MP3924 datasheet(44/56 Pages) MPS

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MP3924

– QUAD-PORT IEEE 802.3AF/AT PSE CONTROLLER

MP3924 Rev. 1.0

MonolithicPower.com

7/16/2021

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

D[3]

2EVNTC4

Indicates whether two-event classification has been completed on port 4. This bit is

set to 1 if two-event classification has been completed. This bit is only set once

Class 4 and Class 5 are successfully detected.

D[2:0]

DETR4

000

Indicates port 4’s detection result.

000: Detection has not completed (default after a power-on reset)

001: The port is shorted (VIN - OUT < 1.5V)

010: CDET too high (exceeds 5µF)

011: RDET is too low (below

19kΩ)

100: Detection is valid (19kΩ < RDET < 26.5kΩ)

101: RDET

is too high (exceeds 26.5kΩ)

110: The port is open (<15µA load current)

111: Low impedance to PGND (OUT - PGND < 2V)

POWER_STATUS (2Ah)

Read-only

Bits

Bit Name

Default Value

Description

D[7]

PG4

Indicates the power good (PG) status for all ports. This bit is set to 1 if the

corresponding port’s power is on, and if the OUTx pin’s voltage is below VPG.

The PG bit resets once the OUTx pin

’s voltage exceeds the VPG threshold with a

short deglitch time.

D[6]

PG3

D[5]

PG2

D[4]

PG1

D[3]

PEN4

Indicates whether power has been enabled on a port. These bits are set to 1 if the

corresponding port is powered on.

D[2]

PEN3

D[1]

PEN2

D[0]

PEN1

POWER_STATUS_CHANGE (2Bh and 2Ch)

(2Bh) Read-only

(2Ch) Read and clear

Bits

Bit Name

Default Value

Description

D[7]

PGC4

Indicates whether the power good (PG) status has changed on the ports. This bit is

set to 1 if the PG status changes on the corresponding port.

D[6]

PGC3

D[5]

PGC2

D[4]

PGC1

D[3]

PEC4

Indicates whether the power status has been enabled or disabled on the ports.

This bit is set 1 if the power status changes (disabled or enabled) on the

corresponding port.

D[2]

PEC3

D[1]

PEC2

D[0]

PEC1

OVER_LOAD_STATUS (2Dh and 2Eh)

(2Dh) Read-only

(2Eh) Read and clear

Bits

Bit Name

Default Value

Description

D[7]

OCUT4

Indicates whether the ICUT1~4 timer (tICUT) has finished counting after ICUTx

exceeds the over-current (OC) threshold. This bit is set to 1 if tICUT times out.

D[6]

OCUT3

D[5]

OCUT2

D[4]

OCUT1

D[3]

STF4

Indicates a start-up failure for all ports. This bit is set to 1 if start-up inrush timer

times out, or if there is a power-on command failure.

D[2]

STF3

D[1]

STF2

D[0]

STF1

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