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STD Raspberry Pi 40-channel daisy-chainable IO expander

License: CC-BY-NC-SA 3.0

Mode: Editors' pick

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Update time: 2021-10-24 06:27:40
Creation time: 2020-04-13 00:09:22
Description
Dual MCP23017 + GPIO Daisy-chainable IO expander for Raspberry Pi. Uses swappable daughterboards for flexibility, compatible with the common txs0108e level converter boards. See https://easyeda.com/MadOverlord/io-expander-daughterboard for a MIC2981/Passthrough daughterboard, and https://easyeda.com/MadOverlord/io-expander-voltage-divider-daughterboard for a voltage divider daughterboard (for reducing higher voltage input signals down to 3v3 for the MCP chips.
Design Drawing
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ID Name Designator Footprint Quantity
1 HDR-IDC-2.54-2X20P RBP-B,RBP-A HDR-IDC-2.54-2X20P_NO_OUTLINE 2
2 SOLDERJUMPERNO SJ2,SJ1,SJ3,SJ4,SJ5,A1-1,GJ-23,GJ-16,GJ-22,GJ-21,GJ-20,GJ-19,GJ-7,GJ-6,A0-0,A1-0,A2-0,A2-1,GJ-5,A0-1,GJ-4,GJ-18,GJ-0,GJ-1,GJ-2,GJ-3,GJ-17 SJ_2S-NO 27
3 Header-Female-2.54_1x10 J6,J7,J10,J1,J9,J5,J4,J8,J3,J2 HDR-TH_10P-P2.54-V 10
4 Header-Male-2.54_1x4 INTERRUPTS DIP-1X4P-2.54MM-M_NO 1
5 Header-Male-2.54_1x3 ENABLE-FIXED,PWR-TSX-OUT,PWR-TSX-IN,PWR-MCP HDR-TH_3P-P2.54-V 4
6 Header-Male-2.54_1x5 TSX-OE DIP-1X5P-2.54MM-M NO-LINES 1
7 RASPBERRY PI FOOTPRINT RBP1 RASPBERRY PI FOOTPRINT_NO 1
8 B2B-XH-A (LF)(SN) EXT-TSX-OUT1,EXT-TSX-IN1,EXT-MCP,EXT-TSX-IN,EXT-TSX-OUT,EXT-MCP1 CONN-TH_B2B-XH-A (LF)(SN) 6
9 TXS0108E DAUGHTERBOARD TSX-GPIO,TSX-1-2,TSX-0-1,TSX-0-2,TSX-1-1 TXS0108E DAUGHTERBOARD 5
10 4.7K RN-MCP-0,RN-MCP-1,RN-TSX-OE1,RN-0-2,RN-0-1,RN-1-4,RN-1-3,RN-1-1,RN-0-3,RN-1-2,RN-1-5,RN-1-6,RN-0-4,RN-TSX-OE2,RN-OUT-2,RN-OUT-9,RN-OUT-10,RN-OUT-8,RN-OUT-7,RN-OUT-6,RN-OUT-5,RN-OUT-4,RN-OUT-1,RN-OUT-3 RES-ARRAY-SMD_0603-8P-L3.2-W1.6-BL 24
11 100nF C1,C2 C0805 2
12 MCP23017-E/SO MCP-0,MCP-1 SOIC-28_L18.1-W10.3-P1.27-LS10.3-BL 2
13 Header-Male-2.54_1x8 GPIO 210S-1X8P 1
14 210S-2*10PL=11.6MM IDC-0-2,IDC-20-3,IDC-0-3,IDC-20-0,IDC-0-0,IDC-0-1,IDC-20-1,IDC-20-2 210S-2.54-2X10P-NO_OUTLINE 8

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