Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• MAX13485E EV kit
• 5V DC power supply
• Two digital voltmeters
Procedure
The MAX13485E EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Verify that the jumpers are in their default position,
as shown in Table 1. JU1 connects the 120Ωload
resistor between A and B.
2) For testing purposes, remove the shunt from JU1.
3) Connect the positive terminal of the 5V supply to
VCC and the negative terminal of the supply to GND.
4) Apply 5V on the RE and DE pads. This is a logic to
RS-485 DC test.
5) Apply 5V on the DI pad and check that A-B is posi-
tive.
6) Apply 0V on the DI pad and check that B-A is posi-
tive.
7) Apply 0V on RE and DE. Apply 5V on A and 0V on B.
This is an RS-485 to logic DC test.
8) Check the state of RO using a voltmeter. RO should
be approximately 5V.
General Description
The MAX13485E evaluation kit (EV kit) provides a
proven design to evaluate the MAX13485E half-duplex
RS-485/RS-422 transceivers in an 8-pin µDFN package.
The MAX13485E EV kit PCB comes with a
MAX13485EELA+ installed. Contact the factory for free
samples of the pin-compatible MAX13486EELA+ to
evaluate this device.
Features
♦Lead(Pb)-Free and RoHS Compliant
♦Proven PCB Layout
♦Fully Assembled and Tested
Evaluates: MAX13485E/MAX13486E
MAX13485E Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
19-4380; Rev 0; 12/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TYPE
MAX13485EEVKIT+ EV Kit
+
Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY DESCRIPTION
C1 1
0.1µF ±10%, 16V X7R ceramic
capacitor (0603)
TDK C1608X7R1C104K
C2 1
1µF ±20%, 10V X5R ceramic
capacitor (0603)
TDK C1608X5R1A105M
J1 1 2-position terminal block
JU1, JU2, JU3 3 2-pin headers
R1 1 120Ω ±5% resistor (1206)
R2, R3, R4, R5 4 Not installed, resistors (0603)
TP1, TP2 2 Not installed, test points
U1 1
RS-485 half-duplex transceiver
(8 µDFN)
Maxim MAX13485EELA+
— 3 Shunts
— 1 PCB: MAX13485E Evaluation Kit+
SUPPLIER PHONE WEBSITE
TDK Corp. 847-803-6100 www.component.tdk.com
Component Supplier
Note: Indicate that you are using the MAX13485E when contacting
this component supplier.
Evaluates: MAX13485E/MAX13486E
Detailed Description of Hardware
The MAX13485E EV kit provides a proven layout for the
MAX13485E. On-board pads are included for adding
external fail-safe resistors. JU2 can be used to monitor
the A and B lines with a differential probe. A terminal
block is also included to easily connect a cable to the EV
kit board.
An electrical grid with vias and GND vias are present on
the board to enable prototyping.
MAX13485E Evaluation Kit
2 _______________________________________________________________________________________
*
Default position.
Table 1. Jumper Table (JU1, JU2, JU3)
JUMPER SHUNT
POSITION DESCRIPTION
Open Does not connect the 120Ω resistor differentially between A and B
JU1 Closed* Connects the 120Ω resistor differentially between A and B
Open* R2 and R5 not connected
JU2 Closed Connects A and B through R2 and R5 if populated for testing custom termination and common-mode
Open Keeps DE and RE electrically separate
JU3 Closed* Shorts DE and RE
Evaluates: MAX13485E/MAX13486E
MAX13485E Evaluation Kit
_______________________________________________________________________________________ 3
Figure 1. MAX13485E EV Kit Schematic
Evaluates: MAX13485E/MAX13486E
MAX13485E Evaluation Kit
4 _______________________________________________________________________________________
Figure 2. MAX13485E EV Kit Component Placement Guide—
Component Side
Figure 3. MAX13485E EV Kit PCB Layout—Component Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
5
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Evaluates: MAX13485E/MAX13486E
MAX13485E Evaluation Kit
SPRINGER
Figure 4. MAX13485E EV Kit PCB Layout—Solder Side
