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User's Guide

SLLU122A–April 2010–Revised July 2010

ISO1176T/35T/3086T Evaluation Module

This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the

ISO1176T PROFIBUS™ Transceiver, the ISO35T RS-485 Transceiver, or the ISO3086T RS-485

Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all

three EVMs, this manual can be used for all three devices.

The EVM can be used to evaluate device parameters while acting as a guide for board layout. The board

allows for the connection of 50-Ω coaxial cables via QuietZone connectors. It also provides easy

connection points for oscilloscope probes. Banana jacks are provided for connection of a dc power supply.

These features provide the designer with a tool for evaluation and the successful design of an

end-product.

Contents

1 Overview ..................................................................................................................... 2

2 Recommended Equipment ................................................................................................ 8

List of Figures

1 ISO1176T Device Pinout and Block Diagram ........................................................................... 3

2 ISO35T Device Pinout and Block Diagram .............................................................................. 3

3 ISO3086T Device Pinout and Block Diagram ........................................................................... 3

4 ISO1176T/35T/3086TEVM Board......................................................................................... 5

5 Point-to-Point Simplex Circuit ............................................................................................. 6

6 Parallel Terminated Simplex Circuit ...................................................................................... 6

7 Five-Node Multipoint Circuit ............................................................................................... 7

8 Two-Node Multipoint Circuit ............................................................................................... 7

9 EVM Configuration for Inducing a Ground Potential Difference Voltage Between Nodes ........................ 8

10 PCB Top Layer ............................................................................................................ 12

11 Silk Screen – Top Side ................................................................................................... 13

12 Signal Traces – Bottom Layer ........................................................................................... 14

13 Silkscreen – Bottom Layer ............................................................................................... 15

List of Tables

1 EVM Configuration Options for ISO1176T............................................................................... 8

2 EVM Configuration Options for ISO35T and ISO3086T ............................................................... 9

3 ISO1176TEVM Bill of Material ........................................................................................... 10

4 ISO35TEVM Bill of Materials............................................................................................. 11

5 ISO3086TEVM Bill of Materials.......................................................................................... 11

SLLU122A–April 2010–Revised July 2010 ISO1176T/35T/3086T Evaluation Module

Summary of content (18 pages)

PAGE 1
User's Guide SLLU122A – April 2010 – Revised July 2010 ISO1176T/35T/3086T Evaluation Module This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the ISO1176T PROFIBUS™ Transceiver, the ISO35T RS-485 Transceiver, or the ISO3086T RS-485 Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all three EVMs, this manual can be used for all three devices.
PAGE 2
Overview 1 www.ti.com Overview This EVM allows for evaluation of either the ISO1176T PROFIBUS™ or ISO35T or ISO3086T RS-485 transceivers. The EVM comes with a single transceiver installed on the circuit board (U1), but any of the three devices can be evaluated using this single printed-circuit board (PCB). The PCB also contains a transformer and voltage regulator that is used to provide dc power to the right (bus) side of the device.
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Overview www.ti.com DW PACKAGE (TOP VIEW) function diagram 1 16 VCC2 D1 2 15 D2 GND 1 VCC1 3 14 GND 2 GND 2 4 13 B RE R 5 12 RE 6 11 A GND 2 DE 7 10 ISODE D 8 9 GND 2 R D 1 OSC 2 13 GALVANIC ISOLATION D1 D2 5 6 8 DE 7 12 10 B A ISODE Figure 1.
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Overview www.ti.com …."need not operate over the entire data signaling rate range specified nor be limited to 10Mbps. They may be specified to operate at data rates to satisfy specific applications. The upper bound is application dependent and beyond the scope of this standard. Maximum signaling rate is typically limited by the following: ratio of signal transition time to the unit interval, maximum allowable stub length, and the bandwidth of the interconnecting media.
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Overview www.ti.com Figure 4. ISO1176T/35T/3086TEVM Board 1.3 Configurations The ISO1176T/35T/3086TEVM board allows the user to evaluate performance of any of the three devices, or to connect easily to an existing PROFIBUS or RS-485 bus to evaluate system performance in an existing system. Also, multiple EVMs can be obtained to allow the user to construct various bus configurations.
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Overview 1.3.1 www.ti.com Point-to-Point The point-to-point configuration is shown in Figure 5. This configuration requires two EVMs, and although this is not the intended mode of operation for PROFIBUS/RS-485 devices, it is used for high noise or longer (higher loss) transmission lines. Due to the increased drive current, a single 100-Ω termination resistor on the EVM results in a differential bus voltage (Vod) twice as large as the normally doubled terminated line.
PAGE 7
Overview www.ti.com Figure 7. Five-Node Multipoint Circuit Notice that the bus configuration shown in Figure 7 can be redrawn as shown in Figure 8. Additional EVMs can be obtained and connected to the bus, but the termination resistors on those EVMs need to be removed so that the bus is terminated only at each end. T T U1 U2 Figure 8. Two-Node Multipoint Circuit 1.
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Recommended Equipment www.ti.com P1 P3 P3 Vcc 1 Vcc 2 P1 Vcc 2 Vcc 1 Interconnecting media Input Pattern to Driver J4 A J8 J8 A B J9 J9 B D EVM #1 GND 2 GND 1 EVM #2 GND 2 R Output from Receiver GND 1 P3 Power Supply No. 3 Power Supply No. 1 Power Supply No. 2 Figure 9. EVM Configuration for Inducing a Ground Potential Difference Voltage Between Nodes 2 Recommended Equipment • • • • 2.1 5-Vdc at 0.
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Recommended Equipment www.ti.com Table 1.
PAGE 10
Recommended Equipment www.ti.com Table 2. EVM Configuration Options for ISO35T and ISO3086T (continued) Jumper Function Configuration I/O Load JMP8 – Y Output R10 set source termination across R10 – 54 Ω JMP9 – Z Output mmm Driver pins Y and Z R10 – 54 Ω Jumper installed from pin 1 to pin 2 Jumper short installed to short U1-10 to GND2 JMP25 – A Test Point JMP26 – Z Test Point JMP27 – B Test Point JMP28 – Y Test Point JMP29 – GND2 JMP32 – Regulator Output 2.
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Recommended Equipment www.ti.com Table 4. ISO35TEVM Bill of Materials Item QTY Reference Value Footprint Manufacturer Part Number 1 1 C2 68 µF cc7260 SPRAGUE 592D68X0010R2T 2 1 C3 10 µF cc7343 SPRAGUE 293D106X0035D2W 3 1 C4 1 µF cc1206 AVX 12063G105ZATRA 4 1 C5 0.1 µF cc1206 AVX 12065C104JATMA 5 1 C6 0.
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Recommended Equipment 2.3 www.ti.com PCB Layout and Construction The ISO1176/35T/3086TEVM PCB is a 4-layer board. The top and bottom layers (Figure 10 and Figure 12) contain signal routing. The remaining layers (Figure 11 and Figure 13) are power and ground planes. These are split planes to keep the Vcc1/GND1 separate from Vcc2/GND2. The I/O traces are designed to have a characteristic impedance of 50 Ω. Figure 10.
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Recommended Equipment www.ti.com Figure 11.
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Recommended Equipment www.ti.com Figure 12.
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Recommended Equipment www.ti.com Figure 13.
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1 VCC1 JMP6 1 2 3 4 JMP30 Header 2x1 C17 10uF U3 1 2 Header 4x1 T1 1 2 3 4 P1 Banana-Jack 8 7 6 5 C16 22uF D2 1 4 LP2985A-33DBVR 2 1 C2 68 uF + C3 10 uF C4 1 uF + + C5 0.1 uF + VCC2 49.9 DNI JMP1 JMP27 B GND1 Header 3x1 D2 GND1 VCC1 R RE* DE Din R GND1 JMP5 Header 3x1 R11 Header 2x1 JMP32 VCC2 Header 4x1 Header 3x1 1 2 3 R7 1 2 3 4 GND2 A 1 2 3 JMP16 1 2 3 R1 1K C7 DNI U1 D1 1 Name 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 49.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.