Texas Instruments TIDA-010046 Скачать руководство пользователя страница 12 | Manualshive

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background image

GND_1

TD_OUT_M

TD_OUT_P

825_TX_EN

825_TX_D0

825_TX_D1

GND_1

RD_OUT_M
RD_OUT_P

825_RX_D0
825_RX_D1

825_RX_DV

825_VDDA3V3

MDIO
MDC

825_LED_0

GND_1

RST
PWRDWN

825_LED_2

825_CLK_IN

2.49k

R46

6.49k

R53

2

1

S2

+3V3_IO

+3V3_IO

1

3

4

2

G
G

25 MHz

Y3

GND_1

0

R59

0

R57

0

R55

DNP

GND_1

2.2k

R48

2.49k

R39

2.49k

R83

DNP

2.49k

R82

DNP

RX_ER

2.49k

R84

DNP

2.49k

R81

DNP

0

R41

DNP

825_CLKOUT

0

R38

825_XIN

825_XOUT

TX_EN

1

CLKOUT_50MHZ/LED_2

2

INT/POWERDOWN

3

LED_0(3V3 AWAYS) /S(A-NEG)

4

RST

5

VDDA3.3

6

RD_M

7

RD_P

8

GND

9

TD_M

10

TD_P

11

XO

12

XI/50MHZ IN

13

RBIAS

14

MDIO

15

MDC

16

RX_D1/S(MASTER/SLAVE)

17

RX_D0/S(PHYADD[1])

18

VDDIO

19

CRS_DV/S(PHYADD[0])

20

GND

21

RX_ER/S(A-MDIX)

22

TX_D0

23

TX_D1

24

DAP

25

DP83825IRMQR

U9

1µF

C42

470

R61

+3V3_825_IO

22pF

C46

22pF

C50

RX_D3/PHYAD4/CLKOUT

1

TX_CLK

2

TX_EN

3

TX_D0

4

TX_D1

5

TX_D2

6

TX_D3

7

INT/PWDN

8

RD_M

9

RD_P

10

TD_M

11

TD_P

12

NC

13

AVD33

14

NC

15

RBIAS

16

LED_0/AN_0/MLED

17

RESET

18

MDIO

19

MDC

20

VDDIO

21

XO

22

XI

23

CLK_O

24

RX_CLK

25

RX_DV/MII_MODE

26

CRS/CRS_DV/LED_CFG

27

RX_ER/AMDIX_EN

28

COL/PHYAD0/MLED

29

RX_D0/PHYAD1

30

RX_D1/PHYAD2

31

RX_D2/PHYAD3

32

PAD

33

U7

DP83822RHBR

GND_1

TD_IN_P

TD_IN_M

RD_IN_P

RD_IN_M

Green

1

2

D8

MDC

MDIO

822_TX_EN

822_TX_D0
822_TX_D1

822_RX_D0
822_RX_D1

822_RX_DV

GND_1

RESET

822_AVD3V3

1

3

4

2

G
G

25 MHz

Y2

DNP

12pF

C36

DNP

12pF

C32

DNP

GND_1

GND_1

2.49k

R25

2.49k

R21

470

R18

2.49k

R91

DNP

GND_1

822_XIN

822_XOUT

4.87k

R23

822_CLK_O

2

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

1µF

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

DNP

GND_1

5.76k

R89

DNP

2.49k

R96

DNP

GND_1

+3V3_IO

5.76k

R90

DNP

2.49k

R92

DNP

GND_1

LED_1

2.49k

R86

System Overview

12

TIDUES1A – October 2019 – Revised 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

Figure 6. DP83822I Schematic for Bootstrap Settings on PSE Side Board

The DP83825I device is connected with the DP83822I device in back-to-back RMII mode (repeater mode).
Therefore, configure pin 20 (with default function CRS_DV) as RX_DV for repeater mode. This can be
achieved in one of two ways:

•

Pullup resistor R39 (= 2.49 k

Ω

) on strap pin-2 (50MHzOut/LED2/S) as highlighted in

and also

in

•

Set bit-8 of the 0x302 register

Table 5. RMII MAC Mode Strap Table for DP83825I

PIN NAME

STRAP NAME

PIN #

DEFAULT

RX_D1

Master/Slave

17

0

0

RMII Master Mode

1

RMII Slave Mode

50MHzOut/LED2

RX_DV_En

2

0

0

Pin 20 is configured as CRS_DV

1

Pin 20 is configured as RX_DV (for

RMII repeater mode)

Figure 7. DP83825 Schematic for Bootstrap Settings on PSE Side Board

2.4.3.2

Hardware Bootstrap Configuration on PD Side Board

Since the DP83825I device is the only PHY on the PD side board, it operates in its default RMII master
mode. However, all the strap pins have provisions for populating the pullup strap resistors just in case the
device configuration needs to be changed as

shows.

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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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