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This boards should provide SPI I/O expansion based on the MCP23S17. The boards should be stackable since the layout of the SPI connector is the same for all boards. The Digital Input and the Digital Relay Output are galvanically isolated. Prototype has been tested with a Teensy 3.2 but any other SPI capable processor should work. All In and Out power supply must be provided by external power supply since only the non isolated part is powered by the processor power.







ID Name Designator Footprint Quantity BOM_Supplier BOM_Manufacturer Part BOM_Supplier Part
1 MCP23S17-E/SP U1,U2,U9 DIP-28_300MIL 3 LCSC MCP23S17-E/SP C148096
2 2.54mm 2*20PFemale header P1,P2,P3 HDR-20X2/2.54 3 LCSC 2.54mm 2*20PFemale header C50982
3 MF-R005-0-99 F1 F-0.05A 1 LCSC MF-R005-0-99 C89659
4 100nF C1,C2,C3 CAP-0.2 3 LCSC CT4-1206B104K251F3 C93117
5 210S-2*4P L=11.6MMGold-plated black H1,H2,H3 DIP-2X4P-2.54MM-M 3 LCSC 210S-2*4P L=11.6MMGold-plated black C124386
6 1KΩ RN1,RN2 SIP-9 2 LCSC A09-102JP C9111
7 210S-1*3P L=11.6MMGold-plated black AG,AA,A+,AG1,AA1,A+1,AG2,AA2,A+2 DIP-1X3P-2.54MM-M 9 LCSC 210S-1*3P L=11.6MMGold-plated black C124376
8 LTV-847 U5,U6,U7,U8 DIP-16_W7.62MM 4 LCSC LTV-847 C10794
9 ULN2803APG U3,U4 DIP-18 2 LCSC ULN2803APG C5252
10 A16-400 F2 F-4.00A-16V 1 LCSC A16-400 C135392
11 RL16-400 F3,F4 F-4.00A-16V 2 LCSC RL16-400 C20839
12 AQY210EH K0,K1,K2,K3,K4,K5,K6,K7,K8,K9,K10,K11,K12,K13,K14,K15 DIP-4 16 LCSC AQY210EH C13541
13 300 R8,R9,R10,R11,R12,R13,R14,R15,R0,R1,R2,R3,R4,R5,R6,R7 RES_0603 16 LCSC AR03DTC3000 C374566




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