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C4
Capacitance
0.1uF
+3V3
+3V3
+3V3
A3
B1
A6
ESP_IO32
A1
ESP_IO33
A7
A0
B2
A2
B7
ESP_IO35
SDA
B6
SCL
B3
B0
ESP_IO34
A5
A4
B4
B5
U2
Manufacturer Part Number
MCP23017-E/SO

[Example] ESP32 Reference Design