Overview: PoE PSE Power Management Controller
PD77020 Introduction
The PD77020 PoE Power Management Controller provides multi-port PoE functions, such as, port mapping (Port Matrix), port priority, port status, and system power management. The PD77020 device can be used in conjunction with PD77728 seventh generation PoE Manager/Controller from Microchip. The PD77020 device is based on a Microchip SAMD21 controller and is packaged in a 5 mm × 5 mm 32-pin QFN package.
The following figure shows a typical PoE application with PD77020.
Figure 1. Typical PoE Application with PD77020 HOST_GND HOST_3.3V HOST_GND HOST_3.3V ISO_3.3V
Host Processor SDA
SCL VDD
PD77020 I2C_IN_SDA I2C_IN_SCL I2C_OUT_SDA I2C_OUT_SCL CONTROL 5 GND 4 HOST_GND CONTROL xRESET_OUT OSS_OUT LED_CONTROL PGx VSSD HOST_GND Isolation Barrier I2C
Isolation Isolation POE_3.3V POE_3.3V VMAIN Up to 12 Devices VDD VDDA VMAIN SDIO SCLIO PORT_NEG0
PD77728
PoE Manager/Controller RESET_IN_N OSS PORT_NEG7 VMAIN VMAIN IREF AGND DGND POE_DGND POE_AGND Data Sheet
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