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MP3924 Datasheet(PDF) 39 Page - Monolithic Power Systems

Part # MP3924
Description  Quad-Port, IEEE 802.3af/at PSE Controller for Power over Ethernet
PDF  56 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP3924 Datasheet(HTML) 39 Page - Monolithic Power Systems

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MP3924
– QUAD-PORT IEEE 802.3AF/AT PSE CONTROLLER
MP3924 Rev. 1.0
MonolithicPower.com
39
7/16/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
ICUT4_THRESHOLD (16h)
Read/write
Bits
Bit Name
Default Value
Description
D[7:3]
RESERVED
-
Reserved.
D[2:0]
ICUT4
000
Sets port
4’s over-current (OC) threshold. The default value is 000. In automatic
mode, the bits are set to 000 for Class 0~3 results, 100 for Class 4 results, and
101 for Class 5 results. In semi-automatic mode or manual mode, the bits do not
change unless changes are made via the I2C.
000 = 93.75mV (375mA with RSENSE
= 0.25Ω)
001 = 27.5mV (110mA with RSENSE
= 0.25Ω)
010 = 47mV (188mA with RSENSE
= 0.25Ω)
011 = 93.75mV (375mA with RSENSE
= 0.25Ω)
100 = 162.5mV (650mA with RSENSE
= 0.25Ω)
101 = 230mV (920mA with RSENSE
= 0.25Ω)
110 = 125mV (500mA with RSENSE
= 0.25Ω)
111 = 156.25mV (625mA with RSENSE
= 0.25Ω)
ILIM1_THRESHOLD (17h)
Read/write
Bits
Bit Name
Default Value
Description
D[7:1]
RESERVED
-
Reserved.
D[0]
ILIM1
0
Sets port 1
’s over-current (OC) limit. The default value is 0. In automatic mode, the
bits are set to 0 for Class 0~3, and set to 1 for Class 4 or Class 5 results. In semi-
automatic mode and manual mode, the bits do not change unless changes are
made via the I2C.
0: 106.25mV (425mA if RSENSE
= 0.25Ω)
1: 212.5mV. The current limit is 265mV under Class 5 conditions
ILIM2_THRESHOLD (18h)
Read/write
Bits
Bit Name
Default Value
Description
D[7:1]
RESERVED
-
Reserved.
D[0]
ILIM2
0
Sets port
2’s over-current (OC) limit. The default value is 0. In automatic mode, the
bits are set to 0 for Class 0~3, and set to 1 for Class 4 or Class 5 results. In semi-
automatic mode and manual mode, the bits do not change unless changes are
made via the I2C.
0: 106.25mV (425mA if RSENSE
= 0.25Ω)
1: 212.5mV. The current limit is 265mV under Class 5 conditions
ILIM3_THRESHOLD (19h)
Read/write
Bits
Bit Name
Default Value
Description
D[7:1]
RESERVED
-
Reserved.
D[0]
ILIM3
0
Sets port
3’s over-current (OC) limit. The default value is 0. In automatic mode, the
bits are set to 0 for Class 0~3, and set to 1 for Class 4 or Class 5 results. In semi-
automatic mode and manual mode, the bits do not change unless changes are
made via the I2C.
0: 106.25mV (425mA if RSENSE
= 0.25Ω)
1: 212.5mV. The current limit is 265mV under Class 5 conditions



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