Scarab
About the Scarab PCB
Scarab is an open source NXP PCB design by makemob, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 120 × 85 mm, with 101 components from 51 distinct parts.
Its main chip is the LPC1114FDH28/102, from the NXP family. Other key parts include the TPS54061DRBR, MIC5205-3.3YM5, CS70P, MIC4605-1YM and MAX3485CSA+. By type, the board carries 29 capacitors, 29 resistors, 19 diodes, 7 ICs, 7 connectors and 6 transistors.
It belongs with the sensors designs in this gallery.
From the project
H-Bridge motor/actuator controller
- Based around NXP LPC1114 Microcontroller - 13-48VDC input (36V nominal) - 8A average current output - 12VDC max 200mA auxiliary output - 3.3VDC auxiliary output ~40mA at 25 deg C, <10mA at 85 deg C - Good to 85 deg C ambient (in theory) - RS-485 comms, aux analog and digital I/O - 3 x indicator LEDs - NTC temperature sensor - Battery voltage sensing
Designed to drive Linak LA-35 linear actuators for the MakeMob UKI - Utility Kinetic Insect project http://makemob.net/portfolio_page/uki-electric-insect-vehicle/
Main components on the Scarab
Scarab bill of materials (BOM)
101 components, 51 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LPC1114FDH28/102 NXP | TSSOP-28 | U1 |
| 1 | TPS54061DRBR TPS54061 Texas Instruments | VSON8 | U2 |
| 1 | MIC5205-3.3YM5 Microchip | SOT-23-5 | U3 |
| 1 | CS70P ST_CS70 STMicroelectronics | TSSOP8 | U4 |
| 2 | MIC4605-1YM Microchip | SOIC-8_Pitch1.27mm | U5, U6 |
| 1 | MAX3485CSA+ MAX3485 Maxim Integrated | SOIC-8_Pitch1.27mm | U7 |
| 4 | IPD35N10S3L-26 Infineon | TO-252-2Lead | Q1, Q2, Q3, Q4 |
| 2 | MMUN2211LT1G ON Semiconductor | SOT-23_Handsoldering | Q5, Q6 |
| 1 | FOXSDLF/120R-20 12MHz 20pF Fox | Crystal_FOX_HC | Y1 |
| 1 | 691311500102 BATT Wurth Electronics | Connector_5.08mm_Pitch_2way | P1 |
| 1 | 691311500102 MOTOR Wurth Electronics | Connector_5.08mm_Pitch_2way | P2 |
| 1 | PASSTHRU | Connector_5.08mm_Pitch_2way | P3 |
| 1 | 20020107-C081A01LF AUX_A FCI / Amphenol | Connector_3.5mm_Pitch_8way | P4 |
| 1 | 20020107-C051A01LF AUX_B FCI / Amphenol | Connector_3.5mm_Pitch_5way | P5 |
| 1 | 20020107-C061A01LF COMMS FCI / Amphenol | Connector_3.5mm_Pitch_6way | P6 |
| 1 | 20021121-00010C4LF ISP FCI / Amphenol | CON_02X05_1.27 | P7 |
| 1 | 751.0062 8A Schurter | Fuseholder_5x20_Schurter | F1 |
| 1 | NTCS0805E3103JMT Vishay | R_0805_HandSoldering | TH1 |
| 4 | NF | SMC_Handsoldering | D1, D2, D3, D4 |
| 1 | SMBJ64CA TVS Fairchild Semiconductor | SMB_Handsoldering | D5 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BAV99LT1G BAV99 ON Semiconductor | SOT-23_Handsoldering | D6 |
| 1 | NF | SOT-23 | D7 |
| 2 | SMAJ12CA TVS 12V AVX | DO-214AC_Handsoldering | D8, D9 |
| 1 | LTST-C171KRKT RED Lite-On | LED_0805 | D10 |
| 1 | LTST-C170TBKT BLUE Lite-On | LED_0805 | D11 |
| 1 | LTST-C171GKT GREEN Lite-On | LED_0805 | D12 |
| 6 | NF | DO-214AC_Handsoldering | D13, D14, D15, D16, D17, D18 |
| 1 | BZX84C3V0LT1G 3V ON Semiconductor | SOT-23 | D19 |
| 1 | SDR0604-221KL 220uH 1.57R Bourns | INDUCTOR_SDR0604 | L1 |
| 1 | UPW1J151MPD 150uF Nichicon | C_Radial_D10_L20_P5 | C1 |
| 1 | GRM31CR72A225KA73L 2.2uF Murata | C_1206_HandSoldering | C2 |
| 8 | NF | C_0805_HandSoldering | C3, C14, C19, C22, C25, C26, C27, C28 |
| 2 | C2012X7R1E105K125AB 1uF TDK | C_0805_HandSoldering | C4, C5 |
| 4 | C2012X7R1E105K125AB 1uF 25V X7R TDK | C_0805_HandSoldering | C6, C7, C11, C13 |
| 4 | 885012207092 10nF Wurth Electronics | C_0805_HandSoldering | C8, C18, C23, C29 |
| 1 | 08051A680FAT2A 68pF AVX | C_0805_HandSoldering | C9 |
| 1 | GRM2165C1H751JA01D 750pF Murata | C_0805_HandSoldering | C10 |
| 1 | GRM21BR61E106MA73L 10uF Murata | C_0805_HandSoldering | C12 |
| 4 | 885012207072 100nF Wurth Electronics | C_0805_HandSoldering | C15, C16, C17, C21 |
| 2 | 08055A390JAT2A 39pF AVX | C_0805_HandSoldering | C20, C24 |
| 7 | CRCW08050000Z0EA 0R Vishay | R_0805_HandSoldering | R1, R2, R8, R9, R11, R15, R17 |
| 8 | NF | R_0805_HandSoldering | R3, R4, R10, R14, R20, R21, R22, R23 |
| 1 | CRCW080597K6FKEA 97.6k Vishay | R_0805_HandSoldering | R5 |
| 1 | LRMAM2512-R01FT4 0.01R 1W TT Electronics | R_2512_HandSoldering | R6 |
| 1 | CRCW0805158KFKEA 158k Vishay | R_0805_HandSoldering | R7 |
| 1 | CRCW0805140KFKEA 140k Vishay | R_0805_HandSoldering | R12 |
| 3 | CRCW080510K0FKEA 10k Vishay | R_0805_HandSoldering | R13, R28, R29 |
| 1 | CRCW08051K00FKEA 1k Vishay | R_0805_HandSoldering | R16 |
| 2 | CRCW080547K0FKEA 47k Vishay | R_0805_HandSoldering | R18, R19 |
| 3 | CRCW08051K80FKEA 1k8 Vishay | R_0805_HandSoldering | R24, R25, R26 |
| 1 | CRCW0805120KFKEA 120k Vishay | R_0805_HandSoldering | R27 |
Scarab design files
The KiCad project lives in the makemob/Scarab repository on GitHub; these links point at the commit this page was built from.
Scarab: common questions
What microcontroller does the Scarab use?
The Scarab is built around the LPC1114FDH28/102, from the NXP family.
How big is the Scarab PCB?
The Scarab measures 120 × 85 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Scarab?
101 components, from 51 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 Scarab design files?
From the makemob/Scarab repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Scarab design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which makemob chose for the repository.
Can I test firmware for the Scarab without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.
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