Editing I²C (section)

==Slave devices==
Many chips supporting I²C have higher bits of the address fixed, and lower bits configurable through one or more pins.

{|class="wikitable"
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! Class !! Device !! Address byte !! Notes
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| Trackball || PIM447 || 0 0 0 0 1 0 1 A || Could be added to mini keyboards
|-
| Other hand || [[Pro Micro]] || 0 0 1 1 0 0 1 R/{{overline|W}} || Slave hand (left or right) on many split kit keyboards using [[QMK]] firmware. Unless overridden, the MCU makes itself slave if it does not detect VBUS.
|-
| I/O Expander || MCP23018 || 0 1 0 0 A2 A1 A0 R/{{overline|W}} || [[ErgoDox]]
|-
| I/O Expander || MCP23017 || 0 1 0 0 A2 A1 A0 R/{{overline|W}} || Functionally equivalent to MCP23018 but electrically less robust
|-
| OLED display || SSD1306 || 0 1 1 1 1 0 A0 R/{{overline|W}} || [[Lily58]] and others
|-
| EEPROM || Atmel AT24C16C || 1 0 1 0 B2 B1 B0 R/{{overline|W}} || Modified [[ErgoDox]]en and [[Kinesis Advantage]]. Not recommended for new devices.
|-
| EEPROM || Atmel AT24C164 || 1 A2 A1 A0 B2 B1 B0 R/{{overline|W}} || A1 is inverted so that A2-A1-A0 is 0-1-0 if all three address pins are connected to GND. B2-B2-B1 selects 256-byte block.
|-
| EEPROM || Microchip 24LC64 || 1 0 1 0 A2 A1 A0 R/{{overline|W}} || Not compatible with Atmel AT24C16x above
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| LED matrix || ISSI IS31FL3733 || 1 0 1 A3 A2 A1 A0 R/{{overline|W}} || [[Input Club K-Type]] (RGB) and others. 192 LEDs (64 RGB)
|-
| LED matrix || ISSI IS31FL3731 || 1 1 1 0 1 A1 A0 R/{{overline|W}} || [[Input Club]] Infinity60 and others. 144 charlieplexed LEDs.
|-
|}