Texas Instruments RS485HFDPLXDRCEVM Manuale utente

User’s Guide

RS485HFDPLXDRCEVM User Guide

ABSTRACT

This document is the EVM User’s guide for the RS485HFDPLXDRCEVM which provides a quick way to evaluate

TI’s Half Duplex RS-485 Transceivers in 10-Pin VSON (DRC) Packages such as the THVD2450DRC

Caution Read the user's guide before use

The information in the warning statement is provided for personal protection and the information in the caution

statement is provided to protect the equipment from damage. Read each caution and warning statement

carefully.

This EVM contains components that can potentially be damaged by electrostatic discharge. Always transport

and store the EVM in its supplied ESD bag when not in use. Handle using an antistatic wristband. Operate on an

antistatic work surface. For more information on proper handling, see Electrostatic Discharge (ESD).

Table of Contents

1 Board Description...................................................................................................................................................................3

1.1 Features............................................................................................................................................................................. 3

1.2 Applications........................................................................................................................................................................3

1.3 Board Description...............................................................................................................................................................3

2 Powering the EVM...................................................................................................................................................................7

2.1 Dual Supply Operation (Separate Digital Logic and Driver Supplies)................................................................................ 7

3 Operating The EVM.................................................................................................................................................................8

3.1 Default Operation............................................................................................................................................................... 8

3.2 Potential Modifications for Single Ended Pins....................................................................................................................9

3.3 Potential Modifications for Differntial Pins........................................................................................................................10

4 Schematic.............................................................................................................................................................................. 11

5 Layout.................................................................................................................................................................................... 13

6 Bill of Materials..................................................................................................................................................................... 17

List of Figures

Figure 3-1. Jumper, Header Configuration Map.......................................................................................................................... 8

Figure 4-1. Schematic - DNI Components Shown..................................................................................................................... 11

Figure 4-2. Schematic with DNI Components Marked...............................................................................................................12

Figure 5-1. 3D View - Top.......................................................................................................................................................... 13

Figure 5-2. 3D View - Bottom.....................................................................................................................................................14

Figure 5-3. PCB Top Layer........................................................................................................................................................ 15

Figure 5-4. PCB Bottom Layer...................................................................................................................................................16

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RS485HFDPLXDRCEVM User Guide 1

List of Tables

Table 1-1. Jumpers, Headers, Terminals Descriptions................................................................................................................ 3

Table 1-2. Resistor Pad Descriptions...........................................................................................................................................4

Table 1-3. Capacitor Pad Descriptions........................................................................................................................................ 5

Table 1-4. LED Pad Descriptions.................................................................................................................................................6

Table 1-5. IC Pad Descriptions.................................................................................................................................................... 6

Table 2-1. Single Supply Operation Configuration.......................................................................................................................7

Table 2-2. Dual Supply Operation Configuration......................................................................................................................... 7

Table 3-1. Jumper Configuration for Default Operation............................................................................................................... 9

Table 3-2. Modifications For Single Ended Pins.......................................................................................................................... 9

Table 3-3. Modifications for Differential Pins..............................................................................................................................10

Table 6-1. Bill of Materials..........................................................................................................................................................17

Trademarks

All trademarks are the property of their respective owners.

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1 Board Description

1.1 Features

• Footprints for Both 10-Pin VSON (DRC) and 8-Pin SOIC (D) Half Duplex RS-485 Transceivers Indicated as

U1 and U2 Respectively.

• THVD2450VDRC Installed as U1 by Default

• 2 Power Supply Terminals (J5 and J6) to Supply a Power Signal to VL (DRC packages only) and VCC

Respectively.

• Can Short Power Supplies Together Via J15 if Single Supply for Logic and Device Are Wanted

• Power Supply Terminals allow for Power, Board-Ground, and Earth Connections.

• Power Supply Capacitors (2, 47 µF and 2, 10 µF – 1 of each Between Power and Board Ground and the

Other Between Board-Ground and Earth) Installed by J6 and Pads Available for J5.

• Ground Current Limiting Resistor Pads (R14 and R15) Available Between Board Ground and Earth on Both

J5 and J6

• Common Mode Voltage Connections (J12, J13, and J14) Available to Add a Common Mode Voltage to the

RS-485 Differential Bus (Pins A and B); Check Specific IC Datasheet for Details on Common Mode Ranges

• 120 Ω Termination Resistor (R17) Installed by Default on Board

• Capacitor Pad Between A and B Pins (C12) Available to Test Termination Capacitance Effects.

• Single Ended Inputs DE, /RE, and D All Have Pads to Support Pull-Up or Pull-Down Resistors.

• Single Ended Output R has Pads for a Pull-Up Resistor and a Capacitive Load

• Devices with SLR Pins Can be Controlled Via the J11 Jumper

• LED’s on R, D, and VCC Indicate Whether the Device is Receiving Data, Transmitting Data, and/or if the

Device has an Active Supply.

• Test Points on A and B Lines Near Termination Resistor.

1.2 Applications

• Motor drives

• Factory automation and control

• HVAC systems

• Building automation

• Grid infrastructureElectricity meters

• Process analytics

• Video surveillance

1.3 Board Description

The RS485HFDPLXDRCEVM is ready to operate directly out of box with a THVD2450DRC installed at U1. All

the signal and power jumpers/Inputs (J1 – J15) come pre-installed on board. Please see Table 1-1 through Table

1-5 for description for pads on the board, and to determine if it is pre-installed by default.

Table 1-1. Jumpers, Headers, Terminals Descriptions

Jumper ID Function Package Comment Installed?

J1 R Pin Output 8 Pin Header N/A Yes

J2 Enable 1 Input 8 Pin Header DE on DRC Packages Yes

J3 Enable 2 Input 8 Pin Header /RE on DRC Packages Yes

J4 D Pin Output 8 Pin Header N/A Yes

J5 VL Power Input 3 Pin Terminal Block N/A Yes

J6 VCC Power Input 3 Pin Terminal Block N/A Yes

J7 Termination Resistor

Connect

2 Pin Header Shunt J7 to Terminate A/B

with 120 Ωs

Yes

J8 Differential Bus Jumper 4 Pin Header N/A Yes

J9 Differential Bus Jumper 4 Pin Header N/A Yes

J10 RS-485 Bus Output 3 Pin Terminal Block N/A Yes

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Table 1-1. Jumpers, Headers, Terminals Descriptions (continued)

Jumper ID Function Package Comment Installed?

J11 SLR (Selectable Data

Rate) Pin Control

8 Pin Header SLR Pin not On Every IC

That is Approved for this

Board.

Yes

J12 Common Mode

Connection

4 Pin Header N/A Yes

J13 Common Mode A Input 4 Pin Header N/A Yes

J14 Common Mode B Input 4 Pin Header N/A Yes

J15 VL to VCC Shunt 2 Pin Header Shunt VCC to VL for

Single Supply Use Cases

Yes

Table 1-2. Resistor Pad Descriptions

Resistor ID Function Package Comment Installed?

R1 0 Ω Connection Series

Resistor

0603 For R Pin Yes

R2 Pull Up Resistor 0603 For R Pin No

R3 Current Limiting Resistor

for Diode

0603 For R LED D1 (R pin) Yes

R4 0 Ω Connection Series

Resistor

0603 For Enable 1 (DE on DRC

Pkg and /RE on D Pkg)

Yes

R5 Pull Up Resistor 0603 For Enable 1 (DE on DRC

Pkg and /RE on D Pkg)

R6 Pull Down Resistor 0603 For Enable 1

(DE on DRC Pkg and /RE

on D Pkg)

R7 0 Ω Connection Series

Resistor

0603 For Enable 2 (/RE on DRC

Pkg and DE on D Pkg)

Yes

R8 Pull Up Resistor 0603 For Enable 2 (/RE on DRC

Pkg and DE on D Pkg)

R9 Pull Down Resistor 0603 For Enable 2 (/RE on DRC

Pkg and DE on D Pkg)

R10 0 Ω Connection Series

Resistor

0603 For D Pin Yes

R11 Pull Up Resistor 0603 For D Pin No

R12 Pull Down Resistor 0603 For D Pin No

R13 Current Limiting Resistor

for Diode

0603 For D LED D2 (D Pin) Yes

R14 GND to EARTH Pull Down

for VL supply

0603 N/A No

R15 GND to EARTH Pull Down

For VCC Supply

0603 N/A No

R16 Current Limiting Resistor

for Diode

0603 for VCC LED (D3) Yes

R17 120ΩTermination Resistor 0805 Needed for RS-485

applications

Yes

R18 0 Ω Series connection

Resistor “B” Line

0603 N/A Yes

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Table 1-2. Resistor Pad Descriptions (continued)

Resistor ID Function Package Comment Installed?

R19 0 Ω Series connection

Resistor “A” Line

0603 N/A Yes

R20 Common Mode Voltage to

Bus Resistor for “B” Line

0603 Common Mode Test

Resistor = 375Ω; Found

on Backside of Board

R21 Common Mode Voltage to

Bus Resistor for “A” Line

0603 Common Mode Test

Resistor = 375Ω; Found

on Backside of Board

Table 1-3. Capacitor Pad Descriptions

Capacitor ID Function Package Comment Installed?

C1 Load Capacitance for “R” 0603 N/A No

C2 47 uF | 10 V Decoupling

Capacitor

0805 From GND to EARTH on

VL Supply

C3 47 uF | 10 V Decoupling

Capacitor

0805 From VL to GND on VL

supply

C4 10uF | 6.3V Decoupling

Capacitor

0805 From GND to EARTH on

VL Supply

C5 10uF | 6.3V Decoupling

Capacitor

0805 FROM VL to GND on VL

Supply

C6 47 uF | 10 V Decoupling

Capacitor

0805 From GND to EARTH on

VCC Supply

Yes

C7 47 uF | 10 V Decoupling

Capacitor

0805 From VCC to GND on

VCC Supply

Yes

C8 10 uF | 6.3 V Decoupling

Capacitor

0805 From GND to EARTH on

VCC Supply

Yes

C9 10uF | 6.3V Decoupling

Capacitor

0805 From VCC to GND on

VCC Supply

Yes

C10 100 nF | 6.3 V Decoupling

Capacitor

0603 From VL pin on U1 to

GND

Yes

C11 100 nF | 6.3 V Decoupling

Capacitor

0603 From VCC pin on U1 and

U2 to GND

Yes

C12 Termination Capacitance

Pad

0805 A to B Capacitor pad

to test different capacitive

loading conditions

C13 100 nF | 25 V Decoupling

Capacitor

0603 “A” Line Common Mode

Decoupling Capacitor

Yes

C14 100 nF | 25 V Decoupling

Capacitor

0603 “B” Line Common Mode

Decoupling Capacitor

Yes

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Table 1-4. LED Pad Descriptions

LED ID Function Package Comment Installed?

D1 “R” Line LED – Red Non-Standard N/A Yes

D2 “D” Line LED – Green Non-Standard N/A Yes

D3 “VCC” LED – Blue Non-Standard N/A Yes

Table 1-5. IC Pad Descriptions

IC ID Function Package Comment Installed?

U1 Half Duplex RS-485 IC

in DRC (10 Pin VSSON)

Package

DRC Comes Pre-installed with

THVD2450VDRC

Yes

U2 Half Duplex RS-485 IC in

D (8 Pin SOIC) Package

D N/A No

The default setup is optimized to work with the THVD2450VDRC operating in a single supply mode without a

common mode voltage. By shorting headers J7 (device termination) and J15 (VL = VCC) the board is ready

to operate in the default state. Please see section "Powering The EVM" for information on power supplies and

operational modes of the board respectively.

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2 Powering the EVM

Single Supply Operation (Logic Supply Equals Voltage Supply or DUT does not have VL pin)

Half Duplex RS-485 Transceivers in the DRC (VSSON) package from TI can have an additional logic supply pin,

VL. This is used to power the internal digital logic circuits inside of the device. In single supply operation mode

for devices, such as the THVD2450VDRC, the VL pin should be shorted to VCC by shorting J15 header pins,

so that the digital circuits are properly powered. If using an 8-pin D (SOIC) device in place of the DRC package,

there is only one supply pin and J15 can be left open. Please see Table 2-1 for single supply configuration based

on package.

Table 2-1. Single Supply Operation Configuration

Component ID IC Package Comment

J15 VSSON Shorted For Single Supply Operation

J15 SOIC Can be Left Open or Shorted – no VL pin to connect to.

J5 Either VL Supply – Leave Open

J6 Either VCC Power Terminal

C2 Either Leave DNI for Single Supply

C3 Either Leave DNI for Single Supply

C4 Either Leave DNI for Single Supply

C5 Either Leave DNI for Single Supply

R14 Either Leave DNI for Single Supply

To apply power onto the board, VCC is applied through the J6 terminal. With the board oriented with J6 on the

top left, as shown in Figure 3-1, the signals are, from right to left, EARTH, GND, and VCC. The EARTH and

GND distinction are used to help the end user determine operational qualities w.r.t. ground potential differences.

If testing methods on reducing ground loop current, install a resistor on pad R15. Check the datasheet for proper

powering considerations as this either recommend 3.3 V, 5 V or 3.3 V to 5 V.

2.1 Dual Supply Operation (Separate Digital Logic and Driver Supplies)

Half Duplex RS-485 Transceivers in the DRC (VSSON) package from TI can have an additional logic supply pin,

VL. In Dual Supply operation the digital circuit supply, the supply which supplies the R, D, RE, and DE pins, can

be held at a low level – typically from 1.65 V to 5 V to be able to interface a RS-485 transceiver to digital systems

using 1.8V logic. J15 should be left open. This option is only available for DRC (VSSON) packages. Please see

Table 2-2 for information on power supply components.

Table 2-2. Dual Supply Operation Configuration

Component ID IC Package Comment

J15 VSSON Left Open for Dual Supply Operation

J15 SOIC Dual Supply Not an Supported for SOIC

J5 VSSON VL Power Input

J6 VSSON VCC Power Input

C2 VSSON 47uF | 10V Decoupling Capacitor

C3 VSSON 47uF | 10V Decoupling Capacitor

C4 VSSON 10 uF | 6.3 V Decoupling Capacitor

C5 VSSON 10 uF | 6.3 V Decoupling Capacitor

R14 VSSON Can be added – however will be in parallel with R15 so make any

resistance calculations based on what’s on R15 and R14

Powering the board is like single supply option. J5 and J6 have the same pin orientation – from left to right it is

the EARTH pin, GND pin, and voltage supply pin. Attach VL power source to J5 and VCC power source to J6.

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3 Operating The EVM

3.1 Default Operation

With an understanding of how the board is setup and how to power the board for both supply situations the

next topic is how to operate the board. Out of the box the board, when powered, can operate the THVD2450V

as a half duplex RS-485 transceiver. The devices pins can be broken down into 4 distinct groups: single ended

communication pins, differential communication pins, power pins, and control pins. Power pins are discussed

in Powering the EVM and Dual Supply Operation (Separate Digital Logic and Driver Supplies). The following

details are for the other 3 categories.

The single ended communication pins are to be connected directly, through their respective jumpers, to a single

ended bus – these pins are the “R” and “D” pins and represent RX and TX single ended data respectively. For

both package types R is referenced to J1 and D is reference to J4 – these are the signal connection points for

the EVM.

Control signals can vary between devices. A a minimum this board supports an Active High Driver Enable (DE)

and an Active Low Receiver Enable (RE) these are accessed through Jumpers J2 and J3; however, the order

of these pins is dependent on package. Devices such as the THVD2450VDRC also contains a slew rate limiting

pin which turns on / off slew rate limiting for the device. In DRC packages without this feature, this pin should be

grounded. This pin is accessed through jumper J11.

Also, the last group of signals are the differential bus pins A and B. This connects to the differential bus through

terminal block J10. All differential data should be output/input through J10 to model the bus performance for a

specific application. For terminated bus operation J7 should be shunted.

A jumper configuration map is shown in Figure 3-1, where pin 1 is the top left corner of the shown jumpers with

every subsequent pin increasing by one in a clockwise direction. A summary table of component configuration in

Table 3-1 is shown below Figure 3-1.

Figure 3-1. Jumper, Header Configuration Map

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Table 3-1. Jumper Configuration for Default Operation

Jumper ID Signal – Jumper Pin Comment

J1 RX –Pin 4 or 7 Receive Data – to keep always high or low

shunt J1 I/O pins to VCC or GND.

J2 Enable – Pin 4 or 7 DE for VSSON and /RE for SOIC – shunt J2

I/O pins to VCC or GND if only 1 mode is to

be used.

J3 Enable – Pin 3 or 8 /RE for VSSON and DE for SOIC – shunt J3

I/O pins to VCC or GND if only 1 is to be

used

J4 TX – Pin 3 or 8 Transmit Data – to keep always high or low

shunt J4 I/O pins to VCC or GND

J11 SLR – Pin 2 and 7 Shunt I/O pin on J11 to either High or Low on

VSSON packages with SLR – if not included

Ground This Pin.

J7 N/A Shunt for Terminated Bus

Open for Unterminated Bus

J10 N/A Differential Bus Output Terminal.

J5 N/A Leave Floating for single supply applications,

attach digital supply if dual operation is used.

J6 N/A Attach VCC to J6

J15 N/A Shunt for Single Supply

Open for Dual Supply

3.2 Potential Modifications for Single Ended Pins

There are a few options with respect to the single ended data and control signals for modification on this EVM.

Jumpers J1 through J4 all contain pads that are blank by default. For D, DE, and RE signals there are 0603

sized pads for either pull-up or pull-down resistors to have a default logic on these pins with the added benefit of

still being able to external signals to this pin. The R pin also contains a pull-up resistor 0603 sized, as is common

in UART based applications, as well as a 0603 sized pad to ground for a capacitive load if testing requires

capacitive loading on the R pin. A summary of possible single ended signal pathway modifications on the EVM

are in Table 3-2.

Table 3-2. Modifications For Single Ended Pins

Associated Jumper / Signal `Pad ID Comment

J1 / R R2 Pull Up Resistor Pad

J1 / R C1 Capacitive Load Pad

J2 / EN1 R5 Pull Up Resistor Pad

J2 / EN1 R6 Pull Down Resistor Pad

J3 / EN2 R8 Pull Up Resistor Pad

J3 / EN2 R9 Pull Down Resistor Pad

J4 / D R11 Pull Up Resistor Pad

J4 / D R12 Pull Down Resistor Pad

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RS485HFDPLXDRCEVM User Guide 9

3.3 Potential Modifications for Differntial Pins

The Differential side of the RS-485 transceiver also has a few minor modifications that can be made. There is

the option for a termination capacitor, C12, along with the termination resistor. This capacitor can be used to help

estimate effects of capacitive cabling on the signal pathway. The other modification is by applying a common

mode voltage through the common mode jumpers J12 – J14 that is routed to the A and B lines through common

mode resistors, R20 and R21, which by default are not installed. For full common mode testing R20 and R21

should be selected to be 375 Ω as this is the standard for RS-485 devices. A summary of modifications can be

shown in Table 3-3.

Table 3-3. Modifications for Differential Pins

Associated Jumper / Signal Pad ID Comment

J12 and J13 / Common Mode on “A” R21 Common Mode Resistor to “A”

J12 and J14 / Common Mode on “B” R20 Common Mode Resistor to “B”

N/A / A and B C12 Termination Capacitor Pad

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