MP3924GU datasheet(43/56 Pages) MPS

43 / 56 page

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[2:0]

DETR2

000

Indicates

port 2’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)

DET/CLS_RESULT3 (28h)

Read-only

Bits

Bit Name

Default Value

Description

D[7:4]

CLSR3

0000

Returns the classification result for port 3.

0000: Classification is not done

0001: Class 1

0010: Class 2

0011: Class 3

0100: Class 4

0101: Class 5

0110: Class 0

0111: Over-current (OC) condition

1000: The first and secondary class results do not match

If Class 5 is enabled, any current that exceeds Class

4’s upper limit is considered a

Class 5 result. An OC condition triggers a current limit. If Class 5 is disabled, any

current exceeding Class

4’s upper limit is considered an OC condition.

D[3]

2EVNTC3

Indicates whether two-event classification has been completed on port 3. 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]

DETR3

000

Indicates port 3’s detection result.