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System Overview

24

TIDUES1A – October 2019 – Revised February 2020

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Copyright © 2019–2020, Texas Instruments Incorporated

EMC Compliant 10/100-Mbps Ethernet PHY Reference Design With IEEE
802.3at Type-1 (

≤

12.95 W) PoE-PD

Figure 22. Recommended 10/100 Mbps Twisted Pair Interfaces and Bob Smith Termination for PoE Port

as on PD Side Board

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Содержание TIDA-010046

Страница 1: ...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...

Страница 2: ...ucture upgrade is necessary PoE technology saves time and cost of installing separate power cabling AC outlets and wall warts as well as eliminates the need for a dedicated UPS for individual devices...

Страница 3: ...port with PoE PD MAC interface RMII Master and Slave mode Termination Integrated MDI and MAC termination resistors Status LED Two LEDs Link and activity with option to configure as PU or PD Clock 25 M...

Страница 4: ...d in RMII back to back mode and an IEEE 802 3at Type 1 compliant 15 4 W PSE TPS23861 it functions as a PoE Ethernet extender The PSE is the network PoE element that injects power onto an Ethernet cabl...

Страница 5: ...3 3 V TPS7A26 LDO 12 V to 3 3 V TPS2121 Power MUX Isolation Barrier Isolation Barrier Isolation Barrier PRBS ON 48 V RTN TVS Diode Array MDC MDIO MDIO MDC 0 F 5 V LM5160 Iso Fly XFN 12 V to 3 6 V 12V...

Страница 6: ...RMII to the DP83825I device which are then transmitted out from the RJ45 connector J8 over a 150 m Ethernet cable after injecting power to the PD side board The PSE side board is equipped with the nec...

Страница 7: ...r supplying power to network devices over the same cabling used to carry network traffic Therefore no infrastructure upgrade is necessary PoE technology saves time and the cost of installing separate...

Страница 8: ...om 2 4 System Design Theory 2 4 1 Reduced Media Independent Interface RMII For space critical designs the DP83825I 10 100 Mbps single port Physical Layer device incorporates the low pin count Reduced...

Страница 9: ...ide board the two Ethernet PHYs DP83822I and DP83825I are connected in RMII repeater mode The DP83825I device provides the option to enable repeater mode functionality to extend the cable reach Two DP...

Страница 10: ...lues 0x0000 0b00000 through 0x001F 0b11111 By default the DP83822I device will latch in the PHY address 0x0001 0b00001 The DP83825I device can be configured for up to 4 PHY addresses available through...

Страница 11: ...Table 3 This is achieved by using 2 49 k for R86 RH and do not populate R91 RL as highlighted in Table 4 and also shown in Figure 6 Table 2 DP83822I MAC Interface Configuration RGMII_EN RMIIEN XI_50...

Страница 12: ...1 S1 3V3_822_IO 3V3_IO 3V3_IO 3V3_IO GND_1 0 R31 DNP 0 R28 DNP 0 R37 2 2k R22 825_CLKOUT 1 F C24 470 R15 5 76k R85 DNP 2 49k R93 DNP GND_1 5 76k R87 DNP 2 49k R94 DNP GND_1 5 76k R88 DNP 2 49k R95 DN...

Страница 13: ...25 The DP83825I device offers programmable termination impedance for RMII interface and integrated MDI termination resistors as Figure 9 shows These features allow the removal of external series termi...

Страница 14: ...ce matching and EMC improvement The 10 100Base T Ethernet utilizes an Unshielded Twisted Pair UTP transmission cable consisting of four sets of twisted pairs connected in a balanced configuration The...

Страница 15: ...tap of the transformer should connect through a capacitor to ground forming a low pass filter with common mode choke as Figure 11 shows The CMRR cutoff frequency can be changed by common mode choke se...

Страница 16: ...ut for the TPS23861 PoE PSE device Figure 12 TPS23861 PoE PSE on PSE Side Board Layout NOTE Be sure the VPWR and VDD rails follow the proper power up sequence In this reference design the VPWR starts...

Страница 17: ...I device supports an external CMOS level oscillator source or an internal oscillator with an external crystal The use of a 25 MHz parallel 20 pF load crystal is recommended if a crystal source is desi...

Страница 18: ...An external isolation transformer is interfaced The TIDA 010046 design uses the HX1198FNL transformer from Pulse Electronics The device is a 1 1 transformer with an isolation of 1 5 kVRMS for 60 seco...

Страница 19: ...2 device place the 49 9 1 resistors and 0 1 F decoupling capacitor near the TD TD and RD RD pins and via directly to the AVDD plane as Figure 16 shows To reduce the crosstalk interference on signals k...

Страница 20: ...ground and circuit ground isolated by turning chassis ground into an isolated island by leaving a gap between the planes Connecting a 1206 size capacitor between chassis ground and circuit ground is r...

Страница 21: ...D_P 646 203 mils RD_N 644 074 mils Figure 17 Differential Signal Pair and Plane Crossing Figure 18 Differential Signal Traces 2 5 1 2 MDI Connections Between Isolation Transformer and RJ45 Connector F...

Страница 22: ...matched within 50 mils see Table 10 Do not overlap the circuit and chassis ground planes keep them isolated Connect chassis ground and system ground together using two size 1206 0 resistors across the...

Страница 23: ...e one set of capacitors on each side of the Ethernet magnetic Table 10 Differential Signal Trace Length From Magnetics to RJ45 Connector on PSE Side Board MDI DIFFERENTIAL PAIR NAME TRACE LENGTH FROM...

Страница 24: ...umentation Feedback Copyright 2019 2020 Texas Instruments Incorporated EMC Compliant 10 100 Mbps Ethernet PHY Reference Design With IEEE 802 3at Type 1 12 95 W PoE PD Figure 22 Recommended 10 100 Mbps...

Страница 25: ...tware Testing Requirements and Test Results 3 1 Required Hardware and Software 3 1 1 Hardware 3 1 1 1 PSE Side Board Top and Bottom Views Figure 23 shows the top view of the PSE side board All the ICs...

Страница 26: ...opyright 2019 2020 Texas Instruments Incorporated EMC Compliant 10 100 Mbps Ethernet PHY Reference Design With IEEE 802 3at Type 1 12 95 W PoE PD 3 1 1 2 PD Side Board Top and Bottom Views Figure 25 a...

Страница 27: ...to the bus The USB 2 MDIO tool allows users to read write script register read and write transactions and log data coming from the MDIO bus Download the USB to MDIO serial management tool from http w...

Страница 28: ...ation Barrier PRBS ON 48 V RTN TVS Diode Array MDC MDIO MDIO MDC 0 F 5 V LM5160 Iso Fly XFN 12 V to 3 6 V 12V_IN LM3478 Boost DC DC 12 V to 48 V 48V TVS Diode Array TVS Diode Array 48 V TVS Diode Arra...

Страница 29: ...a receiver it can suffer impairments The transmitter PCB traces connectors and cables will introduce interference that will degrade a signal both in its amplitude and timing An eye diagram is a common...

Страница 30: ...1 with less than a 5 chance of error Test Procedure 1 150 m Cable Length for Data Only Configure the IXIA link simulator to generate more than 20 million packets with random data Use 150 m long CAT5e...

Страница 31: ...bpart B Class A and B limits Conducted immunity IEC61000 6 2 for ESD and IEC61000 4 4 for EFT 3 2 2 3 1 Radiated Emission Test Any electronic products must pass applicable EMC requirements for the are...

Страница 32: ...ols and similar apparatus CISPR 14 1 EN 55014 1 Luminaires lighting equipment CISPR 15 EN 55015 Part 15 Part 18 Equipment with no product specific standard Light industrial IEC 61000 6 3 EN 61000 6 3...

Страница 33: ...Class B devices because they are more likely to be located close to a radio or TV receiver in the home environment Therefore for Class B emission limits are more restrictive than Class A by a factor...

Страница 34: ...xas Instruments Incorporated EMC Compliant 10 100 Mbps Ethernet PHY Reference Design With IEEE 802 3at Type 1 12 95 W PoE PD Figure 32 Actual Test Setup for Radiated Emission Test With Antenna Positio...

Страница 35: ...802 3at Type 1 12 95 W PoE PD To evaluate the radiated emissions of the DUT ambient EM levels at the test site first must be determined The ideal situation is for all of the ambient signals to be bel...

Страница 36: ...vised February 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated EMC Compliant 10 100 Mbps Ethernet PHY Reference Design With IEEE 802 3at Type 1 12 95 W PoE PD Fig...

Страница 37: ...0046 reference design is pre compliance tested for ESD and EFT with reference to standards IEC61000 4 2 and IEC61000 4 4 respectively The performance acceptance criterion is defined as in Table 14 Tab...

Страница 38: ...for functionality The test results show the TIDA 010046 reference design can withstand the required discharge see Table 15 There were no signs of any permanent failure or damage The DUT was found wor...

Страница 39: ...nd the other board was simply looping back those packets After the test the DUT was verified for functionality The test results show the DUT can withstand up to 2 kV The DUT performed normally after e...

Страница 40: ...Ethernet Physical Layer Transceiver Data Sheet 3 Texas Instruments TPS23861 Power On Considerations Application Report 4 Texas Instruments Selection and Specification of Crystals for Texas Instruments...

Страница 41: ...ntation Feedback Copyright 2019 2020 Texas Instruments Incorporated Revision History Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Chang...

Страница 42: ...e resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reprod...

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