MP3924 datasheet(42/56 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.

DET/CLS_RESULT1 (26h)

Read-only

Bits

Bit Name

Default Value

Description

D[7:4]

CLSR1

0000

Returns the classification result for port 1.

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]

2EVNTC1

Indicates whether two-event classification has been completed on port 1. 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]

DETR1

000

Indicates port 1’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 (19k

Ω < RDET < 26.5kΩ)

101: RDET is too high (exceeds 26.5k

Ω)

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

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

DET/CLS_RESULT2 (27h)

Read-only

Bits

Bit Name

Default Value

Description

D[7:4]

CLSR2

0000

Returns the classification result for port 2.

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]

2EVNTC2

Indicates whether two-event classification has been completed on port 2. 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.

MP3924 Datasheet(PDF) 42 Page - Monolithic Power Systems

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