Notes on I2C
I2C, or Inter-Integrated Circuit, is a synchronous, two-wire serial communication bus designed for connecting low-speed peripherals over short distances. It operates with a single controller and one or more targets, utilizing an open-drain system for data transfer. The bus arbitration process allows multiple controllers to share the bus without conflicts, relying on a passive electrical design to manage data transmission.
- ▪I2C uses two lines: SDA for data and SCL for clock signals.
- ▪The system is designed to allow multiple controllers to share the bus using open-drain logic.
- ▪Arbitration occurs passively, allowing controllers to transmit without conflicts as long as their signals are identical.
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| Original publisher | Rana-emaan |
| Canonical URL | https://rana-emaan.com/read/notes/i2c/ |
| Publication time | Wed, 20 May 2026 13:52:40 -0500 |
| Retrieval time | 2026-05-20T19:05:02.971Z |
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Home / Read / Notes / I2C Updated: May 14, 2026 ✱ Created: May 7, 2026 ✱ Embedded I rewrote this like 3 times over the course of 7 days and spent way too long on these diagrams so hopefully this is up to snuff. I2C Stands for Inter-Integrated Circuit and abbreviated as I2C or just I2C. It is a synchronous, two-wire serial communication bus used to connect low-speed peripherals over short distances. SDA Stands for Serial DAta. Transfers data bidirectionally between devices. SCL Stands for Serial CLock. Carries the clock signal to synchronize all data transfers. Topology There is always at least one controller and one target. Commonly there is a single controller and one or more targets. Uncommonly, there can be multiple controllers (multi-controller).
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