User’s Manual
Rev 0.00 Apr 2017
ISL32704EVAL2Z
User’s Manual: Evaluation Board
Industrial Precision
UG120 Rev.0.00 Page 2 of 12
Apr 3, 2017
UG120
Rev.0.00
Apr 3, 2017
ISL32704EVAL2Z
Evaluation Board User Guide
1. Overview
The ISL32704EVAL2Z board enables the evaluation of the ISL32704EIBZ isolated, half-duplex RS-485 transceiver in
a typical bus node application, used in isolated industrial networks.
1.1 Specifications
This board has been configured and optimized for the following operating conditions:
• Up to 4Mbps data rate
•V
CC = 3.3V
1.2 Ordering Information
1.3 Key Features
• Drive capability of up to 32x1 UL transceivers
• Isolated 3.3V to 5V DC/DC converter with regulated output
1.4 Related Literature
• For a full list of related documents, visit our website
•ISL32704E product page
Part Number Description
ISL32704EVAL2Z ISL32704EIBZ evaluation board
Figure 1.1 Block Diagram
LOGIC
I/O
RS-485
I/O
3.3V
SUPPLY
J5J2
J1
ISL32704EIBZ
ISOLATED
RS-485
TRANSCEIVER
ISOLATED
DC/DC
CONVERTER
5V
3
UG120 Rev.0.00 Page 3 of 12
Apr 3, 2017
ISL32704EVAL2Z 2. Functional Description
2. Functional Description
The ISL32704EIBZ is an isolated, 4Mbps, half-duplex RS-485 transceiver. The device incorporates a patented refresh
circuit to maintain the correct output state with respect to data input. At power-up, the bus outputs follow the truth
tables shown in Tables 2.1 and 2.2.
The DE input should be held low during power-up to prevent false drive data pulses on the bus. This is accomplished by
connecting the DE using a 10kΩ pull-down resistor to GND1.
This transceiver uses a differential input receiver for maximum noise immunity and common-mode rejection. Input
sensitivity is ±200mV, as required by the RS-485 specification.
The receiver input resistance meets the RS-485 “Unit Load” (UL) requirement of 12kΩ minimum. The receiver
includes a “fail-safe if open” function that ensures a high-level receiver output if the receiver inputs are unconnected
(floating). The receiver output is tri-statable through the active low RE input.
The RS-485 driver is a differential output device that delivers at least 1.5V across a 54Ω purely differential load. The
driver features low propagation delay skew to maximize bit width and to minimize EMI.
The driver in the ISL32704E is tri-statable through the active high DE input. The outputs of the ISL32704E driver are
not slew rate limited, so faster output transition times allow data rates of at least 4Mbps.
Important Notice:
For convenience, an isolated DC/DC converter is used to provide the power supply across the isolation barrier. Its
isolation ratings however, are lower than those of the transceiver. Therefore, it must be ensured that the ground
potential difference between the left side (GND1, GND2) and the right side (GND3, GND4) of the board remain below
50VAC (see Figure 3.1).
Table 2.1 Truth Table - Receiving
Receiving
Inputs Output
RE DE A-B R
00 ≥0.2V 1
0 0 ≤ -0.2V 0
0 0 Inputs Open/Shorted 1
1 1 X High-Z
1 0 X High-Z
Table 2.2 Truth Table - Transmitting
Transmitting
Inputs Outputs
RE DE D ISODE B A
X11101
X10110
0 0 X 0 High-Z High-Z
1 0 X 0 High-Z High-Z
UG120 Rev.0.00 Page 4 of 12
Apr 3, 2017
ISL32704EVAL2Z 3. PCB Layout Guidelines
3. PCB Layout Guidelines
Both supplies, VDD1 and VDD2, must be bypassed with 100nF ceramic capacitors. These should be placed as close as
possible to the supply pins for proper operation.
3.1 ISL32704EVAL2Z Evaluation Board
Figure 3.1 Top Side
Figure 3.2 Bottom Side
UG120 Rev.0.00 Page 6 of 12
Apr 3, 2017
ISL32704EVAL2Z 3. PCB Layout Guidelines
3.3 Bill of Materials
Manufacturer Part Qty
Reference
Designator Description Manufacturer
ISL32704EVAL2ZREVAPCB 1PWB-PCB, ISL32704EVAL2Z, REVA, ROHS IMAGINEERING INC
ISL32704EIBZ 1U1 ISOLATED, 4Mbps, HALF-DUPLEX RS-485
TRANSCEIVER, ROHS
Intersil
R1Z-3.305/P 1U2 ISOLATED 3.3V-TO-5V DC/DC CONVERTER
WITH REGULATED OUTPUT, ROHS
RECOM-POWER
CR0805-8W-1002FT (Pb-Free) 4R1 - R3, R7 RES, SMD, 0805, 10k, 1/8W, 1%, TF, ROHS VENKEL
RK73H2AT1330F 1R5 RES, SMD, 0805, 133Ω, 1/8W, 1%, TF, ROHS KOA
RC0805FR-07549RL 2R4, R6 RES, SMD, 0805, 549Ω, 1/8W, 1%, TF, ROHS YAGEO
C0805X5R160-106KNE 2C1, C3 CAP, SMD, 0805, 10µF, 16V, 10%, X5R, ROHS VENKEL
ECJ-2VB1E104K 2C2, C4 CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R,
ROHS
PANASONIC
1725656 1J1 CONN-TERMINAL BLK, TH, 2P, 6A, 125V,
20-30AWG, 2.54mm, ROHS
PHOENIX CONTACT
1725672 2J2, J5 CONN-TERMINAL BLOCK, 4POS, 0.1,
26-20AWG, 63V, 6A, ROHS
PHOENIX CONTACT
5001 4GND1 - GND4 CONN-MINI TEST PT, VERTICAL, BLK, ROHS KEYSTONE
5003 6A, B, D, R, DE, RE# CONN-MINI TEST POINT, VERTICAL, ORG,
ROHS
KEYSTONE
S-2261 1Place assy in bag BAG, STATIC, 4x6, ZIPLOC, ROHS ULINE
LABEL-DATE CODE 1AFFIX TO BACK
OF PCB
LABEL-DATE CODE_LINE 1: YRWK/REV#,
LINE 2: BOM NAME
INTERSIL
http://www.renesas.com
Refer to "http://www.renesas.com/" for the latest and detailed information.
Renesas Electronics America Inc.
1001 Murphy Ranch Road, Milpitas, CA 95035, U.S.A.
Tel: +1-408-432-8888, Fax: +1-408-434-5351
Renesas Electronics Canada Limited
9251 Yonge Street, Suite 8309 Richmond Hill, Ontario Canada L4C 9T3
Tel: +1-905-237-2004
Renesas Electronics Europe Limited
Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, U.K
Tel: +44-1628-651-700, Fax: +44-1628-651-804
Renesas Electronics Europe GmbH
Arcadiastrasse 10, 40472 Düsseldorf, Germany
Tel: +49-211-6503-0, Fax: +49-211-6503-1327
Renesas Electronics (China) Co., Ltd.
Room 1709 Quantum Plaza, No.27 ZhichunLu, Haidian District, Beijing, 100191 P. R. China
Tel: +86-10-8235-1155, Fax: +86-10-8235-7679
Renesas Electronics (Shanghai) Co., Ltd.
Unit 301, Tower A, Central Towers, 555 Langao Road, Putuo District, Shanghai, 200333 P. R. China
Tel: +86-21-2226-0888, Fax: +86-21-2226-0999
Renesas Electronics Hong Kong Limited
Unit 1601-1611, 16/F., Tower 2, Grand Century Place, 193 Prince Edward Road West, Mongkok, Kowloon, Hong Kong
Tel: +852-2265-6688, Fax: +852 2886-9022
Renesas Electronics Taiwan Co., Ltd.
13F, No. 363, Fu Shing North Road, Taipei 10543, Taiwan
Tel: +886-2-8175-9600, Fax: +886 2-8175-9670
Renesas Electronics Singapore Pte. Ltd.
80 Bendemeer Road, Unit #06-02 Hyflux Innovation Centre, Singapore 339949
Tel: +65-6213-0200, Fax: +65-6213-0300
Renesas Electronics Malaysia Sdn.Bhd.
Unit 1207, Block B, Menara Amcorp, Amcorp Trade Centre, No. 18, Jln Persiaran Barat, 46050 Petaling Jaya, Selangor Darul Ehsan, Malaysia
Tel: +60-3-7955-9390, Fax: +60-3-7955-9510
Renesas Electronics India Pvt. Ltd.
No.777C, 100 Feet Road, HAL 2nd Stage, Indiranagar, Bangalore 560 038, India
Tel: +91-80-67208700, Fax: +91-80-67208777
Renesas Electronics Korea Co., Ltd.
17F, KAMCO Yangjae Tower, 262, Gangnam-daero, Gangnam-gu, Seoul, 06265 Korea
Tel: +82-2-558-3737, Fax: +82-2-558-5338
SALES OFFICES
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ISL32704EVAL2Z User’s Manual: Hardware
Publication Date: Rev.0.00 Apr 3, 2017
Published by: Renesas
12
ISL32704EVAL2Z
UG120
