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Si3452B-B01-GM 数据表(PDF) 2 Page - Silicon Laboratories |
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Si3452B-B01-GM 数据表(HTML) 2 Page - Silicon Laboratories |
2 / 36 page Si3452/3 2 Rev. 1.0 Description When connected directly to the host system or configured in Auto mode, each Si3452/3 high-voltage port controller provides all of the critical circuitry and sophisticated power measurement functionality for the high-voltage interfaces of four complete PSE ports. The Si3452/3 fully integrates robust, low-RON (0.3 typical) power MOSFET switches, low-power dissipation current sensing circuitry, and transient voltage surge suppression devices. The on-chip current sense circuitry and power MOSFETs provide programmable scaling of current limits to match either PoE (350 mA, 15.4 W), PoE+ (600 mA, 30 W), and extended (800 mA, 40 W) power requirements on a per- port basis. Designed for use in Endpoint PSE (e.g., Ethernet switches) or Midspan PSE (e.g., inline power injectors) applications, each Si3452/3 also performs the IEEE-required powered device (PD) detection, classification, and disconnect functionality. The flexible architecture enables powered device disconnect detection using either dc disconnect (Si3453) or Silicon Laboratories' proprietary dV/dt disconnect (Si3452) sensing algorithm. dV/dt disconnect is an alternative to dc disconnect that requires no additional BOM components, does not dissipate extra device power, and fully interoperates with all powered devices. Also provided are multi-point detection algorithms and per-port current and voltage monitoring. Intelligent protection circuitry includes power supply under-voltage lockout (UVLO), port output current limiting and short-circuit protection, thermal overload sensing and port shutdown, and transient voltage surge-suppressors capable of protecting the Si3452/3 from a variety of harsh surge events seen on the RJ-45 interface. To maximize system design flexibility and minimize cost, each Si3452/3 connects directly to a system host controller through an I2C serial interface, eliminating the need for an external MCU. The Si3452/3 can be set to one of 12 unique addresses, allowing control of up to 48 ports on a single I2C bus. Functional Block Diagram PER PORT ANALOG HV SPI & Port Control VOUT1 Gate Control, Current Limit & Foldback Detection & Classification DC or dV/dt Disconnect Channel Mode & Limit Control VREF & Central Bias PGA DET4 VOUT2 VOUT3 DET3 DET2 Thermal Prot. DET1 VOUT4 Current Sense 10b ADC Temp Sensor LV SPI MCU Core & PSE FSM 256 Byte SRAM 8 kByte EPROM I2C PLL Voltage Regulator & Monitor POR WDT |
类似零件编号 - Si3452B-B01-GM |
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类似说明 - Si3452B-B01-GM |
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