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Inter-integrated circuit (I 2 C) interface
Table 170. SMBus vs. I 2 C (continued)
SMBus
Different address types (reserved, dynamic etc.)
Different bus protocols (quick command, process
call etc.)
RM0008
I 2 C
7-bit, 10-bit and general call slave address
types
No bus protocols
SMBus application usage
With System Management Bus, a device can provide manufacturer information, tell the
system what its model/part number is, save its state for a suspend event, report different
types of errors, accept control parameters, and return its status. SMBus provides a control
bus for system and power management related tasks.
Device identification
Any device that exists on the System Management Bus as a slave has a unique address
called the Slave Address. For the list of reserved slave addresses, refer to the SMBus
specification ver. 2.0 ( http://smbus.org/specs/ ).
Bus protocols
The SMBus specification supports up to 9 bus protocols. For more details of these protocols
and SMBus address types, refer to SMBus specification ver. 2.0 ( http://smbus.org/specs/ ).
These protocols should be implemented by the user software.
Address resolution protocol (ARP)
SMBus slave address conflicts can be resolved by dynamically assigning a new unique
address to each slave device. The Address Resolution Protocol (ARP) has the following
attributes:
●
●
●
●
Address assignment uses the standard SMBus physical layer arbitration mechanism
Assigned addresses remain constant while device power is applied; address retention
through device power loss is also allowed
No additional SMBus packet overhead is incurred after address assignment. (i.e.
subsequent accesses to assigned slave addresses have the same overhead as
accesses to fixed address devices.)
Any SMBus master can enumerate the bus
Unique device identifier (UDID)
In order to provide a mechanism to isolate each device for the purpose of address
assignment, each device must implement a unique device identifier (UDID).
For the details on 128 bit UDID and more information on ARP, refer to SMBus specification
ver. 2.0 ( http://smbus.org/specs/ ).
SMBus alert mode
SMBus Alert is an optional signal with an interrupt line for devices that want to trade their
ability to master for a pin. SMBALERT is a wired-AND signal just as the SCL and SDA
signals are. SMBALERT is used in conjunction with the SMBus General Call Address.
Messages invoked with the SMBus are 2 bytes long.
636/995
Doc ID 13902 Rev 9
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