Copyright © 2013 Microsemi
Rev. 1.7, 17-July-2013 Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656, USA; Phone (USA): (800) 713-4113, (ROW): (949) 221-7100 Fax: (949) 756-0308
1 Port PSE PoE PD69101 Controller
Logic Main Control Module
The Logic Main Control Block includes the Digital
Timing Mechanisms and State Machines,
synchronizing and activating the PoE functions such
as:
Real Time Protection (RTP)
Start Up Macro (DVDT)
Load Signature Detection (RES DET)
Classification Macro (CLASS)
Voltage and Current Monitoring Registers
(VMC)
LEDs Stream Out Control Indications
ADC Interfacing
Direct Digital Signals with Analog Block
Line Detection Generator
Upon request from the Main Control Module, four
different voltage levels are generated by the Line
Detection Generator, ensuring robust AF / AT Line
Detection functionality.
Classification Generator
Upon request from the Main Control Module, the State
Machine applies a regulated Class Event and Mark
Event voltages to the ports, as required by the IEEE
standard.
Current Limiter
This circuit continuously monitors the current of
powered ports and limits the current to a specific value,
according to pre-defined limits as set by AF/AT and
Current_Set pins. In cases where the current exceeds
this specific level, the system starts measuring the
elapsed time. If this time period is greater than a
preset threshold, the port is disconnected.
Main MOSFET
Main power switching FET, used to control PoE current
into the load.
ADC
A 10-Bit Analog to Digital converter, used to convert
analog signals into digital registers for the Logic Control
module.
Power on Reset (POR)
This circuit monitors the internal 3.3 V voltage DC
levels. If this voltage drops below specific thresholds, a
reset signal is generated and the PD69101s are reset.
Voltage Regulator
The voltage regulator generates 3.3 VDC and 5 VDC
for the internal circuitry. These voltages are derived
from the Vmain supply.
CLK
CLK is an internal 8 MHz clock oscillator.
