MP3924 datasheet(4/56 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.

PIN FUNCTIONS

Pin #

Name

Description

GATE1

MOSFET gate driver for port 1. Float the GATE1 pin if not used.

OUT1

Output voltage sense pin for port 1. Connect OUT1 to the output interface return for

detecting, classifying, voltage sensing, and current limit foldback control. Float the OUT1

pin if not used.

INT2

High-priority interrupt request pin. INT2 pulls low when the selected high-priority

interrupt source register is set and the interrupt is enabled. INT2 is an open-drain output.

Connect INT2 to DGND if the interrupt function is not used.

SGND1

Current sense negative input for port 1 and port 2. Connect SGND1 to the low-side

terminal of the sense resistor. For an accurate current sense, use a Kelvin connection

when connecting SGND1 to the PCB. Connect SGND1 to DGND if not used.

CLS5

Class 5 enable input. CLS5 is internally pulled down to DGND through a

50kΩ resistor.

Leave CLS5 disconnected to disable the classification for Class 5 devices (IEEE 802.3at-

compliant mode). Connect CLS5 to VCC to enable the classification of Class 5 devices.

CLS5

’s status is latched when the device starts up, or after a reset condition. If CLS5’s

status changes after start-up, there is no effect.

AUTO

Automatic mode setting pin. AUTO is internally pulled up to VCC through a

50kΩ resistor

(an external 10k

Ω resistor can be added). Float the AUTO pin to make automatic mode the

default. Connect the AUTO pin to DGND to make shutdown mode the default.

AUTO’s

status is latched when the device starts up, or after a reset condition. If AUTO

’s status

changes after start-up, there is no effect.

MID

Midspan mode setting. MID is internally pulled up to VCC through a 50k

Ω resistor (an

external 10kΩ resistor can be added). Float the MID pin for midspan mode, then wait 2.8s

to reinitiate detection. Connect the MID pin to DGND to disable midspan mode. MID

’s

status is latched when the device starts up, or after a reset condition. If MID

’s status

changes after start-up, there is no effect.

INT1

Interrupt request pin for all interrupt source events. INT1 pulls low when the interrupt

INT1 to DGND if the interrupt function is not used.

SCL

I2C clock input pin. Connect SCL to VCC using an external pull-up resistor (typically

4.7k

Ω). Connect SCL to VCC if the I2C interface is not used.

SDAO

I2C serial data output pin. SDAO is an open-drain output. Connect SDAO to VCC using

an external pull-up resistor (typically 4.7k

Ω). Connect SDAO to SDAI for non-isolated

applications. Connect SDAO to DGND if the I2C interface is not used.

SDAI

I2C serial data input pin. Connect SDAI to VCC using an external pull-up resistor

(typically 4.7k

Ω). Connect SDAI to SDAO for non-isolated applications. Connect SDAI to

DGND if the I2C interface is not used.

Enable input. EN turns all internal circuits and four ports (except the VCC regulator) on

and off. To turn on the device automatically, externally connect EN to VCC.

MP3924 address setting pin. Connect A0 to VCC or DGND to set the lower 4-bit address

bits (address = 010 A3 A2 A1 A0). The address signal is latched when the device starts up

or is reset. A0 is internally pulled up to VCC through a 50k

Ω resistor (an external 10kΩ

resistor can also be added).

MP3924 address setting pin. Connect A1 to VCC or DGND to set the lower 4-bit address

bits (Address = 010 A3 A2 A1 A0). The address signal is latched when the device starts up

or is reset A1 is internally pulled up to VCC through a 50k

Ω resistor (an external 10kΩ

resistor can also be added).

MP3924 Datasheet(PDF) 4 Page - Monolithic Power Systems

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