MIC2358 Datasheet, PDF (4/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

Micrel, Inc.
MIC2358YLQ
Pin Description
Pin Number
1
2
3
Pin Name
P1OUTPOS
P1OUTNEG
P1GATE
4
P1SENSE
5
P2OUTPOS
6
P2OUTNEG
7
P2GATE
8
P2SENSE
9
P3OUTPOS
10
P3OUTNEG
11
P3GATE
12
P3SENSE
13
P4OUTPOS
14
P4OUTNEG
15
P4GATE
16
P4SENSE
17
NC
18
ENABLE_L
19
ALTB
20
ICO
21
ACMPS
22
DCMPS
23
5VS
24
NC
25
DRTN
26
48VS
27
DRTN
28
ARTN
29
ARTN
Pin Function
Port 1 Positive 48V Terminal Input.
Port 1 Negative 48V Terminal Input.
Port 1 Gate Drive Output: Connect this pin to the gate terminal of Port 1’s external power
FET.
Port 1 Sense Input: Connect this pin the source terminal of Port 1’s external power FET.
Port 2 Positive 48V Terminal Input.
Port 2 Negative 48V Terminal Input.
Port 2 Gate Drive Output: Connect this pin to the gate terminal of Port 2’s external power
FET.
Port 2 Sense Input: Connect this pin the source terminal of Port 2’s external power FET.
Port 3 Positive 48V Terminal Input.
Port 3 Negative 48V Terminal Input.
Port 3 Gate Drive Output: Connect this pin to the gate terminal of Port 3’s external power
FET.
Port 3 Sense Input: Connect this pin the source terminal of Port 3’s external power FET.
Port 4 Positive 48V Terminal Input.
Port 4 Negative 48V Terminal Input.
Port 4 Gate Drive Output: Connect this pin to the gate terminal of Port 4’s external power
FET.
Port 4 Sense Input: Connect this pin the source terminal of Port 4’s external power FET.
No connection.
Autonomous mode select pin Input. When high, all ports are disabled on power up and can
only be enabled via SMBus interaction. When low, all ports are enabled on power up and
device operation will proceed without SMBus interaction necessary. Internally pulled up to
+5V by a 50kΩ resistor.
Autonomous mode select pin Input. When high all ports will be configured for Alt B operation,
when low all ports will be configured for Alt A operation. Internally pulled up to +5V by a 50kΩ
resistor.
Autonomous mode select pin Input. When high, ports will not have power removed if its
current exceeds the class-dependent overload current, i.e. overload current will be equal to
Class 0 Level. Internally pulled up to +5V by a 50kΩ resistor.
Autonomous mode select pin Input. When high, AC Maintain Power Signature feature is
enabled. Internally pulled up to +5V by a 50kΩ resistor.
Autonomous mode select pin Input. When high, DC Maintain Power Signature feature is
enabled. Internally pulled up to +5V by a 50kΩ resistor.
+5V Supply Voltage: Applying a +5V supply relative to 48VRTN powers the MIC2358YLQ’s
internal digital circuits, state machines, and port control circuits.
No connection.
Digital Ground Return.
48V Power Supply Input: In a negative common application, applying a conditioned +48V
supply (+44V ≤ 48VS ≤ +60V) provides the supply voltage to power the MIC2358YLQ and all
eight ports. In a positive common application, apply system COM to this pin.
Digital Ground Return.
Analog Ground Return.
Analog Ground Return.
July 2010
4
M9999-070810