MAX33071ESHLD [MAXIM]
Easy Evaluation of the MAX33071E;
| 型号： | MAX33071ESHLD |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Easy Evaluation of the MAX33071E |
| 文件： | 总9页 (文件大小：676K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
Features
General Description
The MAX33071E Shield evaluation kit (EV kit) is a fully
assembled and tested printed circuit board (PCB) that
demonstrates the functionality of the MAX33071E half-
duplex RS-485 transceiver, with ±65V fault protection,
extended ±40V common-mode range, and ±40kV ESD
Human Body Model (HBM) for A, B data lines. The EV
kit features a digital isolator, which is used as a level
translator between the RS-485 transceiver and the
controller interface.
•
•
•
•
•
Easy Evaluation of the MAX33071E
I/O Interface Compatibility from 1.71V to 5.5V
Proven PCB Layout
Mbed™/Arduino® Platform Compatible
Fully Assembled and Tested
Ordering Information appears at end of data sheet.
MAX33071E Shield EV Kit Photo
319-100699; Rev 0; 3/21
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
Quick Start
Required Equipment
•
•
•
•
MAX33071E Shield EV kit
3.3V (or 5V), 500mA DC power supply
Signal/function generator that can generate 250kHz square wave signal
Oscilloscope
Procedure
The EV kit is fully assembled and tested. Follow these steps to verify board operation:
1. Place the MAX33071E Shield EV kit on a nonconductive surface to ensure that nothing on the PCB gets shorted to
the workspace.
2. Set JU2 to 1-2 position (DE = 1) and JU3 to 1-4 position (
= 0). Set all the other jumpers to their default position as
shown in Table 1.
3. With +3.3V (or 5V) power supply disabled, connect the positive terminal to VCC_EXT and IOREF test points. Connect
the negative terminal to the GND test point.
4. Connect the positive terminal of the function generator to D0 (pin 1 of J4) and negative terminal to any GND test points
on the shield.
5. Set function generator to output a 250kHz square wave between 0V and 3.3V (or 5V), and then enable function
generator output.
6. Turn on the +3.3V (or 5V) DC power supply.
7. Connect an oscilloscope probe on D1 (pin 2 of J4) and verify the D1 output signal (RO) matches the D0 input signal
(DI).
Table 1. Jumper Settings
JUMPER
SHUNT POSITION
DESCRIPTION
VCC is shorted to +5V supply from shield header
VCC is shorted to VCC_EXT external supply
VCC is shorted to +3.3V supply from shield header
VCC is open
1-2
1-3*
1-4
JU1
Open
1-2
DE is shorted to VCC
1-3*
1-4
DE is connected to level shifter output
DE is shorted to GND
JU2
Open
1-2
DE is open
is shorted to VCC
1-3*
1-4
is connected to level shifter output
is shorted to GND
JU3
Open
1-2
is open
Connects 120Ω between A and B
Connects 60Ω between A and B
No load is connected between A and B
Connects POL to D7 of J4
JU4 & JU11
2-3*
Open
1-2*
Open
1-2*
Open
JU5
JU6
Disconnects POL from D7 of J4
Connects DE to D6 of J4
Disconnects DE from D6 of J4
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Maxim Integrated | 2
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
JUMPER
SHUNT POSITION
DESCRIPTION
1-2*
Open
1-2*
TVS Diode (DNI) connected to A
JU7
TVS Diode (DNI) disconnected from A
TVS Diode (DNI) connected to B
JU9
Open
1-2*
TVS Diode (DNI) disconnected from B
Connects VCC pin of U1 to supply rail
Disconnects VCC pin of U1 from supply rail
JU10
Open
Note: *indicates default jumper state.
Detailed Description of Hardware
The MAX33071E Shield EV kit is a fully assembled and tested circuit board for evaluating the MAX33071E fault-protected
half-duplex RS-485 transceiver (U1) with ±65V of fault protection. The EV kit is designed to evaluate MAX33071E alone
or in a RS-485 system. The EV kit enables Mbed or Arduroino platform to communicate on a RS-485 bus. The MAX14931
digital isolator is used as a level translator with a 1.71V to 5.5V supply range. Remove the 0Ω resistor R6 to apply the
transmitter input signal directly on the DI test point. Likewise, remove the 0Ω resistor R3 to measure the receiver output
signal directly on the RO test point.
If external protection is desired beyond the device’s built-in protection, the shield also features footprints for TVS diodes
(D1 and D2) that can be connected to the A and B lines using JU7 and JU9, respectively.
This evaluation kit should be used with the following documents:
•
•
MAX33071E data sheet
MAX33071E Shield EV kit (this document)
These documents, or links to them, are included on the MAX33071E Shield page. For the latest versions of the documents
listed, use this link: www.maximintegrated.com/MAX33071ESHLD
Powering the Board
This EV Kit requires two power supplies: one 3V–5.5V supply for the MAX33071E (U1) transceiver applied at the
VCC_EXT test point, and one 1.71V–5.5V supply for the microcontroller domain applied at the IOREF test point. When
the EV kit board is used with an Arduino/Mbed board, the power supply for U1 can also come from the Arduino/Mbed
board’s 3.3V or 5V rail. Place the shunt on 2-3 position of JU1 to connect VCC to VCC_EXT pin. Place the shunt of JU1
on 1-2 position or 1-4 position to connect the VCC of U1 to the Arduino/Mbed 3.3V or 5V supply rail. In this scenario,
IOREF is directly taken from the Arduino/Mbed header.
On-Board Termination
A properly terminated RS-485 bus is terminated at each end with the characteristic impedance of the cable. For CAT5 or
CAT6 cables, this is typically 120Ω on each end for a 60Ω load on the RS-485 driver. This EV kit features a selectable
60Ω or 120Ω load circuit between the A and B driver outputs. If the board is evaluated in a system and is connected at
the end of the cable, then select the 120Ω termination. The termination resistors on the EV kit should be changed to 60Ω
with a 100pF load to simulate a complete system load during evaluation.
DI and RO Configuration
Digital channels for DI and RO are selected through JU8. It consists of three columns and 16 rows. The columns labeled
DI and RO are connected to MAX33071E through the digital isolator (MAX14931FASE+ (U2)). The middle column is the
digital I/O pins, D0 to D15, from the Arduino/Mbed header. This provides flexibility for the user to select different resources
on the microcontroller to transmit and receive signals to and from the RS-485 transceiver. Table 2 shows the list of JU8
jumper options.
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Maxim Integrated | 3
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
Table 2. DI and RO Jumper Settings
JUMPER
SHUNT POSITION
DESCRIPTION
1-2*
Connects DI to D0
Connects DI to D1
Connects DI to D2
Connects DI to D3
Connects DI to D4
Connects DI to D5
Connects DI to D6
Connects DI to D7
Connects DI to D8
Connects DI to D9
Connects DI to D10
Connects DI to D11
Connects DI to D12
Connects DI to D13
Connects DI to D14
Connects DI to D15
Connects RO to D0
Connects RO to D1
Connects RO to D2
Connects RO to D3
Connects RO to D4
Connects RO to D5
Connects RO to D6
Connects RO to D7
Connects RO to D8
Connects RO to D9
Connects RO to D10
Connects RO to D11
Connects RO to D12
Connects RO to D13
Connects RO to D14
Connects RO to D15
4-5
7-8
10-11
13-14
16-17
19-20
22-23
25-26
28-29
31-32
34-35
37-38
40-41
43-44
46-47
2-3
JU8
5-6*
8-9
11-12
14-15
17-18
20-21
23-24
26-27
29-30
32-33
35-36
38-39
41-42
44-45
47-48
Note: *indicates default jumper state.
Flexible Interface Options
The EV kit allows multiple points of connection to the MAX33071E transceiver. This EV kit board could be placed on a
Arduino/Mbed compatible board to connect all the digital pins (DI, DE, RO, ) through the J3, J4 headers. These signals
could also be connected directly at their respective test points on the board, bypassing the digital isolator (U2). The A, B
signals are connected to a terminal block (J5) to easily connect to a twisted pair cable. Alternately, the A, B test points
may be used.
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Maxim Integrated | 4
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
PCB Layout for Thermal Dissipation
PCB layout can affect the performance of the transceiver in conditions with high common-mode voltage at high ambient
temperatures. The layout of the EV kit is designed to maximize thermal performance in such cases. Large copper pads
are used for all the pins. The GND pad is connected to a large copper plane on the top layer, with vias throughout the
plane connecting to the GND plane on the bottom layer. A thick trace from the VCC pad to JU10 allows for greater heat
dissipation at the V pin.
CC
Ordering Information
PART NUMBER
TYPE
MAX33071ESHLD#
EV Kit
#Denotes RoHS-compliant.
MAX33071E Shield EV Kit Bill of Materials
REF_DES QTY
MFG PART #
VALUE
DESCRIPTION
TEST POINT; PIN DIA=0.125IN; TOTAL
A, B
2
5127
N/A
LENGTH=0.445IN; BOARD HOLE=0.063IN; BLUE;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
GRM155R60J106ME44;
GRM155R60J106ME47;
C1005X5R0J106M050BC;
CL05A106MQ5NUN;
CAPACITOR; SMT (0402); CERAMIC CHIP; 10UF;
6.3V; TOL=20%; TG=-55 DEGC TO +85 DEGC;
TC=X5R
C1
1
10UF
C0402C106M9PAC
CAPACITOR; SMT (0402); CERAMIC CHIP; 0.1UF;
16V; TOL=5%; MODEL=; TG=-55 DEGC TO +125
DEGC; TC=X7R
C0402C104J4RAC;
GCM155R71C104JA55
C2-C4
C5
3
1
1
0.1UF
0.047UF
100PF
C1005X7R1E473K050BC;
GRM155R71E473K;
GCM155R71E473KA55
CAPACITOR; SMT (0402); CERAMIC CHIP; 0.047UF;
25V; TOL=10%; TG=-55 DEGC TO +125 DEGC
CAPACITOR; SMT; 0402; CERAMIC; 100pF; 50V;
10%; C0G; -55degC to + 125degC;
0 +/-30PPM/degC
C0402C101K5GAC;
C1005C0G1H101K050BA
C6
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; WHITE;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
DE, DI,
RE, RO
4
1
5012
5125
N/A
N/A
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; BROWN;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
IOREF
CONNECTOR; FEMALE; THROUGH HOLE;
.025INCH SQ POST SOCKET; STRAIGHT; 8PINS ;
J1, J4
J2
2
1
1
SSQ-108-24-G-S
SSQ-106-24-G-S
SSQ-110-24-G-S
SSQ-108-24-G-S
SSQ-106-24-G-S
SSQ-110-24-G-S
CONNECTOR; FEMALE; THROUGH HOLE;
.025INCH SQ POST SOCKET; STRAIGHT; 6PINS ;
CONNECTOR; FEMALE; THROUGH HOLE;
.025INCH SQ POST SOCKET; STRAIGHT; 10PINS ;
J3
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Maxim Integrated | 5
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
MAX33071E Shield EV Kit Bill of Materials (continued)
REF_DES QTY
MFG PART #
VALUE
DESCRIPTION
CONNECTOR; FEMALE; THROUGH HOLE; 5.08MM
TERM BLOCK CONNECTOR; STRAIGHT; 2PINS;
-30 DEGC TO +105 DEGC
J5
1
OSTTA024163
OSTTA024163
CONNECTOR; MALE; THROUGH HOLE;
BREAKAWAY; STRAIGHT; 4PINS
JU1-JU3
3
2
PEC04SAAN
PEC03SAAN
PEC04SAAN
PEC03SAAN
CONNECTOR; MALE; THROUGH HOLE;
BREAKAWAY; STRAIGHT; 3PINS
JU4, JU11
CONNECTOR; MALE; THROUGH HOLE;
BREAKAWAY; STRAIGHT THROUGH; 2PINS; -65
DEGC TO +125 DEGC
JU5-JU7,
JU9, JU10
5
PCC02SAAN
PCC02SAAN
CONNECTOR; MALE; THROUGH HOLE; 0.025IN SQ
POST HEADER; STRAIGHT; 48PINS
JU8
1
4
3
TSW-116-07-T-T
ERJ-2GE0R00
TSW-116-07-T-T
RESISTOR; 0402; 0 OHM; 0%; JUMPER; 0.10W;
THICK FILM
R3-R6
R7-R9
0
RESISTOR; 1206; 60 OHM; 10%; 200PPM; 0.25W;
THICK FILM
CRCW120660R0KNEAIF
60
TEST POINT; JUMPER; STR; TOTAL
LENGTH=0.24IN; BLACK;
INSULATION=PBT;PHOSPHOR BRONZE
CONTACT=GOLD PLATED
SU1-SU3,
SU5, SU6,
SU8-SU10
S1100-B;SX1100-
B;STC02SYAN
8
2
SX1100-B
N/A
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
TP18,
TP19
5011
EVKIT PART - IC; MAX33071E; CI25 - 70V FAULT
PROTECTED HALF DUPLEX RS-485; TRANSCEIVER;
U1
1
MAX33071EASA+
MAX33071EASA+ PACKAGE OUTLINE DRAWING:
21-0041; LAND PATTERN NUMBER: 90-0096;
PACKAGE CODE: S8+4; NSOIC8
IC; DISO; 3/1 CHANNEL; 150MBPS; DEFAULT LOW;
2.75KVRMS DIGITAL ISOLATOR; NSOIC16 150MIL
U2
1
1
MAX14931FASE+
5010
MAX14931FASE+
N/A
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; RED;
PHOSPHOR BRONZE WIRE SIL;
VCC_EXT
PCB
1
0
MAX33071ESHIELD
SM15T30CA
PCB
PCB:MAX33071ESHIELD
D1, D2
25.6V
DIODE; TVS; SMC (DO-214AB); VRM=25.6V; IPP=36A
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Maxim Integrated | 6
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
MAX33071E Shield EV Kit Schematic Diagram
B D ꢍ ꢌ
1 5
1 6
B D ꢍ ꢌ
ꢃ
A D ꢍ ꢌ
ꢄ
1
A D ꢍ ꢌ
2
1
2
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Maxim Integrated | 7
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
MAX33071E Shield EV Kit PCB Layout Diagrams
MAX33071E Shield EV Kit PCB Layout Diagram—Top
MAX33071E Shield EV Kit PCB Layout Diagram—Bottom View
Silkscreen
MAX33071E Shield EV Kit PCB Layout Diagram—Top View
MAX33071E Shield EV Kit PCB Layout Diagram—Bottom
Silkscreen
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Maxim Integrated | 8
MAX33071E Shield
Evaluation Kit
Evaluates: MAX33071E/MAX33070E
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
3/21
Release for market intro
—
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Mbed is a trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere
ꢆor pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2021 Maxim Integrated Products, Inc.
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