TME7628S

TME7628S is an 8-port PSE (Power Sourcing Equipment) controller IC for PoE (Power over Ethernet) systems. It integrates power, analog and logic circuits into a single chip, and can be used for Midspans and Endpoint PSE applications. TME7628S meets all IEEE 802.3AF-2003 requirements, such as multi-point resistor detection, PD classification, DC Disconnect, and Back-off for Midspans. It also meets all IEEE 802.3AT-2009 requirements, such as two-event classification and supply maximum 36W per port. The device also supports for detection and classification of high-power PDs. The device supports single-supply operation, provides up to 60W to each port (Class4+ enabled) and 90W to two port(4 pair enabled). TME7628S comprises internal temperature monitoring and thermal protection to protect against junction overheating. TME7628S has a maximum power setting pin. Connect a resistor from this pin to GND to set the total power capability on all 8 output ports. TME7628S will limit the total power on 8 ports below this power limit. The 3.3V regulator is built-in to support external devices. Multiple TME7628Ss can integrate to build an 8 x N ports PSE system, and I2C bus uses to collect PD power status from each TME7628S to support global power managements. Management switch host has options to communicate TME7628S via I2C bus for PSE management activities. Optocouplers can be implemented to provide electrical isolations between the host and TME7628S for signal communication.