MAX149X2EVKIT [MAXIM]
Terminal Block Connectors for Easy RS-485/ PROFIBUS Evaluation;
| 型号： | MAX149X2EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Terminal Block Connectors for Easy RS-485/ PROFIBUS Evaluation |
| 文件： | 总13页 (文件大小：3442K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluates: MAX14940/MAX14943/
MAX14946/MAX14949
MAX149X2 Evaluation Kit
General Description
Quick Start
The MAX149X2 evaluation kit (EV kit) is a fully assembled
and tested PCB that demonstrates the functionality of the
MAX14943 isolated RS-485/PROFIBUS transceiver. The
EV kit operates from a single 3.3V supply and features an
on-board isolated power supply to power the secondary-
side of the circuit.
Required Equipment
● MAX149X2 EV kit
● 3.3V, 1A DC power supply
● Signal/function generator
● Oscilloscope
Startup Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
The MAX149X2 EV kit comes with the MAX14943GWE+
installed, but can also be used to evaluate the pin-compatible
MAX14940, MAX14946, and MAX14949 ICs.
1) Set the DC power supply to 3.3V and connect the
DC power supply between the EV kits VDDA and
GNDA connectors of the EV kit.
Features
● Operates from a Single 3.3V Supply
2) Ensure that J2 and J3 are in their default positions
(see Table 1).
3) Turn on the power supply.
4) Set the signal/function generator to output a 100kHz
0 to 3V square wave. Note: Set the signal/function
generator to operate with a high-impedance load. If
needed, the R1 pad is available to add a 50Ω impedance
to ground.
● Terminal Block Connectors for Easy RS-485/
PROFIBUS Evaluation
● 5000V
Isolation for 60s
RMS
● Fully Assembled and Tested
● Proven PCB Layout
Ordering Information appears at end of data sheet.
5) Connect the signal/function generator to the TXD
test point.
6) Verify that the A and B outputs switch as the signal
toggles.
Table 1. Jumper Settings (J1–J6)
JUMPER
SHUNT POSITION
DESCRIPTION
1-2
2-3*
Receiver is disabled. RXD is high impedance.
J1
Receiver is enabled. RXD is active.
1-2*
Driver is enabled. DEM is high.
J2
J3
2-3
Driver is disabled. DEM is low.
Open*
Closed
Open*
Closed
DE and RE are not connected together.
DE and RE are connected together.
A and B are not connected through the on-board 120Ω resistor.
Connects the on-board 120Ω resistor between A and B.
J4
*Default position.
19-7646; Rev 0; 6/15
Evaluates: MAX14940/MAX14943/
MAX14946/MAX14949
MAX149X2 Evaluation Kit
Resistors R2 – R4 Configuration
Detailed Description of Hardware
For end-of-the-line transceivers, close J4 to connect a
120Ω resistor (R3) between the A and B RS-485 I/Os on
the IC.
The MAX149X2 EV kit is a fully assembled and tested circuit
board for evaluating the MAX14943 isolated RS-485/
Profibus transceiver (U1). The EV kit has been designed
to allow for evaluating the IC alone or in a standard
RS-485 configuration. The EV kit is powered from a single
3.3V power supply.
Pullup and pulldown resistors are generally used on the
receiver inputs to guarantee a known state in the event
that all nodes on the bus are in receive mode, or the
cable becomes disconnected. The exact value for these
resistors varies with the application. Pads are provided for
pullup (R2) and pulldown (R4) resistors for the A-B lines,
although the use of these resistors is purely optional. Note
that the MAX14943 features true fail-safe receiver inputs
that ensure RXD is high when the receiver inputs are
shorted, open, or connected to an idle bus.
External Power Supply
The power on the EV kit is derived from a single 3.3V
source. Connect an external supply from GNDA to either
the VDDA test point or P1 connector to supply the 3.3V to
the logic side (A) of the circuit. The integrated push-pull
transformer driver and external transformer (TX1) generate
an isolated supply for powering the (B) isolated side of
the board.
Selecting a Transformer
Table 2 is a list of transformers designed to operate with
the device family. Select the transformer that best meets
the performance requirements of the end application. All
transformers in Table 2 can be used on the EV kit.
Evaluating the Isolated RS-485 Interface
Driver and Receiver Enable Selection
The EV kit features three jumpers (J1, J2, and J3) to
enable/disable the driver and receiver outputs. Set J1
to 2-3 to enable the receiver. Set J2 to 1-2 to enable the
driver. To actively control both enables, remove J1 and J2
and close J3, which connects DE and RE together.
Table 2. Transformer Selection
ISOLATION
A-SIDE
SUPPLY (V)
CAN BE USED WITH MAXIM
PART NUMBERS
MANUFACTURER/PART NUMBER
TURNS RATIO
VOLTAGE (V
)
RMS
HALO TGMS-1440V6LF
HALO TGMS-1464V6LF
HALO TGMR-1440V6LF
HALO TGMR-1464V6LF
WURTH 750315226
1CT: 1.33CT
1CT:2.4CT
1CT:1.33CT
1CT:2.4CT
1CT:1.3CT
1CT: 2CT
2750
5V
3.3V
5V
MAX14940, MAX14946
MAX14940, MAX14946
MAX14943, MAX14949
MAX14943, MAX14949
MAX14940, MAX14946
MAX14940, MAX14946
MAX14943, MAX14949
MAX14943, MAX14949
2750
5000
5000
3.3V
5V
2750
WURTH 750315228
2750
3.3V
5V
WURTH 750315230
1CT:1.3CT
1CT: 2CT
5000
WURTH 750315232
5000
3.3V
Maxim Integrated
│ 2
www.maximintegrated.com
Evaluates: MAX14940/MAX14943/
MAX14946/MAX14949
MAX149X2 Evaluation Kit
Component List, PCB Layout, and
Schematic
Ordering Information
PART
TYPE
See the following links for component information, PCB
layout diagrams, and schematics:
MAX149X2EVKIT#
EV Kit
#Denotes RoHS compliant.
●
●
●
MAX149X2 EV BOM
MAX149X2 EV PCB Layout
MAX149X2 EV Schematic
Maxim Integrated
│ 3
www.maximintegrated.com
Evaluates: MAX14940/MAX14943/
MAX14946/MAX14949
MAX149X2 Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
6/15
Initial release
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
│ 4
8
7
6
5
4
3
2
1
VLDO
VDDB
VLDO
T8
D
TX1
D
C
B
TGMR-1464V6LF
D1
D2
1
6
1
6
VDDB
T9
VDDA
C5
2
3
2
5
5
10UF
C3
10UF
3
4
4
VDDA
A
B
A
B
IN
IN
T10
T11
VDDA
T1
VLDO
VDDB
P1
1
2
VDDB
C4
C6
C7
C8
1UF
U1
MAX14943GWE+
0.1UF
1UF
0.1UF
DEM
DEM IN
T12
2
1
11
16
TD2
TD1
VLDO
VDDB
C
RXD
T4
R2
VDDA
OPEN
4
12
VDDA
A
C1
0.1UF
C2
IN
IN
A
B
1UF
5
6
RXD
J4
13
10
RE
B
VDDA
7
8
DE
DEM
RXD IN
J1
P2
IN DEM
VDDB
TXD
RE
T5
1
2
3
4
5
6
R3
RXD
IN
IN
IN
IN
2
14
9
15
GNDB
GNDB
GNDB
120
P3
RE
IN
1
2
3
4
5
6
DE
RE
TXD
3
GNDA
J3
DE IN
R4
OPEN
B
VDDA
TXD IN
J2
R1
OPEN
DE
T6
2
TXD
T7
T2
T13
GNDA
GNDB
T14
T3
A
A
PROJECT TITLE:
MAX149X2 EVKIT
DRAWING TITLE:
SIZE
DATE:
04/08/2015
HARDWARE NUMBER:
_
B
ENGINEER:
DRAWN BY:
REV:
A
TEMPLATE REV:
SHEET 2 OF 2
1.5
8
7
6
5
4
3
2
1
TITLE: Bill of Materials
DATE: 04/08/2015
DESIGN: max149x2_evkit_a
ITEM QTY REF DES MFG PART #
MANUFACTURER VALUE
KEMET/MURATA/T
DESCRIPTION
C0603C104K4RAC;
GCM188R71C104KA37;
C1608X7R1C104K;
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF;
16V; TOL=10%; TG=-55 DEGC TO +125 DEGC;
TC=X7R; NOT RECOMMENDED FOR NEW DESIGN
USE 20-000u1-01
CAPACITOR; SMT (0603); CERAMIC CHIP; 1UF;
25V; TOL=10%; MODEL=GRM SERIES; TG=-55
DEGC TO +125 DEGC; TC=X7R
CAPACITOR; SMT (0805); CERAMIC CHIP; 10UF;
25V; TOL=10%; MODEL=; TG=-55 DEGC TO +125
DEGC; TC=X5R
GRM188R71C104K;
C0603X7R160-104KNE
1
2
3
2 C1, C7
DK/VENKEL LTD.
0.1UF
GRM188R71E105KA12D;
3 C2, C6, C8 CGA3E1X7R1E105K
GRM21BR61E106K;
MURATA
1UF
C2012X5R1E106K125AB;
C2012X5R1E106K
2 C3, C5
MURATA/TDK
10UF
CAPACITOR; SMT; 0603; CERAMIC; 0.1uF; 25V;
10%; X7R; -55degC to + 125degC; +/-15% from -
55degC to +125degC; NOT RECOMMENDED FOR
NEW DESIGN USE - 20-000u1-01
C0603C104K3RAC;
GRM188R71E104KA01;
C1608X7R1E104K
KEMET/MURATA/T
DK
4
1 C4
0.1UF
DIODE; SCH; SCHOTTKY RECTIFIER; SMT (SOD-
123); PIV=20V; IF=0.5A; -55 DEGC TO +150 DEGC
CONNECTOR; MALE; THROUGH HOLE;
5
6
7
2 D1, D2
2 J1, J2
2 J3, J4
MBR0520
GENERIC PART
SULLINS
MBR0520
PEC03SAAN
PEC02SAAN
PEC03SAAN BREAKAWAY; STRAIGHT; 3PINS
CONNECTOR; MALE; THROUGH HOLE;
PEC02SAAN BREAKAWAY; STRAIGHT; 2PINS
SULLINS
CONNECTOR; FEMALE; THROUGH HOLE; GREEN
1935161 TERMINAL BLOCK; STRAIGHT; 2PINS
8
1 P1
1935161 PHOENIX CONTACT
CONNECTOR; FEMALE; THROUGH HOLE; GREEN
1935200 TERMINAL BLOCK; STRAIGHT; 6PINS
RESISTOR; 0603; 120 OHM; 5%; 200PPM; 0.10W;
120 THICK FILM
9
2 P2, P3
1 R3
1935200 PHOENIX CONTACT
CRCW0603120RJN VISHAY DALE
10
TEST POINT; JUMPER; STR; TOTAL
SULLINS
ELECTRONICS
CORP.
LENGTH=0.256IN; BLACK; INSULATION=PBT
CONTACT=PHOSPHOR BRONZE; COPPER PLATED
STC02SYAN TIN OVERALL
11
12
2 SU1, SU2 STC02SYAN
3 T1, T8, T9
TESTPOINT WITH 1.80MM HOLE DIA, RED,
5010 MULTIPURPOSE
5010 ?
5011 ?
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
RECOMMENDED FOR BOARD
T2, T3,
4 T13, T14
13
5011 THICKNESS=0.062IN
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN;
YELLOW; PHOSPHOR BRONZE WIRE SILVER
PLATE FINISH; RECOMMENDED FOR BOARD
5014 THICKNESS=0.062IN
T4-T7,
7 T10-T12
14
15
5014 ?
HALO
TGMR-
TRANSFORMER; SMT; 1:2.4; POWER
1 TX1
TGMR-1464V6LF
ELECTRONICS, INC 1464V6LF
TRANSFORMER; DRAFT DATASHEET ONLY
EVKIT PART-IC; PACKAGE CODE: W16M-9;
OUTLINE DRAWING NO.: 21-0042; LAND
MAX14943G PATTERN DRAWING NO.: 90-0107; WSOIC16
16
17
1 U1
1
MAX14943GWE+
MAX149x2
MAXIM
MAXIM
WE+
300MIL
PCB
PCB: MAX149x2
TOTAL
37
DO NOT PURCHASE(DNP)
ITEM QTY REF DES MFG PART #
MANUFACTURER VALUE
N/A OPEN
DESCRIPTION
1
3 R1, R2, R4 N/A
3
PACKAGE OUTLINE 0603 RESISTOR - EVKIT
TOTAL
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MAXIM
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