What is PMBus protocol?

PMBus defines a set of commands that are specifically targeted for power control and management components to ensure the system is operating correctly. These commands allow the system to perform configuration, control, status monitoring, fault management, and information storage (inventory, user data).

What is PMBus connector?

The Power Management Bus (PMBus) is a variant of the System Management Bus (SMBus) which is targeted at digital management of power supplies. Like SMBus, it is a relatively slow speed two wire communications protocol based on I²C.

What is the difference between SMBus and PMBus?

The PMBus Slave mode allows data rate values of 100 kbps and 400 kbps. The SMBus Slave mode provides options for 10kbps, 50 kbps, 100 kbps, and 400 kbps. The default setting is 100 kbps.

Where is PMBus used?

power-management devices
PMBus is an extension of SMBus, and is a low-cost protocol used for communication between power-management devices. PMBus was created as power supply and semiconductor companies sought to redefine power management within embedded systems, including creating a more efficient way to communicate with their power systems.

Is PMBus same as I2C?

Some practical differences include the fact that with the exception of the Alert Response Address (ARA) call, PMBus will always include a command byte after sending an address, whereas I2C can simply send a slave address and a read bit if it so chooses, and expect the slave to send back some data.

What is the difference between I2C and SMBus?

I2C allows several modes, Standard, Fast and High-Speed. Standard mode allows clock frequencies as high as 100kHz while Fast and High-Speed modes are faster. SMbus allows clock frequencies only as high as 100kHz, so it is not necessary to compare SMBus to any but I2C Standard mode.

What is the difference between SMBus and I2C?

What is SMBus used for?

SMBus, or System Management Bus, is two-wire interface often used for low-speed system management communication between devices on a motherboard. This bus was developed using the foundations of the I2C protocol, so SMBus and I2C hold many similarities and can even inter-operate on the same bus.

Why is SMBus used?

SMBus is used as a means for system component chips, including simple and power-related chips, to communicate between each other within a system. More specifically, it allows for batteries to communicate with other system components, such as the CPU or other power-related components.

Is PMBus compatible with I2C?

PMBus is used in digital management of power supplies with power control and management components. It has commands and structures to support the requirement for power management. This means both I2C primer and PMBus are compatible and interoperable on the electrical requirements and command semantics.

What is the speed of 12c bus?

Data on the I2C-bus can be transferred at rates of up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in Fast-mode Plus, or up to 3.4 Mbit/s in the High-speed mode. The bus capacitance limits the number of interfaces connected to the bus.