MIC2358 Datasheet, PDF (1/29 Pages) Micrel Semiconductor – IEEE 802.3af Octal Power Sourcing Equipment Controller

MIC2358YLQ
IEEE 802.3af Octal Power Sourcing
Equipment Controller
General Description
The MIC2358YLQYLQ octal network power controller is
designed for use in IEEE 802.3af-compliant power-
sourcing equipment (PSE). The device provides
standardized powered devices (PD) detection,
classification, current-limit, and monitoring of both DC
and AC maintain power signatures.
The MIC2358YLQYLQ can operate autonomously or be
controlled by software through a SMBus-compatible
interface. Its five address inputs support 32 unique
MIC2358YLQ addresses allowing control and monitoring
up to 256 powered Ethernet ports (32 MIC2358YLQ
devices) by an external management application.
For each port, the MIC2358YLQ uses external N-
Channel power FETs and current sense resistors to
deliver and monitor power. State machines have been
incorporated into this device for complete configuration,
fault reporting, and status on a per-port basis, including
port voltage and current.
The MIC2358YLQ also implements Micrel’s shared
power management and port prioritization which offers
more flexible allocation of available power among the
ports.
Throughout this document the term 802.3af is
synonymous for IEEE Std 802.3-2005.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Fully compliant with the IEEE 802.3af Power-over-
Ethernet standard
• Controls eight independent 48V-powered Ethernet
ports
• Powered port attributes:
– Up to 15.4W delivered per port
– Input over-voltage protection (OVP)
– Powered Device detection and classification
– Active current limit
– Powered Device AC and DC disconnect
supported
• Operates autonomously or by SMBus control
• 5-bit programmable digital addressing allows control
of up to 256 Ethernet powered ports
• Hardware fault interrupt output
• Available in a Pb-free 64-pin LQFP package
Applications
• IEEE 802.3af Compliant Enterprise Switches/Hubs
• IEEE 802.3af Compliant Endpoint and Midspan
Power Sources
• PSE Power Injectors
• IP Phone Systems
• DTE Power Distribution
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Ordering Information
Part Number
MIC2358YLQYLQ
Temperature Range
0 °C to +70 °C
Pb-Free Package
64-Pin LQFP
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2010
M9999-070810