SMBus

SMBus, designed by Intel and Duracell, is very similar to I²C from Philips. It is a single-ended two-wire protocol. It supports V_DD from 3V to 5V (SMBus 2.0) or 1.8V to 5V (SMBus 3.0).

Standards

• SMBus 3.1.1, 2024-10-20
• SMBus 3.0, 2014-12-20
• SMBus 2.0, 2000-08-03
• SMBus 1.0, 1995-12-15

Differences from I²C

• Clock low timeout at 35ms, and a minimum clock frequency of 10 kHz to support this.
• Shared alert/interrupt signal