Eps
About the Eps PCB
Eps is an open source STM32 PCB design by OSUSat, published on GitHub under the MIT license. It is a 6-layer board measuring 80 × 80 mm, with 357 components from 104 distinct parts.
Its main chip is the STM32L496ZGTx, from the STM32 family. Other key parts include the CM4, MCP2517FD-XJHA, LTC4162-L, SN65HVD230 and 74LVC1G07. By type, the board carries 135 resistors, 116 capacitors, 44 ICs, 20 transistors, 12 connectors and 12 diodes.
It belongs with the rf & radio, science & space and power & battery designs in this gallery.
From the project
Open Source Earth Imaging Satellite Hardware + Firmware
Welcome to the central repository for the OSUSat Climate Science CubeSat project. This repository contains the hardware designs, firmware, and documentation for the sub-systems comprising the satellite.
The OSUSat Climate Science CubeSat is a low-Earth orbit (LEO) satellite designed to capture high-resolution imagery and scientific data for climate science research.
Main components on the Eps
Eps bill of materials (BOM)
357 components, 104 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CM4 TPS22810DRV | WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm | U1 |
| 1 | MCP2517FD-XJHA LTC3130 | MSOP-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm | U2 |
| 1 | LTC4162-L | QFN-28-1EP_4x5mm_P0.5mm_EP2.65x3.65mm | U3 |
| 1 | SN65HVD230 LTC4162-L | QFN-28-1EP_4x5mm_P0.5mm_EP2.65x3.65mm | U4 |
| 1 | MCP2517FD-XJHA NCS214RSQT2G | SOT-363_SC-70-6 | U5 |
| 1 | 74LVC1G07 74LVC1G07SE-7 | SOT-353_SC-70-5 | U6 |
| 1 | SN65HVD230 ~ | SOT-23-6 | U7 |
| 8 | TPS22810DRVR | WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm | U8, U14, U18, U22, U26, U30, U34, U38 |
| 1 | DRV8846 MAX6369 | SOT-23-8 | U9 |
| 1 | STM32L496ZGTx | LQFP-144_20x20mm_P0.5mm | U10 |
| 7 | NCS214RSQT2G | SOT-363_SC-70-6 | U11, U15, U19, U23, U27, U31, U35 |
| 7 | 74LVC1G07SE-7 | SOT-353_SC-70-5 | U12, U16, U20, U24, U28, U32, U36 |
| 7 | ~ | SOT-23-6 | U13, U17, U21, U25, U29, U33, U37 |
| 2 | MP28167-A | MPS_QFN-16_3x3mm_P0.5mm | U39, U40 |
| 2 | LTC4415 | MSOP-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm | U41, U42 |
| 2 | SN65HVD230 | SOIC-8_3.9x4.9mm_P1.27mm | U43, U44 |
| 4 | NMOS | TRANS_FDMC8327L | Q1, Q2, Q3, Q4 |
| 16 | IRLML0030 | SOT-23 | Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 +8 |
| 1 | 8MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 32KHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
Show 84 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | USB_C_Receptacle_USB2.0_16P | USB_C_Receptacle_Palconn_UTC16-G | J1 |
| 1 | ARJM11C7-502-AB Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | USB_C_RECEPTACLE_USB2.0_16P Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3 |
| 1 | CONN_02X04_ODD_EVEN Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J4 |
| 1 | CONN_01X05 Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J5 |
| 3 | Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J6, J7, J8 |
| 1 | Conn_01x03 | JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J9 |
| 1 | CONN_02X20_ODD_EVEN Conn_01x03 | JST_PH_S3B-PH-K_1x03_P2.00mm_Horizontal | J10 |
| 1 | Conn_ARM_JTAG_SWD_10 | PinHeader_2x05_P1.27mm_Vertical_SMD | J11 |
| 1 | Conn_02x20_Counter_Clockwise | Samtec_ERM8-020-XX.X-DV_2x20_P0.8mm_Terminal | J12 |
| 6 | Polyfuse | Fuse_0402_1005Metric | F1, F2, F3, F4, F5, F6 |
| 1 | JUMPER_2_OPEN Jumper | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | SW_Push | SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | SW_SPDT | SW_SPDT_PCM12 | SW2 |
| 6 | D_TVS | D_SOD-523 | D1, D3, D5, D7, D9, D11 |
| 6 | D_Schottky | D_SOD-323 | D2, D4, D6, D8, D10, D12 |
| 2 | 120R | L_0603_1608Metric | FB1, FB2 |
| 1 | 6.8uH | L_Sunlord_SWPA4018S | L1 |
| 2 | 6.8u | L_Vishay_IHLP-2020 | L2, L3 |
| 2 | 4.7u | L_KOHERelec_MDA5030 | L4, L5 |
| 1 | 100N 47uF | C_1206_3216Metric | C1 |
| 1 | 10U 4.7uF | C_0402_1005Metric | C2 |
| 1 | 2.2U 1uF | C_0402_1005Metric | C3 |
| 1 | 100N 22n | C_0402_1005Metric | C4 |
| 7 | 22n | C_0402_1005Metric | C5, C14, C21, C89, C92, C101, C104 |
| 1 | 22u | C_1206_3216Metric | C6 |
| 4 | 4.7u | C_0402_1005Metric | C7, C8, C19, C46 |
| 2 | 100N 4.7u | C_0402_1005Metric | C9, C12 |
| 2 | 100N 100n | C_0402_1005Metric | C10, C13 |
| 1 | 100N 1u | C_0402_1005Metric | C11 |
| 1 | 100N 10u | C_0402_1005Metric | C15 |
| 1 | 100N 10u | C_1206_3216Metric | C16 |
| 56 | 100n | C_0402_1005Metric | C17, C20, C24, C25, C28, C29, C30, C31 +48 |
| 4 | 1u | C_0402_1005Metric | C18, C36, C90, C102 |
| 1 | 10u | C_0402_1005Metric | C22 |
| 1 | 10u | C_1206_3216Metric | C23 |
| 8 | 1uF | C_0402_1005Metric | C26, C54, C59, C64, C69, C74, C79, C84 |
| 2 | 20p | C_0402_1005Metric | C38, C40 |
| 2 | 1u | C_0805_2012Metric | C47, C49 |
| 2 | 10p | C_0402_1005Metric | C48, C50 |
| 1 | 10n | C_0402_1005Metric | C51 |
| 2 | 100u | CP_EIA-7343-15_Kemet-W | C87, C99 |
| 2 | 22u | C_0603_1608Metric | C88, C100 |
| 10 | 22u | C_0805_2012Metric | C94, C95, C96, C97, C98, C106, C107, C108 +2 |
| 2 | 4.7u | C_1206_3216Metric | C111, C112 |
| 2 | 5.1k | R_0402_1005Metric | R1, R2 |
| 1 | 5.1K 10M | R_0402_1005Metric | R3 |
| 1 | 5.1K 1M | R_0402_1005Metric | R4 |
| 15 | 100k | R_0402_1005Metric | R5, R22, R30, R47, R53, R59, R65, R71 +7 |
| 17 | 0 | R_0402_1005Metric | R6, R21, R25, R46, R50, R52, R56, R58 +9 |
| 1 | 5.1K 18k | R_0402_1005Metric | R7 |
| 1 | 12K 18k | R_0402_1005Metric | R8 |
| 4 | 4.7k | R_0402_1005Metric | R9, R10, R15, R16 |
| 1 | 16m | R_1206_3216Metric | R11 |
| 1 | 120 63.4k | R_0402_1005Metric | R12 |
| 1 | 120 10k | R_0402_1005Metric | R13 |
| 2 | 10m | R_1206_3216Metric | R14, R20 |
| 1 | 51K 16m | R_1206_3216Metric | R17 |
| 1 | 51K 63.4k | R_0402_1005Metric | R18 |
| 8 | 10k | R_0402_1005Metric | R19, R29, R89, R90, R96, R97, R109, R112 |
| 24 | 1M | R_0402_1005Metric | R23, R24, R26, R48, R49, R51, R54, R55 +16 |
| 2 | 2k | R_0402_1005Metric | R27, R102 |
| 1 | 390 | R_0402_1005Metric | R28 |
| 7 | 20m | R_1206_3216Metric | R31, R35, R37, R39, R41, R43, R45 |
| 2 | 140k | R_0402_1005Metric | R32, R34 |
| 1 | 2m | R_1206_3216Metric | R33 |
| 1 | 200k | R_0402_1005Metric | R36 |
| 2 | 300k | R_0402_1005Metric | R38, R42 |
| 1 | 49.9k | R_0402_1005Metric | R40 |
| 1 | 20k | R_0402_1005Metric | R44 |
| 4 | 499k | R_0402_1005Metric | R88, R91, R95, R98 |
| 1 | 900k | R_0402_1005Metric | R92 |
| 2 | 430k | R_0402_1005Metric | R93, R100 |
| 1 | 187k | R_0402_1005Metric | R94 |
| 1 | 806k | R_0402_1005Metric | R99 |
| 1 | 107k | R_0402_1005Metric | R101 |
| 1 | 1k | R_0402_1005Metric | R103 |
| 2 | 680k | R_0402_1005Metric | R104, R113 |
| 4 | 50k | R_0402_1005Metric | R107, R108, R116, R117 |
| 4 | 470k | R_0402_1005Metric | R110, R111, R119, R120 |
| 10 | 1.5k | R_0402_1005Metric | R122, R123, R124, R125, R126, R127, R128, R129 +2 |
| 1 | 402k | R_0402_1005Metric | R132 |
| 2 | 51k | R_0402_1005Metric | R134, R136 |
| 2 | 120 | R_0402_1005Metric | R135, R137 |
Eps design files
The KiCad project lives in the OSUSat/cubesat repository on GitHub; these links point at the commit this page was built from.
Eps: common questions
What microcontroller does the Eps use?
The Eps is built around the STM32L496ZGTx, from the STM32 family.
How big is the Eps PCB?
The Eps measures 80 × 80 mm, has 6 copper layers and is 1.6 mm thick.
How many components are on the Eps?
357 components, from 104 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Eps design files?
From the OSUSat/cubesat repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Eps design in my own project?
Yes, under the terms of its MIT license, which OSUSat chose for the repository.
Can I test firmware for the Eps without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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