:TestPoint_Pad_D1.0mm | TP13 |
| 1 | ComputeModule4 | CM4IO:Raspberry-Pi-4-Compute-Module | Module1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | DI | TestPoint:TestPoint_Pad_D1.0mm | TP8 |
| 1 | DMP3013SFV-7 | Package_SON:Diodes_PowerDI3333-8 | Q1 |
| 1 | DMP3098LQ-7 | DMP3098L:SOT-23_DMP3098LQ_DIO | MOSFET1 |
| 1 | DO | TestPoint:TestPoint_Pad_D1.0mm | TP9 |
| 1 | FEL | button-1571563-4:SW4_FSM-5P23_TEC | SW2 |
| 1 | FSUSB42MUX | Package_SO:MSOP-10_3x3mm_P0.5mm | U15 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | HOST_RESET | footprints:button-SW_TL3340AF160QG | SW4 |
| 1 | INA219AxDCN | Package_TO_SOT_SMD:SOT-23-8 | U4 |
| 1 | KSZ9131RNXI-TR | KSZ9131RNXI-TR:QFN48_NX_MCH | U12 |
| 1 | LED Green | LED_SMD:LED_0603_1608Metric | D7 |
| 1 | LED Red | LED_SMD:LED_0603_1608Metric | D8 |
| 1 | MMBZ5242BLT3G | MMBZ5240BLT1:SOT-23-3_1P4X3P040_ONS | D1 |
| 1 | MS | TestPoint:TestPoint_Pad_D1.0mm | TP7 |
| 1 | NMI_N | TestPoint:TestPoint_Pad_D1.0mm | TP19 |
| 1 | PCIe_nCLKREQ | TestPoint:TestPoint_Pad_D1.0mm | TP14 |
| 1 | PESD2USB5UX-T | Package_TO_SOT_SMD:SOT-23 | D9 |
| 1 | PHY_AVDDH(3.3v) | TestPoint:TestPoint_Pad_D1.0mm | TP10 |
| 1 | POWER | LED_SMD:LED_0603_1608Metric | D11 |
| 1 | POWER | footprints:button-SW_TL3340AF160QG | SW1 |
| 1 | RST | button-1571563-4:SW4_FSM-5P23_TEC | SW3 |
| 1 | SLB9670VQ20FW785XTMA1 | QFN32_SLB9670VQ20FW785XTMA1_INF:QFN32_SLB9670VQ20FW785XTMA1_INF | U23 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J12 |
The 269 most common of 276 parts.
Questions
How big is the Srvant mk2 PCB?
It measures 100 × 220 mm and has 6 copper layers, 1.61 mm thick.
What parts does the Srvant mk2 use?
276 parts, built around the 74LVC1G07SE-7-MS, KSZ9131RNXI-TR, AP63205WU and 74AHC1G08GW. 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 Srvant mk2 KiCad files?
From the lwolf/srvant-board repository on GitHub, at the commit this page was made from: the board is kicad/mk2/srvant-mk2/srvant-mk2.kicad_pcb and its schematic kicad/mk2/srvant-mk2/bmc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Srvant mk2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask lwolf before reusing the design.
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