Designing 1-port PoE System Using PD69101
Application Note 184
Introduction _______________
This application note provides detailed information
and circuitry design guidelines for the implementation
of an single port Power over Ethernet (PoE) system,
based on Microsemi’s™ 1-port PSE PoE controller,
the PD69101. This system operates as a standalone
system.
This document enables the designer to integrate PoE
capabilities, as defined by IEEE standard
802.3af-2003, into an Ethernet switch or a router.
A PD69101 based design is intended for low cost
applications where PoE implementation is required
but there is no need for more sophisticated features
such as power management.
For easier design and development of an Ethernet
Switch using the PD69101, an evaluation board (P/N
PD-IM-7401) can be ordered.
IEEE 802.3af-2003 standard, DTE
Power via MDI
IEEE802.3at-2009 standard, DTE
Power via MDI
PD69101 Data Sheet, Catalogue
Number 06-0076-058
PD-IM-7401 Evaluation Board User
Guide Catalogue Number
06-0471-056
Background _______________
This application note defines the stand-alone
operation for a 1-port system. In this configuration,
the PD69101 operates without any communication to
the host.
The PD69101 PSE PoE controller implements real
time functions according to IEEE 802.3af-2003
including detection, classification and port-status
monitoring. The PoE controller is designed to detect
and disable disconnected PDs (Powered Devices),
using the DC disconnection method, as defined by
the standard. Using two PoE controllers enables
driving 4-pairs ports.
Fully IEEE802.3af-2003 compliant
Supports IEEE802.3at, including
two-event classification
Supports Cisco devices detection
Supports pre-standard PD detection
Drives independent 2-pairs power
ports or synchronized 4-pairs ports
(with two PD69101)
Each PD69101 drives two direct
LEDs
Includes On/Off command pin
Configurable load current setting
Configurable AT/AF modes
Each PD69101 has built in 3.3 VDC
regulator
Thermal protection
DC disconnection method
Voltage monitoring/protection
Optional continuous port monitoring
and system data
RoHS compliant
Overall Description _______
The system has two main modes of operation:
2-pairs PoE port, based on one
PD69101 controller (see Figure 1)
4-pairs PoE port, based on two
PD69101 controllers (see Figure 2)
Line
Transformer
RJ45
1
2
3
6
IN(-)
4
5
7
8
IN(+)
T1
PD69101
Figure 1: 2 Pairs Mode
(-)
(+)
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Applicable Documents ____
Features __________________
Designing 1- port PoE System Using PD69101
Application Note 184
3.3 V and 5V Regulators
PD69101
IN(-)
Control
1
2
3
6
IN(-)
(+)
4
5 (+)
7
8 (-)
IN(+)
Optional for1 Gb/s
RJ45
(-)
A reset control signal is utilized to reset the PoE
circuit and disable the port.
T1
PD69101
Figure 2: 4 Pairs Mode
General Circuit Description___
The 1-port, 2-pair configuration shown in Figure 1
comprises one PoE manager circuit (PD69101),
acting as alternative-A feeding power over the data
lines. It is important to configure the PD69101 as a
Master to achieve proper operation.
The 1-port configuration shown in Figure 2,
comprises two PoE manager circuits (PD69101),
acting as Master and Slave. The PD69101 devices
are synchronized via a Sync pin connected between
them. To avoid abnormal operation, set-up one
circuit as a Master, with the other acting as a Slave.
The device that is connected to the data lines (1, 2,
3, and 6) should be configured as the Master. This
Master/Slave configuration only affects the device
behavior.
Indications
The PD69101 produces a direct 2 x LED indication,
utilized to indicate PoE events.
Monitoring Mode - Communication
Interface
In the monitoring mode, the PD69101 transmits out
(continuously and repeatedly) the port status, current
and voltage (option).
Data Out stream is transmitted
through LED 1 (pin 14)
Clock Out stream is transmitted
through LED 0 (pin 13)
Data stream is shifted out with a 1
MHz clock (1 µsec).
Detailed Circuit Description__
2 Pair Application Circuit
Main Supply
Refer to Figure 3.
The PoE system operates within a range of 44 to 57
VDC. To comply with UL SELV regulations,
maximum output voltage should not exceed 60 VDC.
Mode Configuration
This power must be isolated from the Switch supply
and chassis by 1500 Vrms.
Grounds
The system utilizes several grounds: chassis, digital
and analog.
The chassis ground is connected to the switch’s
chassis ground. This ground plane should be 1500
Vrms isolated from the PoE circuitry.
The digital and analog grounds are electrically the
same ground. However, to reduce noise coupling,
the grounds are physically separated and connected
only at a single point.
Set by the Mode0 and Mode1 lines (pins 21 and 22),
tied to GND or 3.3 VDC. In this application the
PD69101 is configured to work in the following
modes:
Master only
Master/Slave (pin 23) connected
to 3.3 VDC
Apply PoE on data lines
SYNC (pin 18) is pulled down to
AGND with a 4.7 KΩ resistor
(R9)
PoE Configuration:
Standard AT (AF/AT (pin 2) =
3.3 VDC, Current_Set (pin 1) =
GND)
IEEE802.3af/at compliant
resistor detection only
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
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IN(+)
Each PD69101 includes a 3.3 VDC and 5 VDC
regulator (VAUX3P3 & DRV_VAUX3P3, VAUX5),
providing up to 10mA. This current is utilized for
powering the PD69101 itself and an additional 2 mA
for components external to the PoE domain. Those
components must also be isolated by 1500 Vrms
from the switch circuitry.
Line
Transformer
Designing 1- port PoE System Using PD69101
Application Note 184
Direct LEDs drive indication (pins 13,
14)
The LEDs are driven from the
Vmain supply.
MODE0, 1 (pin 21, 22) connected
to DGND.
For different configurations refer to the PD69101
Data Sheet, Catalogue Number 06-0076-058.
Reference Current Source
Reference for internal voltages within the PD69101
is set by a precision resistor (R4).
Sense Resistors
Control Signals
Front-end Circuitry
The RESET_N line (pin 20) can be driven by the
Host CPU to the PD69101 to disable the PoE port.
When the PD69101 detects low level voltage at pin
20, it immediately enters RESET mode and disables
the port.
This circuit is the PoE manager analog front end of a
port.
When driving this line by the HOST CPU, use an
opto-coupler to isolate it 1500 VDC from the Switch
domain.
When using the RESET_N pin use a10 KΩ pull-up
resistor to DVDD.
Indication Signals
When Mode0 and Mode1 input pins are configured to
Serial Monitoring Mode (“01”), the LED 0 and LED 1
signals can be utilized to provide the Host CPU with
the following event indications (instead of direct LEDs
indication):
Port status
Vmain measurement
Vport measurement
Iport measurement
To use LED 1 and LED 0 to communicate and
monitor transmissions, use a 1 KΩ pull-up resistor to
the DVDD. When connecting these lines to the
HOST CPU, use an opto-coupler to isolate it 1500
VDC from the Switch domain.
VAUX3P3
The PD69101 provides 3.3 VDC operating potential.
Connect this line to the DRV_VAUX3P3 and use 4.7
uF coupling capacitor to AGND.
The PD69101 performs a multitude of internal
operations and PoE functions, requiring a bare
minimum of external components. Each PD69101
handles 1 port. Figure 4 illustrates the PD69101 with
related components for a 1-port configuration.
Note
For a solution of more than one port
described in this application note,
multiple the circuitry shown in Figure 3.
Output Port
The output port circuitry is supplied with voltage.
Terminal validity is established by comparing the
load resistance of the PD attached to the port
(meaning the voltage transmitted at the port) to predefined thresholds in the PD69101.
Additional components are used for the following:
D3 is a polarity reversal diode used to
prevent the application of reversed
external voltage.
C2 is a noise suppression component.
D4 is a prevision immunity protection
diode.
4 Pair Application Circuit
See Figure 3.
Mode Configuration
Set by MODE0 and MODE 1 lines (pins 21 and 22)
tied to GND or 3.3 VDC. In this application two
PD69101s are configured to work in the following
modes:
Master Slave
Master/Slave (pin 23) connected
to 3.3 VDC on the Master
PD69101 and to DGND on the
Slave PD69101.
Applies PoE on data and spear
lines
SYNC (pin 18) pins of the Master
and the Slave are connected
together and pulled up to the
DVDD with 4.7 KΩ resistor (R6)
PoE Configuration:
Standard AT (AF/AT (pin 2) =
3.3 VDC, Current_Set (pin 1) =
GND
IEEE802.3af/at compliant
resistor detection only
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 3
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A 0.499 Ώ (1%) sense resistor is connected to the
port output line. The voltage dropped over this
resistor represents the port’s current.
Designing 1- port PoE System Using PD69101
Application Note 184
Note Connect Master and Slave PoE
configuration must be the same for proper circuit
operation.
Direct LEDs drive indication (pins 13
and 14) from the Master PD69101
The LEDs are driven from the
Vmain supply.
Mode0 and Mode1 (pins 21 and
22) are connected to DGND.
For different configuration refers to PD69101 Data
Sheet, Catalogue Number 06-0076-058.
Control Signals
The Master RESET_N pin is connected via a 10 KΩ
pull-up resistor to the Slave 3.3 VDC ensuring that
the Master does not initialize before the Slave
voltage stabilizes.
The RESET_N line (pin 20) can be driven by the
Host CPU to both PD69101s to disables the PoE port
(see Figure 2).
To use LED1 and LED0 to communicate and
monitor transmissions, use a 1 KΩ pull-up resistor to
the DVDD.
Each PD69101 transmits its own port indications.
When connecting these lines to the HOST CPU, use
an optocoupler to isolate it 1500 VDC from the
Switch domain.
VAUX3P3
3.3V operating potential is provided by the PD69101.
Connect this line to the DRV_VAUX3P3 and connect
a 4.7 uF coupling capacitor to AGND.
The PD69101 performs a multitude of internal
operations and PoE functions, requiring a bare
minimum of external components. Each PD69101
handles one port. Figure 5 shows the PD69101 with
related components for a 1-port configuration.
Note For the solution of more than one port
described in this application note, multiply the
circuitry shown in Figure 5.
Reference Current Source
Reference for internal voltages within the PD69101
is set by a precision resistor (R4, R7).
Sense Resistors
A 0.499 Ώ, (1%) sense resistor is connected to port
output line. The voltage dropped over this resistor
represents the port’s current.
Front-end Circuitry
Figure 3: PD69101 4 Pair RESET_N
When the PD69101 detects low level voltage at
pin 20, it immediately enters the RESET mode and
disables the port.
This circuit is the PoE manager analog front end of a
port.
When driving this line by the HOST CPU use an
opto-coupler to isolate it 1500 VDC from the Switch
domain. When using the RESET_N pin use a 10 KΩ
pull-up resistor to DVDD.
The output port circuitry is supplied with a voltage.
Terminal validity is established by comparing the
load resistance of the PD attached to the port
(meaning the voltage transmitted at the port) to predefined thresholds in the PD69101.
Indication Signals
Additional components are used for the following:
When Mode0 and Mode1 Input pins are configured to
Serial Monitoring Mode (“01”) the LED0 and LED1
signals can be utilized to provide the Host CPU with
the following event indications (instead of direct LEDs
indication):
Port Status
Vmain measurement
Output Port
D3 and D5 are polarity reversal
diodes, used to prevent application of
reversed external voltage.
C2 and C6 are noise suppression
components.
D4 and D6 are prevision immunity
protection diodes.
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 4
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Vport measurement
Iport measurement
Designing 1- port PoE System Using PD69101
Application Note 184
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Figure 4: PD69101 2 Pair Circuitry
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 5
Designing 1- port PoE System Using PD69101
Application Note 184
WWW. Microsemi .COM
Figure 5: PD69101 4 Pair Circuitry
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 6
Designing 1- port PoE System Using PD69101
Application Note 184
Bill of Material for 2 Pair PoE Application
See Figure 4.
Qty
Reference
Reference
U1
1
C3
1
1
1
1
2
C2
C4
C5
C1
D3,D4
Footprint
PD-QFN244X5
PD-0805
PD-0805
pd-0402
PD-1210
D8H11_5F3_5
PD-SMA
1
J1
1000BASE-T
1
T1
2
D1,D2
COIL10X5F5_2F2_5
LEDEVERLIGHT204
1
1
R9
R4
PD-0402
PD-0402
Description
1 Port PSE IC
Mfr. Name
Microsemi
Manufacturer’s
P/N
Mfr. Part Number
PD69101
CAP CRM 4.7 uF 10 V
10% X5R 0805 SMT
AVX
0805ZD475KAT2A
Murata
GRM219R61A475KE19D
Taiyo Yuden
LMK212BJ475KD-T
AVX
08051C473KAT2A
Murata
GRM21BR72A473KA01L
Novacap
0805B473K101CTM
Samsung
CL21B473KCFNNNE
TDK
C2012X7R2A473K
Vishay
VJ0805Y473KXBAT
AVX
0402ZD105KAT2A
Murata
GRM155R61A105KE15D
Panasonic
ECJ-0EB1A105M
Taiyo Yuden
LMK105BJ105KV-F
AVX
12101C105KAT2A
Murata
GRM32ER72A105KA01L
Samsung
CL32B105KCJNNNE
TDK
C3225X7R2A105K
Taiyo Yuden
HMK325B7105KN-T
Nichicon
UVY2A470MPD1CA
Nippon Chemi-Con
EKMQ101ETD470MHB5D
Panasonic
ECA2AM470
Rubycon
100PX47M EFC T7 8X11.5
Diodes Inc.
US1G-13-F
TSC
US1G
Vishay
US1G-E3/61T
BOTHHAND
VP6014 LF
Star Electronic
TB080402-400UHMIN-2P-F
Kingbright
L-7104PGC
Kingbright
WP7104PGC
Lumex Opto
SSL-LX3044GC
ASJ
CR10-472JK
Panasonic
ERJ-2GEJ472X
Rohm
MCR01MZPJ472
Vishay
CRCW0402 4K70JNED
Yageo
RC0402JR-074K7L
Panasonic
ERJ2RKF3012X
Vishay
CRCW040230K1FKED
Yageo
RC0402FR-0730K1L
Description
CAP CRM 47 nF 100 V
10% X7R 0805 SMT
CAP CER 1.0 UF 10V
X5R 10% 0402
CAP Cer 1 uF 100 V 10%
X7R 1210 SMT
CAP ALU 47 uF 100 V
20% 8X11.5 105C P = 3.5
mm T/H
Dio Rec UF 400 V 1.0 A
50 nS SMA SMT
1000 Base ?T Single Port
Voice Over IP Magnetics
Module SMT
Common Mode Choke
400 uH 150 m ohm T/H
T-1{3 mm} Solid State
Lamp –P = 2.54 mm-TH
Resistor, SMT 4.7 K, 5%,
1/16 W 0402
RES TCK FLM 30.1K 1%
62.5mW 0402 SMT
Manufacturer
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 7
WWW. Microsemi .COM
Qty
1
Footprint
Designing 1- port PoE System Using PD69101
Application Note 184
Qty
2
1
Reference
R2,R3
R5
Footprint
PD-1206
PD-1210
Description
*RES 30.1 K 250 mW 1%
1206 SMT MTL FLM
RES TCK FLM 499
mOhm 100 PPM 0.5 W
1% 1210 SMT
Samsung
RC3216F3012CS
Yageo
RC1206FR-0730K1L
KOA
SR732ETTDR499F
Viking
CS13FTER499N
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
WWW. Microsemi .COM
Bourns
Manufacturer’s
P/N
CR1206-FX-3012ELF
Manufacturer
Page 8
Designing 1- port PoE System Using PD69101
Application Note 184
Bill of Material for 4 Pair PoE Application
See Figure 5.
QTY
2
2
2
2
1
U1, U4
C3,C7
C2,C6
C4,C8
C5,C9
C1
PD-QFN24-4X5
1 Port PSE IC
Microsemi
Manufacturer’s
P/N
PD69101
PD-0805
CAP CRM 4.7 uF 10V
10% X5R 0805 SMT
AVX
0805ZD475KAT2A
Murata
Taiyo Yuden
GRM219R61A475KE19
D
LMK212BJ475KD-T
AVX
08051C473KAT2A
Murata
Novacap
GRM21BR72A473KA01
L
0805B473K101CTM
Samsung
CL21B473KCFNNNE
TDK
C2012X7R2A473K
Vishay
VJ0805Y473KXBAT
AVX
0402ZD105KAT2A
Murata
Panasonic
GRM155R61A105KE15
D
ECJ-0EB1A105M
Taiyo Yuden
LMK105BJ105KV-F
AVX
12101C105KAT2A
Murata
Samsung
GRM32ER72A105KA01
L
CL32B105KCJNNNE
TDK
C3225X7R2A105K
Taiyo Yuden
HMK325B7105KN-T
Nichicon
UVY2A470MPD1CA
Nippon Chemi-Con
EKMQ101ETD470MHB5
D
ECA2AM470
Footprint
PD-0805
pd-0402
PD-1210
D8H11_5F3_5
Description
CAP CRM 47 nF 100V
10% X7R 0805 SMT
CAP CER 1.0 UF 10V
X5R 10% 0402
CAP CER 1 uF 100V 10%
X7R 1210 SMT
CAP ALU 47 uF 100 V
20% 8X11.5 105C P = 3.5
mm T/H
Manufacturer
Panasonic
Rubycon
4
D3-D6
PD-SMA
1
J1
1000BASE-T
2
T1,T2
2
D1,D2
COIL10X5F5_2F2_5
LEDEVERLIGHT204
1
R1
PD-0402
DIO REC UF 400V 1.0A
50 nS SMA SMT
1000 Base ?T Single Port
Voice Over IP Magnetics
Module SMT
Common Mode Choke
400uH 150 mohm T/H
T-1{3 mm} Solid State
Lamp –P = 2.54 mm-TH
Res Tck FLM 10 K 1%
62.5 mW 0402 SMT
Diodes Inc.
100PX47M EFC T7
8X11.5
US1G-13-F
TSC
US1G
Vishay
US1G-E3/61T
BOTHHAND
VP6014 LF
Star Electronic
Kingbright
TB080402-400UHMIN2P-F
L-7104PGC
Kingbright
WP7104PGC
Lumex Opto
SSL-LX3044GC
Bourns
CR0402-FX-1002GLF
Samsung
RC1005F1002CS
Vishay
CRCW0402-10K0 1%
ET1 E3
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 9
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2
Reference
Designing 1- port PoE System Using PD69101
Application Note 184
QTY
1
2
2
R6
R4,R7
R2,R3
R5,R8
Footprint
PD-0402
PD-0402
PD-1206
PD-1210
Description
Resistor, SMT 4.7K, 5%,
1/16W 0402
Res Tck FLM 30.1K 1%
62.5 mW 0402 SMT
*Res 30.1K 250 mW 1%
1206 Smt Mtl Flm
Res Tck Flm 499 mOhm
100 PPM 0.5W 1% 1210
SMT
Yageo
Manufacturer’s
P/N
RC0402FR-0710KL
ASJ
CR10-472JK
Panasonic
ERJ-2GEJ472X
Rohm
MCR01MZPJ472
Vishay
CRCW0402 4K70JNED
Yageo
RC0402JR-074K7L
Panasonic
ERJ2RKF3012X
Vishay
CRCW040230K1FKED
Yageo
RC0402FR-0730K1L
Bourns
CR1206-FX-3012ELF
Samsung
RC3216F3012CS
Yageo
RC1206FR-0730K1L
KOA
SR732ETTDR499F
Viking
CS13FTER499N
Manufacturer
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
1 Enterprise, Aliso Viejo, CA 92656; Within the USA: (800) 713-4113, Outside the USA: (949) 380-6100 Fax: (949) 215-4996
Page 10
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2
Reference
Designing 1- port PoE System Using PD69101
Application Note 184
Revision History
Revision
Level / Date
Para. Affected
Description
0.1 / 03/09
-
Initial release
1.0 Dec 2013
Figure 1
PD69001 changed to PD69101
© 2013 Microsemi Corp.
All rights reserved.
Visit our web site at: www.Microsemi.com
Catalogue Number 06-0079-080
For technical support, call: +972-9-7755123
In the USA: +631-756-4680 or 1-877-4-802-3A
Copyright © 2013
Microsemi
Rev 1.0/ 12-Dec-13
Analog Mixed Signal Group
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