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mcp23017 extender

9 months ago 214
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Description

=I2C GPIO extender=

Test implementation (SHOULD be enhanced/optimized) for 12 non-isolated and 4 isolated hardware de-bounced inputs for my OrangePi-Zero 'pseudo PLC'.

Can be used as dedicated I2C extender with single hardware IRQ line with possible any I2C capable controller. Included level shifting circuit make it compatible with 3.3V MCUs.

Documents

GPIO_IN

DI_PCB

BOM

ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted
1 XC6206P332MR U1 SOT-23(SOT-23-3) 1 XC6206P332MR TOREX LCSC Yes Yes C5446
2 1u C2,C3,C6,C7,C8,C9,C4,C5,C10,C11,C14,C15,C16,C17,C20,C21,C12,C13 0805 18 Yes
3 BSS138 Q2,Q1 SOT-23-3 2 BSS138 CJ LCSC Yes C78284
4 10k R2,R4,R1,R3,R56,R49,R50,R51 0805 8 Yes
5 0.01 C1 0805 1 Yes
6 MCP23017-E/SO U4 SOIC-28_300MIL 1 MCP23017-E/SO MICROCHIP LCSC Yes C47023
7 3k3 R7,R21,R8,R22,R9,R23,R10,R24,R5,R19,R6,R20,R11,R27,R12,R28,R33,R41,R34,R42,R31,R39,R32,R40 0805 24 Yes
8 33k R15,R16,R17,R18,R13,R14,R25,R26,R37,R38,R43,R44,R52,R53,R35,R36 0805 16 Yes
9 5.1V D5,D6,D7,D8,D3,D4,D9,D10,D13,D14,D11,D12 MELF 12 Yes ZM4733A
10 EL357N U2,U3,U5,U6 SOP-4_P2.54 4 EL357N(A)(TA)-G EVERLIGHT LCSC Yes C142286
11 1N4448 D15,D16,D17,D18 LL34 4 1N4448 SEMTECH LCSC Yes C54037
12 1k* R29,R30,R47,R48 1206 4 Yes
13 470 R45,R46,R54,R55 0805 4 Yes
14 0.1 C18,C19 0805 2 Yes
15 PRTR5V0U2X,215 D1,D2 SOT-143 2 PRTR5V0U2X,215 Nexperia LCSC Yes C12333
16 0 J3,J2,J1 0603 3 No
17 DA250-350 X1,X3 DA250-350-5 2 Yes DA250-350-5
18 DA250-350 X2 DA250R-350-5 1 Yes
19 DA250-250 X4 DA250-350-8 1 Female headerHDR1X8-2.54 BOOMELE LCSC Yes C27438
20 BAT54S D19 SOT-23(SOT-23-3) 1 BAT54S SEMTECH LCSC Yes C83935
21 DA250-350 X5 DA250R-350-8 1 Yes

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