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I²C is appropriate for peripherals where simplicity and low manufacturing cost are more important than speed. Common applications of the I²C bus are:
1. Reading configuration data from SPD EEPROMs on SDRAM, DDR SDRAM, DDR2 SDRAM memory sticks (DIMM) and other stacked PC boards
2. Supporting systems management for PCI cards, through an SMBus 2.0 connection.
3.Accessing NVRAM chips that keep user settings.
4. Accessing low speed DACs and ADCs.
5.Changing contrast, hue, and color balance settings in monitors (Display Data Channel).
6.Changing sound volume in intelligent speakers.
7.Controlling OLED/LCD displays, like in a cellphone.
8.Reading hardware monitors and diagnostic sensors, like a CPU thermostat and fan speed.
9. Reading real-time clocks.
10. Turning on and turning off the power supply of system components.
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