Solartron 7075 USB interface (SKiDL)
About the Solartron 7075 USB interface (SKiDL) PCB
Solartron 7075 USB interface (SKiDL) is an open source Raspberry Pi PCB design by cHemingway, published on GitHub. It is a 4-layer board measuring 112 × 44 mm, with 93 components from 38 distinct parts.
Its main chip is the RP2354A, from the Raspberry Pi family. Other key parts include the AP2112K-3.3TRG1, USBLC6-2SC6, 78L05 (SOT-89), TLP2361(TPL,E and 74HCT165D,653. By type, the board carries 37 capacitors, 27 resistors, 16 ICs, 4 diodes, 2 connectors and 2 switches.
It belongs with the power & battery designs in this gallery.
From the project
Tests of various "circuit as code" tools
An isolated USB interface for the Solartron 7075 DVM, described in SKiDL and laid out for KiCad 10. It plugs into the 50-way Cannon socket (SKB) of the 7075's Parallel BCD Interface Unit 70754 (service manual section 9). From there it reads the display data and status lines, drives all the remote-control inputs, and connects to a host over USB through an RP2354A.
Main components on the Solartron 7075 USB interface (SKiDL)
Solartron 7075 USB interface (SKiDL) bill of materials (BOM)
93 components, 38 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | RP2354A Raspberry Pi | QFN-60-1EP_7x7mm_P0.4mm_EP3.4x3.4mm_ThermalVias | U1 |
| 1 | AP2112K-3.3TRG1 AP2112K-3.3 Diodes Incorporated | SOT-23-5 | U2 |
| 1 | USBLC6-2SC6 STMicroelectronics | SOT-23-6 | U3 |
| 1 | 78L05 (SOT-89) 78L05 UMW | SOT-89-3 | U4 |
| 5 | TLP2361(TPL,E TLP2361 Toshiba | Toshiba_SOIC-5-6_4.4x3.6mm_P1.27mm | U5, U6, U7, U8, U9 |
| 5 | 74HCT165D,653 74HCT165 Nexperia | SOIC-16_3.9x9.9mm_P1.27mm | U10, U11, U12, U13, U14 |
| 2 | 74HC595D,118 74HC595 Nexperia | SOIC-16_3.9x9.9mm_P1.27mm | U15, U16 |
| 1 | 2N7002 CJ | SOT-23 | Q1 |
| 1 | ABM8-272-T3 12MHz Abracon | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 5787834-1 USB_B TE Connectivity | USB_B_TE_5787834_Vertical | J2 |
| 1 | PZ254V-11-03P SWD XFCN | PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | SMD1206P050TF 500mA RUILON | Fuse_1206_3216Metric | F1 |
| 1 | B0509S-1WR3 EVISUN | Converter_DCDC_Murata_MEE1SxxxxSC_THT | PS1 |
| 1 | TS-1187A-B-A-B BOOTSEL XKB Connection | SW_Push_1P1T_XKB_TS-1187A | SW1 |
| 1 | TS-1187A-B-A-B RESET XKB Connection | SW_Push_1P1T_XKB_TS-1187A | SW2 |
| 3 | LTST-C190KGKT green Lite-On | LED_0603_1608Metric | D1, D2, D3 |
| 1 | KT-0603R red Hubei KENTO | LED_0603_1608Metric | D4 |
| 1 | AOTA-B201610S3R3-101-T 3.3uH Abracon | L_Murata_DFE201610P | L1 |
| 1 | 0603B472K500NT 4.7n FH | C_0603_1608Metric | C1 |
| 3 | CL10A106KP8NNNC 10u Samsung | C_0603_1608Metric | C2, C4, C25 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | CL10A105KB8NNNC 1u Samsung | C_0603_1608Metric | C3, C24 |
| 12 | CL05B104KO5NNNC 100n Samsung | C_0402_1005Metric | C5, C6, C7, C8, C9, C10, C11, C12 +4 |
| 3 | CL05A475MP5NRNC 4.7u Samsung | C_0402_1005Metric | C14, C15, C16 |
| 2 | 0402CG150J500NT 15p FH | C_0402_1005Metric | C20, C21 |
| 1 | CL10A475KO8NNNC 4.7u Samsung | C_0603_1608Metric | C22 |
| 1 | CL10A225KO8NNNC 2.2u Samsung | C_0603_1608Metric | C23 |
| 12 | CC0603KRX7R9BB104 100n YAGEO | C_0603_1608Metric | C26, C27, C28, C29, C30, C31, C32, C33 +4 |
| 1 | 0603WAF1004T5E 1M UNI-ROYAL | R_0603_1608Metric | R1 |
| 3 | 0603WAF1001T5E 1k UNI-ROYAL | R_0603_1608Metric | R2, R11, R13 |
| 1 | 0402WGF330JTCE 33 UNI-ROYAL | R_0402_1005Metric | R3 |
| 3 | 0402WGF1001TCE 1k UNI-ROYAL | R_0402_1005Metric | R4, R8, R9 |
| 2 | 0402WGF270JTCE 27 UNI-ROYAL | R_0402_1005Metric | R5, R6 |
| 1 | 0402WGF1002TCE 10k UNI-ROYAL | R_0402_1005Metric | R7 |
| 1 | 0603WAF2201T5E 2.2k UNI-ROYAL | R_0603_1608Metric | R10 |
| 1 | 0603WAF1003T5E 100k UNI-ROYAL | R_0603_1608Metric | R12 |
| 4 | 0603WAF3900T5E 390 UNI-ROYAL | R_0603_1608Metric | R14, R15, R16, R17 |
| 1 | 0603WAF8200T5E 820 UNI-ROYAL | R_0603_1608Metric | R18 |
| 9 | 4D03WGJ0103T5E 10k UNI-ROYAL | R_Array_Convex_4x0603 | RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8 +1 |
Solartron 7075 USB interface (SKiDL) design files
The KiCad project lives in the cHemingway/llm_circuitgen_tests repository on GitHub; these links point at the commit this page was built from.
Solartron 7075 USB interface (SKiDL): common questions
What microcontroller does the Solartron 7075 USB interface (SKiDL) use?
The Solartron 7075 USB interface (SKiDL) is built around the RP2354A, from the Raspberry Pi family.
How big is the Solartron 7075 USB interface (SKiDL) PCB?
The Solartron 7075 USB interface (SKiDL) measures 112 × 44 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Solartron 7075 USB interface (SKiDL)?
93 components, from 38 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 Solartron 7075 USB interface (SKiDL) design files?
From the cHemingway/llm_circuitgen_tests 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 Solartron 7075 USB interface (SKiDL) design in my own project?
The repository has no license, so all rights stay with cHemingway. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Solartron 7075 USB interface (SKiDL) without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.
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