MP2884A datasheet(28/107 Pages) MPS

28 / 107 page

MP2884A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2884A Rev. 1.01

www.MonolithicPower.com

12/25/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PMBus Communication Failure

A data transmission fault occurs when the data

is not transferred properly between the devices.

There are several types of data transmission

faults listed below.



Sending too few data



Reading too few data



Master sending too many bytes



The MP2884A reading too many bytes



Improperly set read bit in the address byte



Unsupported command code

The CLEAR_FAULTS (03h) command can be

used to clear the fault record.

PMBus/I2C Transmission Structure

The

MP2884A

supports

five

kinds

transmission structures with or without PEC.

1. Send command only

2. Write byte

3. Write word

4. Read byte

5. Read word

The MP2884A can support the packet error

checking (PEC) mechanism, which can improve

reliability and communication robustness. The

PEC is a CRC-8 error-checking byte calculated

on all the message bytes (including addresses

and read/write bits). The MP2884A only

processes the message if the PEC is correct.

The PEC is calculated in CRC-8 represented by

the polynomial in Equation (14):

    

C x

(14)

Figure 17a shows the supported PMBus/I2C

transmission structure without PEC. Figure 17b

shows the supported PMBus/I2C transmission

structure with PEC.

To read or write registers of the MP2884A, the

PMBus/I2C command must be compliant with

the byte number of the registers in the table of

the register map.

Figure 17a: Supported PMBus/I2C Transmission Structure without PEC

MP2884A Datasheet(PDF) 28 Page - Monolithic Power Systems

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