MIC2358_11 Datasheet, PDF (20/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

Micrel, Inc.
Port Control Register
SMBus Address: 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38
Read and Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
–
–
–
dc_mps
ac_mps
Bit 2
classify
MIC2358YLQ
Bit 1
force_power
Bit 0
disable
Name
Default
Description
dc_mps
Note 1
Enables DC maintain power signature detection.
ac_mps
Note 2
Enables AC maintain power signature detection.
classify
1
Enables classification.
force_power
0
Puts the port into the TEST_MODE state.
disable
Note 3
Puts the port into the DISABLE state.
Notes:
1. Initial state determined by DCMPS input pin
2. Initial state determined by ACMPS input pin
3. Initial state determined by ENABLE input pin. If cleared, puts the port into the IDLE state.
Port Option Register
SMBus Address: 0x01, 0x09, 0x11, 0x19, 0x21, 0x29, 0x31, 0x39
Read and Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
classify_
and_deny
max_class
monitor
Bit 2
event_hold
Bit 1
priority
Bit 0
Name
classify_and_deny
max_class
monitor
event_hold
priority
Default
0 (Note 1)
0
0
0
Low
Description
The port will be detected and classified, but power will be denied (i.e,. put into
POWER_DENIED state).
Maximum class allowed for new power to be supplied to a detected PD.
Enables readback of the port voltage and current.
Prevents the port from starting a new detection cycle when an unmasked
event is stored in the event register.
Port priority level for power management. Possible settings are shown below.
This setting is used in conjunction with the minimum_priority_new-power and
minimum_priority_maintain_power settings in the global POWER_SETUP
register.
Port Priority Levels
Name
critical
high
medium
low
Value
11
10
01
00
Note:
1. Bit classify must be enabled in Control register
July 2010
20
M9999-070810