PD64012 Datasheet, PDF (9/16 Pages) List of Unclassifed Manufacturers – 12-channel PoE Manager

PD64012
12-CHANNEL PoE MANAGER
M ISO
SPI
MOSI
SS
SCK
SCL
I²C
SDA
C om m unication
I/O
SPI
Com
Interface
I²C
PoL
Sequencer
Power Management
O verload /
D isconnect
R eco very
AC D isconnect
M a cro
Channel RT
Control Status
O verload
L o g ic
D C D isconnect
L o g ic
DDigigitiatal _l
C lassification
Resistor Line
D etection
V p o rt
M easurem ent
Current and AC
V o lta g e
Measurem ent
I_lim R e g
I_class R eg
+ 48V
VM AIN
C lock
O scillator
AC DAC
8 -b it
LD DAC
Reset
POR
Vm ain
48+5v
Pum p
Up
V o lta g e
R e g u la to r
AC D isconnect G enerator
x12
Line D etection
x12
Vport
1 0 -b it
ADC
R eal Tim e
P ro te c tio n
8 -b it
ADC
DC D isconnect
Com parator
I_lim 8-b it D AC
I_class 8-b it D AC
Vport Level Shifter
C lassification
Vm ain -17 V
C urrent Lim iting
x12
AAnnaalologg
VPORTPOS
VPORTNEG
PORTSENSE
Sense
R esistor
Figure 5: Internal Block Diagram
Digital Section
Communication I/O
The PD64012 incorporates two communication interfaces. When operating in the Enhanced mode, an SPI bus
connects the PD63000 MCU to the PD64012s. The second interface is the I²C, used in the Automatic mode (with
the host).
Both interfaces are used to communicate the contents of internal registers between the PD64012 logic and the
MCU.
PoE Sequencer
This central block of the Digital section includes a combination of internal state machines (macros). It is fed from
the Overload/Disconnect Recovery circuit and from the Power Management block.
Power Management
Receives data from the Vport Measurement block and receives commands and controls from the Communication
Interface. This, in order to control the power allocated to the system, as defined by the host. Power Management
receives requests to enable ports and decides, by communicating with the Sequencer, whether power is to be
allocated.
Overload /Disconnect Recovery
There is a number of macros which decide on port enable and some on port disconnect.
Port enabling: Classification, Resistor Line Detection and Vport Measurement.
Port disable: AC Disconnect, DC Disconnect and Overload Logic. These macros are connected to the Channel RT
Control Status block. Based on the inputs from these macros, the Channel RT controller starts the shutdown
operation or the recovery process. This is done according to preprogrammed parameters for different time
windows, as shown in Figure 2, Power Limits.
www.powerdsine.com
9
06-0003-058 (Rev. 2.8) / 5 August 2004
© PowerDsine 2003
Information in this document subject
to change without prior notice.