evb-2084 evb user manual - smscww1.microchip.com/downloads/jp/devicedoc/evb2084user.pdf ·...

EVB-2084 EVB User Manual

SMSC EVB-2084 Revision 1.2 (03-31-06)
USER MANUAL


1 General DescriptionThe EVB-2084 allows users to evaluate a TMC2084 CircLinkTM controller that has been configured forstand-alone operation. The EVB-2084 includes slots for two connectors that can be used to directlyconnect the TMC2084 inputs and outputs to other devices; a variety of connectors are shipped withthe EVB-2084 that the user can install at his discretion. The EVB-2084 also comes with two RJ11 jacksthat can be used to attach to twisted pair networks.

The EVB-2084 is a compact, 90mm x 110 mm printed circuit board which includes the followingcomponents:

TMC2084

RS485 transceiver

5V power inlet (power supply is not included)

LEDs for TXEN and RCNERR

28 LEDs for I/O ports

Connectors for external I/O

Other components described in Chapter 11

Note: Multiple EVB-2084 Evaluation boards cannot communicate directly with each other. An EVB-2084 Evaluation Board can communicate with a host PCM-2074 Evaluation Board.

Note: Please download the latest version of this users manual and circuit diagrams from SMSC's website.

Revision 1.2 (03-31-06) SMSC EVB-20842

USER MANUAL


2 Connectors and LEDsThe photograph below shows the locations and identities of the connectors and LEDs on the EVB-2084.

Figure 2.1 The EVB-2084

Table 2.1 Table of Connectors and LEDs

DESIGNATOR SILKSCREEN DESCRIPTION

CN1 - Slot for 34-pin connector (not installed)

CN2 - Slot for 12-pin connector (not installed)

CN3, CN4 - RJ11 Jacks, connected on PCB, require external 125 ohm termination resistor (supplied with EVB)

CN7 +5V, GND 5V Power Supply Connection (Red +5V, Black-Ground)

D1-8 PA0 - PA7 Port A LEDs, ON = High

D9-16 PB0 - PB7 Port B LEDs, ON = High

D17-24 PC0 - PC7 Port C LEDs, ON = High

D25-28 PD0 - PD3 Port D LEDs, ON = High

D29 RCNERR Error LED, ON = Network Error

D30 TXEN TRANSMIT LED, ON = Transmitting

D30

CN3 CN4

CN7

CN2

CN1

D25-28

D9-16

D1-8

D17-24

D29

SW1

SMSC EVB-2084 Revision 1.2 (03-31-06)3

USER MANUAL


3 EVB Configuration (Jumper Settings)The illustration below shows the location of jumpers and switches on the EVB-2084

Note: CN1, CN2 JP1-3 and JP10-12 are not populated. In addition, JP13 does not exist.

Note: After power-up, if any jumper settings are changed, a hardware reset must be performed inorder for the changes to take effect.

Figure 3.1 Location of Jumpers and Switches

CN3 CN4

JP1 6 JP1 5

JP9

CN2

SW 1

SW2

JP 10

JP11

TMC2084

JP14

JP1

JP2

JP3

JP8

JP7

JP6

JP5

JP4

JP12

CN1

TMC2084 EV A-BOARD

IC1


USER MANUAL


3.1 Configuring the I/O Ports

The TMC2084 I/O Ports are configured using jumpers JP1 - JP3. Each jumper has two possiblepositions, “1-2” and “2-3”. The table below shows how the jumpers JP1-JP3 configure the I/O ports.The default configuration of the board, as it is shipped from the factory, is shown in bold.

3.2 Page Size

When the TMC2084 is interfaced to a TMC2072 or TMC2074 Host Controller, the TMC2084 must beconfigured to match the page size setting of the host controller. There are two possible settings, theyare configured using JP4.

Table 3.1 Configuring the I/O Ports Using JP1-3

JUMPER SETTING I/O CONFIGURATION

TRIGGER PINJP1 JP2 JP3 PD7-41 PD3-01 PC7-02 PB7-02 PA7-02

2-33 2-3 2-3 Input Input Input Output Output nPISTR1

2-33 2-3 1-24 Output nPISTR2

2-33 1-2 2-3 Output Output Input nPISTR1

2-33 1-2 1-24 Output -

1-2 2-3 2-3 FlagOutput

Input Input nPISTR1

1-2 2-3 1-24 Output nPISTR2

1-2 1-2 2-3 Output Input nPISTR1

1-2 1-2 1-24 Output -

Notes:1. When Ports C and D are used as outputs, they may not be configured as Open-Drain Outputs2. When Ports A and B are used as outputs, they may be configured as Open-Drain Outputs.3. When JP1 is configured in the 2-3 position, D29 and R32 must be removed.4. When JP3 is configured in the 1-2 position, SW1 must be removed.

Table 3.2 Configuring Page Size with JP4

SETTING PAGE SIZE

1-2 64-byte page (default)

2-3 128-byte page


USER MANUAL


3.3 Node ID

Each node in a CircLink network must have a unique Node ID. The Node ID of the EVB-2084 isconfigured using jumpers JP5-8 as shown in the table below. When the EVB-2084 is shipped from thefactory, its default Node ID setting is “0010”. The Node ID “0000” is reserved for system use and shouldnot be assigned.

3.4 Clock Rate

The TMC2084 has 5 possible clock rates. The clock rate determines the baud rate; the baud rate is1/8th the frequency of the clock rate. The clock rate is set using the JP9 jumper.

3.5 Output Port Default States

The initial/default setting of the TMC2084 output ports are determined by jumpers JP10-12 as shownbelow:

Table 3.3 Configuring the Node ID Using JP5-JP8

JUMPER SIGNAL DEFAULT ALTERNATIVE

JP5 NodeID3 Position 2-3 (NodeID3 = 0) Position 1-2 (NodeID3 = 1)




Table 3.4 Configuring the Clock Rate/Baud Rate Using JP9

Setting Clock Rate Baud Rate

40M 40 Mhz 5 Mbps

20M 20 Mhz (Default) 2.5 Mbps

10M 10 Mhz 1.25 Mbps

5M 5 Mhz 625 Kbps

2.5M 2.5 Mhz 312.5 Kbps

Table 3.5 Configuring the Default States of the Output Ports Using JP10-12

Jumper Description Default Alternative

JP10 Port A Defaults Up (Outputs = High) Down (Outputs = Low)

JP11 Port B Defaults Up (Output = High) Down (Outputs = Low)

JP12 Port C Defaults Up (Output = High) Down (Outputs = Low)


USER MANUAL


3.6 CMI Bypass Mode

The TMC2084 uses one of two signaling modes on its physical layer connection. CMI Mode is usedwith RS-485 or CAN transceivers. RZ mode (CMI Bypass) is used with HYC2000/4000 transceivers.JP14 configures this mode.

3.7 Configuring the Offset Resistors

When the EVB-2084 is used as a stand-alone device, the offset resistors must be connected, this isthe default configuration of the board. In other configurations, the offset resistors may have to beconnected or disconnected via JP15 and JP16. Both jumpers should always have the same setting -either both shorted (connected) or both open (disconnected). Refer to Section 9.3 for more details.

Table 3.6 Configuring CMI Bypass Mode with JP14

SETTING PAGE SIZE

1-2 CMI Mode (default)

2-3 RZ Mode (Bypass CMI)

Table 3.7 Configuring the Offset Resistors using JP15-16

SETTING USAGE

Short Connects Offset Resistors; Default Configuration. Use this configuration when the EVB-2084 is being used as a stand-alone device, is being used in a point-to-point configuration with one other device, or is at the end of a Circlink network with 3 or more devices.

Open Disconnect Offset Resistors. Use this configuration when the EVB-2084 is in a network with 3 or more devices and is not an end-node.


USER MANUAL


4 I/O Connectors CN1 and CN2The EVB-2084 provides slots where optional connectors CN1 (34-pin) and CN2 (12-pin) can beinstalled. These connectors allow external devices to exchange data directly with the TMC2084,without the use of buffers. The EVB is shipped with both male and female connectors for each slot,that can be installed by the user.

Note: Note: When connecting non-SMSC-supplied boards to the TMC-2084, make sure they adhereto the electrical specifications of the TMC-2084. Refer to the TMC2084 Datasheet for moredetails.

Table 4.1 Pin Assigments for CN1

Pin No. Attribute Name Pin No. Attribute Name

1 P GND 2 P GND

3 FO* nRCNERR (PD7) 4 FO* FO2 (PD6)

5 FO* FO1 (PD5) 6 FO* FO0 (PD4)

7 O* PD3 8 O* PD2

9 O* PD1 10 O* PD0

11 P GND 12 O PB7

13 O PB6 14 O PB5

15 O PB4 16 O PB3

17 O PB2 18 O PB1

19 O PB0 20 P GND

21 O PA7 22 O PA6

23 O PA5 24 O PA4

25 O PA3 26 O PA2

27 O PA1 28 O PA0

29 P GND 30 - N/C

31 - N/C 32 P VCC (+5V)

33 P VCC (+5V) 34 P VDD (+5V)

Legend: P = Power/Ground; O = Output, FO = Flag Output, N/C - No Connection


USER MANUAL


Note: Port C (PC7-PC0) is intended to be used as an input port. If Port C is configured as an outputport, remove dip switch SW1.

5 Reset CircuitThe power-on reset circuit of the EVB-2084 consists of resistors and capacitors and may not functionproperly with some power supplies. When the EVB-2084 is powered on, a hard-reset should alwaysbe applied by pushing the reset switch, SW2. After power-on, a hard-reset should also be appliedwhenever any jumper settings are changed.

6 Flag OutputsTest points TP5 through TP8, which are connected to PD7-4, are generally used to monitor theTMC2084 flag outputs. The functions associated with the flags can be selected using the FOSL3-0bits in the TMC2084 Configuration Register. However the function of the PD7 bit cannot be selected,it is always associated with the nRCNERR flag.

Note: Note: See the section 2.7 Flag outputs of the TMC2084 datasheet for details.

Table 4.2 Pin Assigments for CN2

Pin No. Attribute Name Pin No. Attribute Name

1 P VDD (+5V) 2 P VDD (+5V)

3 I PC0 4 I PC1

5 I PC2 6 I PC3

7 I PC4 8 I PC5

9 I PC6 10 I PC7

11 P GND 12 P GND

Legend: P = Power/Ground; I = Input


USER MANUAL


7 Mechanical Specification

Note: Each dimension represents a design value; all units are in mm.

8 Operating Conditions

Figure 1 EVB-2084 Mechanical Specification

Table 8.1 EVB-2084 Operating Conditions

PARAMETER SPECIFICATION

Supply Voltage +5V +/- 5%

Current Consumption 500 mA

Temperature Range 10 to 45C, no condensation

CN3 CN4

TMC2084 EVA-BOARD

110.004.00 4

.00

90.00

4.00

4.00

3.30 x4

EVB-2084 Board Size　（Top View）

Unit:[mm]

2.54


USER MANUAL


9 Connecting Twisted Pair Cables to the RJ11 ConnectorsThe EVB-2084 provides two RJ11 jacks to connect user-supplied twisted pair cables. These cablesshould have a characteristic impedance of 125 ohms and each end of the cable should have a 125-ohm termination resistor installed. Recommended cables and terminators:

Single wire type 125 ohm twisted pair cable (ARC-Cab/125T) from SMSC Japan

125Ω terminator (ARC-Term/125T) from SMSC Japan

For more recommendations on the cable-plant, refer to the TMC2084 data sheet.

9.1 Point-to-point Connection

Connect two evaluation boards as shown below. Attach a termination resistor to both ends.

9.2 Bus Connection

Connect three or more EVBs as shown below. Place termination resistors at each end of the network.

Note: In addition to the termination resistors, the Offset Resistors must be connected or disconnecteddepending on the location. Refer to Section 9.3 for more details.

Figure 9.1 Point-to-Point Twisted Pair Connection

Figure 9.2 Bus Connection for 3 or more Nodes

Offset Resistors: Connected

Evaluation Board 1


Evaluation Board 1

Termination Resistor

Termination Resistor Twisted Pair Cable

Twisted Pair Cable


Evaluation Board 1

Offset Resistors:Disconnected

Evaluation Board 2


Evaluation Board 3

Termination Resistor

Termination Resistor Twisted Pair Cable


USER MANUAL


9.3 Offset Resistors

The function of the offset resistors is to prevent the differential voltage on the twisted pair cable, whichis the voltage between the positive signal and the negative signal, from going to zero during idleperiods when nothing is driving the line. To maintain stable operation, the RS485 transceivers requirea differential voltage of generally at least 200mV.

The offset resistors, which operate as a pair, supply this differential. One Offset Resistor biases thepositive signal toward Vcc, while the other biases the negative signal toward ground. The configurationof the offset resistors within a CircLink node depends on how that node is connected within a network.The offset resistors should be installed on the end nodes of a network and should be removed ordisabled on the middle nodes of a network containing three or more nodes. This is shown in Figure 9.3below. (In the EVB-2084, the offset resistors are configured using JP15 and JP16.):

Figure 9.3 Offset Resistor Configuration

Offset Resistor Configurations: - Connect offset resistors on end-nodes - Remove or disconnect offset resistors on middle nodes

CircLink Controller

D R DR DR D R

Offset

Transmission line: positive

Transmission line: negative

RS485 IC

Remove offset resistors on EVBs located in the middle of the bus .

Termination resistor

Termination resistor

RS485 IC

RS485 IC

RS485 IC

CircLink Controller CircLink Controller CircLink Controller

OffsetOffset Offset


USER MANUAL


9.3.1 Calculating the Value of the Offset Resistors

The discussion explains how the Offset Resistor values are calculated, and refers to Figure 9.4.

In order to simplify the following discussion, assume the sink and source currents are zero (IA = IB = 0).

The voltage VAB between node A and B of the Receiver is:

Since VTH, the threshold voltage, ranges from -0.2V to +0.2V, and VAB > | VTH |, we can write anequation for Rl as follows:

However, we must guarantee that under worst-case conditions, the differential voltage exceeds therequired threshold voltage with some margin. These conditions, which occur when Vcc and Rt are attheir minimum values set a maximum value for Rl. The equation for the worst-case can be written asfollows:

For the worst case conditions, we assume that VCC(min) = 4.75V, that Rt(min) = 124 x 0.95 = 117.8Ω,and that the threshold margin is 0.05V, therefore VTH(max)=0.25V. Putting these together, we get:,

Therefore, Rl (nominal) = (1060.2 / 1.05) = 1009.7 Ω

To summarize, Rl (nominal)= 1.0KΩ when Rt (nominal) = 124Ω, the threshold margin is .05V, and allresistors have 5% tolerances. Rl changes with the threshold margin. For a threshold margin of 0.01V,Rl = 1.2kΩ; for a margin of 0.1V, Rl = 820Ω.

Since the actual IA and IB are not equal to 0, VAB may be less than 0.2V. Further tuning of the resistorvalues may be required. To do this, measure the voltage between the receiver inputs (VAB) during anidle period using a digital voltmeter or oscilloscope.

Figure 9.4 Offset Resistor Value Calculation

D

DE

R

A

B

Vcc

GNDR1

RS485

R1 IA

The transmission line side is in an open, or floating state.

Rt

IB

Receiver portion

R

Rt x (Vcc)(2 x Rl) +Rt

VAB =

Rt x (Vcc - VTH)2 x VTH

Rl=

Rt(min) x (Vcc(min)- VTH(max))2 x VTH(max)Rl (max)=

117.8 x (4.75 - 0.25)2 x 0.25Rl (max)= =1060.2Ω


USER MANUAL


9.4 RJ11 Pin Out

As shown in the figure above, only the two middle pins are used regardless of the number of pinsavailable. The pin just to the left of the middle is always positive (L+) and the pin just to the right ofthe middle is always negative (L-).

9.5 Routing to Modular Jack Connectors

Figure 9.5 Pin Out of an RJ-11 Modular Jack (Front View)

Figure 9.6 Routing to Modular Jack Connectors

4 Pin Type 6 Pin Type

Polarity

Pin Number

CN4 Modular jack connector

1 2 3 4

CN3 Modular jack connector1

2 3 4

L+ L-


USER MANUAL


10 Transceiver ImplementationThe use of a non-isolated RS485 transceiver (the method used by the PCM-2074) is shown in thefigure below.:

For other transceiver implementations, refer to the CircLink Application Notes on the SMSC website.

11 Additional Items Included with the EVB-2084

12 Care and Usage Information

12.1 Precautions for Handling and Storage1. For proper operation, environmental and power supply limitation requirements must be adhered to.

2. Do not expose the EVB-2084 to chemicals or to liquids, such as water or oil, or to moisture orvapor during handling or storage. Such exposure may result in electrical shock, short circuits,damage to the EVB-2084, or fire.

3. Use and store the EVB-2084 on a stable, level surface, and avoid mechanical vibration or shock.

Figure 10.1 Non-Isolated RS485 Transceiver

ITEM QTY DESCRIPTION

1 1 Straight, 34-pin, Male Connector for CN1 (installed on board)

2 1 34-pin Female connector for CN1

3 1 Straight, 12-pin, Male Connector for CN2 (installed on board)

4 1 12-pin Female connector for CN2

5 1 Female power cable for CN7

6 1 125Ω Termination Resistor

DI

DE

RE

A

B

RS-485 Transceive rLTC1485

TXEN

TXD

RXIN

L+

GND

1K

1K

Vcc (+5V)

Drv

Rcv

GND

R

L-


USER MANUAL


4. Do not subject the EVB-2084 to direct sunlight or excessive heat. Exposing the board to excessiveheat during use may damage it. Exposing the board to direct sunlight may cause damage orwarpage.

5. Do not use or store boards in dusty places.

6. Avoid using the EVB-2084 near TVs, radio receivers, cordless phones or similar devises. TheEVB-2084 may cause Electro-Magnetic Interference with these devices.

7. Do not use or store the EVB-2084 near equipment that generates strong electro-magnetic fields.Exposure to excessive Electro-magnetic fields may damage the board.

8. Do not put heavy loads on top of the EVB-2084 as this may damage it.

9. Avoid exposing the EVB-2084 to exogenous material such as metal particles. These may causeshort circuits and fire.

12.2 Installation Procedure1. Make sure the EVB-2084 and all other system components are powered off.

2. Make sure you safely discharge any electrostatic charge before handling the EVB-2084 or anyother system component.

3. Confirm that all jumpers and DIP switches are set correctly.

4. Make all non-power connections, avoiding the use of excess force, and ensuring that connectorsare aligned correctly.

5. Apply power, after ensuring the correct value and polarity of the power supply connection.

6. Confirm correct operation of the evaluation board.

12.3 De-Installation Procedure1. Discharge any electrostatic charges before handling the EVB-2084 or other components.

2. Power off the evaluation board and all other system components before removing boards orconnectors to prevent damage.

3. Avoid excessive force when removing cables, boards, sockets or devices to avoid damaging them.

12.4 Miscellaneous Warnings

If there is a possibility that adjacent boards may contact each other, insert an insulator between themto avoid electric contact which may cause a defect in the board, system or peripherals, electric shock,or fire.


USER MANUAL


Copyright © 2006 SMSC or its subsidiaries. All rights reserved.

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, noresponsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time withoutnotice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSCor others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errorsknown as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could causeor contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and furthertesting and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard MicrosystemsCorporation (“SMSC”). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIESOF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY ANDALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS ORREVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TOHAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCHDAMAGES.

Revision 1.2 (03-31-06) 17 SMSC EVB-2084USER MANUAL

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