Texas Instruments TIDA-010046 Design Manual

Design Guide: TIDA-010046
EMC Compliant 10/100-Mbps Ethernet PHY Reference
Design With IEEE 802.3at Type-1 (≤ 12.95 W) PoE-PD
Description
This reference design provides a cost-optimized
solution for 10 to 100 Mbps using the low-power
Ethernet physical layer (PHY) DP83825I supporting
150-m reach over CAT5e cable which is beyond the
standard Ethernet distance limitation of 100 m (328
feet). Also, demonstrating power delivery over
Ethernet cable along with data communication using
IEEE 802.3at Type-1 (13 W) PoE-PD TPS23755
device with integrated primary side regulated flyback
DC/DC controller. This reference design is pre-
compliance tested for radiated emissions, ESDs and
EFTs.
Resources
TIDA-010046
DP83825I, DP83822I
TPS23755, TPS2121
ESDS312
TPS7A26, TPS23861, TPS7A4001
MSP430F5529
TPD2E001
LM3478, LP5907, LM5160
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USB
TIDA-010046
Isolation Isolation
PSE Side Board
Barrier Barrier
MSP430 MDIO
MDIO
MDC MDC
RMII
TVS ESD ESD TVS
Diode Diode Diode Diode
Array Array DP83825 Array Array
10/100MBPS
R ETH PHY PRBS ON
DP83822
J
10/100MBPS
4
ETH PHY
5
TVS ESD ESD TVS
Diode Diode Diode Diode
Array Array Array Array
Clock Source Status LEDs Status LEDs 48 V RTN
TPS7A4001 LDO TPS23861
3.3 V
LP5907 LDO (48 V to 3.3 V) PSE
5 V
for ETH
(5 V to 3.3 V)
PHYs
+48V
0 ...F
LM5160 LM3478
Iso. Fly-%XFNΠBoost DC/DC
3.3 V
LP5907 LDO (12 V to 3.6 V) (12 V to 48 V)
for (5 V to 3.3 V)
MSP430
+12V_IN
An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other
important disclaimers and information.
TIDUES1A – October 2019 – Revised February 2020
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USB
TIDA-010046
PD Side Board
Clock Source Status LEDs
Power + Data Out
MDIO
TVS ESD
MDC MSP430
Diode Diode
Array Array DP83825
10/100MBPS
R R ETH PHY
J J
Internal Loop-Back
4 4
5 5
Pin Headers
TVS ESD
Diode Diode (MAC)
Array Array
RMII
Ethernet
3.3 V for ETH PHY & MSP
Cable
TPS7A26 LDO
(12 V to 3.3 V)
Isolation Barrier
RTN
TPS23755
+48 V Power Powered Device (PD) with
Integrated DC/DC
EMC Compliant 10/100-Mbps Ethernet PHY Reference Design With IEEE
Copyright © 2019–2020, Texas Instruments Incorporated
Features
• Based on low-cost, low-power consumption and
small form-factor 10/100 Mbps Ethernet PHY
DP83825I with RMII support and 150-m cable
reach
• Efficient power delivery system via power over
Ethernet (PoE) using IEEE 802.3at Type-1 PoE-
PSE and PoE-PD
• Pre-compliance tested for radiated emission
requirement:
– CISPR 22 (EN 55022): meets Class A and B
limits
– FCC Part 15: meets Class A and B limits
• Pre-compliance tested for conducted immunity
requirements:
– ±12-kV contact discharge and ±15-kV air
discharge ESD IEC 61000-4-2: meets
criterion B
– ±2-kV IO capacitive coupling EFT per IEC
61000-4-4: meets criterion B
• External isolation transformer with common-mode
choke on PHY side for improved EMI and EMC
performance
• Programmable LED support for link and activity
Applications
• Video Surveillance
• Building Security Systems
• Fire Safety Systems
• HVAC (Heating, Ventilation and Air Conditioning)
External Loop-
Back
+12V_OUT
TPS2121
Power MUX
12 V_PoE +12V_IN
802.3at Type-1 (≤ 12.95 W) PoE-PD
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