MP3924 datasheet(35/56 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.

“A” is “1” if the AUTO pin is set high during start-up or a reset. “A” is “0” if the AUTO pin is set low. In

automatic and semi-automatic mode, the detection and classification processes are enabled when the

bit is set to 1. In manual made, set the bit to 1 for one-time detection or classification. Then the bit is

reset to 0.

DISCONNECT_ENABLE (07h)

Read/write

Bits

Bit Name

Default Value

Description

D[7:4]

RESERVED

Reserved.

D[3]

DISEN4

Enables DC load disconnection for ports 1 through 4.

“A” is 1 if the AUTO pin is

set high during start-

up or a reset. “A” is 0 if the AUTO pin is set low. If these bits

are set to 1, the DC load disconnection function is enabled on the corresponding

port.

D[2]

DISEN3

D[1]

DISEN2

D[0]

DISEN1

FAULT_TIMER (08h)

Read/write

Bits

Bit Name

Default Value

Description

D[7:6]

TPMAX

Sets the total power overload timer after start-up.

00: 15ms

01: 30ms

10: 60ms

11: 120ms

D[5:4]

TINRUSH

Sets the start-up inrush current timer for all ports.

00: 15ms

01: 30ms

10: 60ms

11: 120ms

D[3:2]

TILIM

Sets the current limit trigger timer after start-up for all ports.

00: 7.5ms

01: 15ms

10: 30ms

11: 60ms

D[1:0]

TCUT

Set the over-current (OC) timer after start-up for all ports.

00: 15ms

01: 30ms

10: 60ms

11: 120ms

The timer begins counting up after a load triggers the threshold. If the current drops below the

threshold, the timer begins counting down at 1/16 of the rising rate. If it times out, the port shuts down.

The port cannot be redetected once the timer counts down to 0.

FOLDBACK_ILIM (0Bh)

Read/write

Bits

Bit Name

Default Value

Description

D[7:1]

RESERVED

Reserved.

D[0]

FBLIMT

Sets the foldback over-current (OC) threshold when the OUTx pin exceeds 46V.

0: The foldback current limit is 22mV (88mA if RSENSE

= 0.25Ω).

1: The foldback current limit is 40mV (160mA RSENSE

= 0.25Ω).

MP3924 Datasheet(PDF) 35 Page - Monolithic Power Systems

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