MIC2358 Datasheet, PDF (5/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

Micrel, Inc.
MIC2358YLQ
Pin Number
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Pin Name
SPMREF
SPMBUS
RDET
P5SENSE
P5GATE
P5OUTNEG
P5OUTPOS
P6SENSE
P6GATE
P6OUTNEG
P6OUTPOS
P7SENSE
P7GATE
P7OUTNEG
P7OUTPOS
P8SENSE
P8GATE
P8OUTNEG
P8OUTPOS
/RESET
NC
DRTN
ACDRIVE
ACSENSE
SCL
SDAOUT
SDAIN
DRTN
/SMBINT
/CS
ADDR5
ADDR4
ADDR3
ADDR2
Pin Function
Shared Power Management Reference Resistor. Connect an external 250kΩ, 1% resistor
from this pin-to-ARTN.
Shared Power Management Buss. A resistor connected from this pin to ARTN sets the total
power allocated to all ports in use. For all eight ports, the total maximum allocated power is
123.2W (15.4W x 8 ports). The transfer characteristic for this pin is 2.5V/RSPMREF per Watt.
Thus, the resistor value is determined by RSPMREF/PTOTAL.
PD Signature Detection Resistor. Connect a 1kΩ 1% resistor from this pin to ARTN.
Port 5 Sense Input: Connect this pin the source terminal of Port 5’s external power FET.
Port 5 Gate Drive Output: Connect this pin to the gate terminal of Port 5’s external power
FET.
Port 5 Negative 48V Terminal Input.
Port 5 Positive 48V Terminal Input.
Port 6 Sense Input: Connect this pin the source terminal of Port 6’s external power FET.
Port 6 Gate Drive Output: Connect this pin to the gate terminal of Port 6’s external power
FET.
Port 6 Negative 48V Terminal Input.
Port 6 Positive 48V Terminal Input.
Port 7 Sense Input: Connect this pin the source terminal of Port 7’s external power FET.
Port 7 Gate Drive Output: Connect this pin to the gate terminal of Port 7’s external power
FET.
Port 7 Negative 48V Terminal Input.
Port 7 Positive 48V Terminal Input.
Port 8 Sense Input: Connect this pin the source terminal of Port 8’s external power FET.
Port 8 Gate Drive Output: Connect this pin to the gate terminal of Port 8’s external power
FET.
Port 8 Negative 48V Terminal Input.
Port 8 Positive 48V Terminal Input.
Reset Input: This active LOW asserted digital input is used to reset the MIC2358YLQ to
default settings. There is an internal 50kΩ resistor connected from this pin to 5VS.
Do not connect.
Digital Ground. Connect this pin to all other MIC2358YLQ DRTN pins at one point.
Internal AC Oscillator output. Accessible from this pin is the MIC2358YLQ’s internal oscillation
specifically required to support AC Disconnect. An 83Hz square wave with 50% is available.
Senses the AC Drive forced on positive port terminals. Connect to V48 through 800Ω and
diode even if AC disconnect is not used. Please see reference schematic.
SMBus Serial Clock Input. External pull up resistor required.
SMBus Serial Data Output.
SMBus Serial Data Input. External pull up resistor required.
Digital Ground. Connect this pin to all other MIC2358YLQ DRTN pins at one point.
SMBus Interrupt open-drain output. External pull up resistor required.
Address Chip Select Input. This bit is internally pulled up to +5V by a 50kΩ resistor.
SMBus Address Bit 5 (MSB): This address bit is the most significant bit of the MIC2358YLQ’s
5-bit address bank. This bit is internally pulled up to +5V by a 50kΩ resistor.
SMBus Address Bit 4: This bit is internally pulled up to +5V by a 50kΩ resistor.
SMBus Address Bit 3: This bit is internally pulled up to +5V by a 50kΩ resistor.
SMBus Address Bit 2: This bit is internally pulled up to +5V by a 50kΩ resistor.
July 2010
5
M9999-070810