MIC2358YLQ Datasheet, PDF (21/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

Micrel, Inc.
MIC2358YLQ
Port Voltage Register
SMBus Address: 0x04, 0x0C, 0x14, 0x1C, 0x24, 0x2C, 0x34, 0x3C
Read Only
The Voltage register holds the 8-bit value of the measured port voltage. The LSB is equivalent to 0.25V. The register is
only valid if the monitor bit of the port option register is set; otherwise it reads as 0x00.
Port Current Register
SMBus Address: 0x05, 0x0D, 0x15, 0x1D, 0x25, 0x2D, 0x35, 0x3D
Read Only
The Current register holds the 8-bit value of the measured port current. The LSB is equivalent to 2mA. The register is
only valid if the monitor bit of the port OPTION register is set; otherwise it reads as 0x00.
Port Status Register
SMBus Address: 0x06, 0x0E, 0x16, 0x1E, 0x26, 0x2E, 0x36, 0x3E
Read Only
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
–
pse_status
Bit 2
pd_class
Bit 1
Bit 0
Name
pse_status
pd_class
Description
Indicates the port PSE Status bits from the Table 33-16 of
IEEE Std 802.3af. Possible values are shown below
Indicates the class of a detected PD. Possible values are shown below. (Note 1)
PSE Status
Status
Disabled
Searching
Delivering Power
Test mode
Test error
Implementation specific fault
Reserved
Reserved
Value
000
001
010
011
100
101
110
111
PD Class
Class
Value
Class 0
000
Class 1
001
Class 2
010
Class 3
011
Class 4
100
Note:
1. Per IEEE Std 802.3af, PD class defaults to 0 if classification is disabled.
July 2010
21
M9999-070810