MP2884A datasheet(63/107 Pages) MPS

63 / 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.

READ_CS9_10 (77h)

This register is the phase-current ADC value of phase 9 and phase 10. An internal low-pass filter is

used before ADC.

Command

READ_CS9_10

Format

Unsigned binary

Bit

Access

Function

Bits

Bit Name

Description

15:8

RESERVED

Unused. X indicates that writes are ignored and reads are always 0.

7:0

RESERVED

Unused. X indicates that writes are ignored and reads are always 0.

Calculate the per-phase current sense with Equation (22):

CSn = 256 x (ICS x Kcs x Rcs/1000 + 1.23) / 3.2

(22)

Where RCS is the phase current sense resistor (in kΩ), and KCS is the current sense gain of the DrMOS

(in µA/A).

If PHASE_CURRENT_RESOLUTION = 1 in register 44h, the CS report should be doubled.

STATUS_BYTE (78h)

This register returns one byte of information for critical faults.

Command

STATUS_BYTE

Format

Unsigned binary

Bit

Access

r/w

Function

Bits

Bit Name

Description

RESERVED

Unused. X indicates that writes are ignored and reads are always 0.

OFF

This bit is asserted if the unit is not providing power to the output. This bit is in

live mode.

VOUT_OV_FAULT

Once output OVP occurs, this bit is set. This bit is in latch mode. The

CLEAR_FAULTS command can reset this bit.

IOUT_OC_FAULT

Once output OCP occurs, this bit is set. This bit is in latch mode. The

CLEAR_FAULTS command can reset this bit.

VIN_UV_FAULT

Once input UVP occurs, this bit is set. This bit is in latch mode. The

CLEAR_FAULTS command can reset this bit.

TEMPERATURE

Once OTP or a warning occur, this bit is set. This bit is in latch mode. The

CLEAR_FAULTS command can reset this bit.

CML

Once a communications, memory, or logic fault occurs, this bit is set. This bit is

in latch mode. The CLEAR_FAULTS command can reset this bit.

RESERVED

Unused. X indicates that writes are ignored and reads are always 0.

MP2884A Datasheet(PDF) 63 Page - Monolithic Power Systems

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