MAX14775E Evaluation Kit
Evaluates: MAX14775E/MAX14776E
General Description
Startup Procedure
1)
2)
3)
4)
5)
6)
7)
The MAX14775E evaluation kit (EV kit) is a fully assembled
and tested PCB that demonstrates the functionality of
the MAX14775 20Mbps RS-485/RS-422 fault-protected
transceiver.
The MAX14775E EV kit may also be used to evaluate the
MAX14776E.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Set the DC power supply to 3.3V and connect the
DC power supply between the VCC and GND
connectors on the EV kit.
Ensure that all jumpers are in their default positions
(see
Table 1).
Connect the oscilloscope probes to the A, B, and RO
test points on the EV kit.
Turn on the power supply.
Set the signal/function generator to output a 1MHz
0-to-3.3V square wave.
Connect the signal/function generator to the DI test
point.
Using the oscilloscope, verify that the A, B and RO
outputs switch as the signal on DI toggles.
Features
●
Operates From a Single 3V to 5V Supply
●
Terminal Block Connectors for Easy RS-485/RS-422
Evaluation
●
Fully Assembled and Tested
Quick Start
Required Equipment
●
MAX14775E EV kit
●
3.3V, 500mA DC power supply
●
Signal/function generator
●
Oscilloscope
Ordering Information
appears at end of data sheet.
19-8706; Rev 0; 11/16
MAX14775E Evaluation Kit
Evaluates: MAX14775E/MAX14776E
Detailed Description of Hardware
The EV kit is a fully assembled and tested circuit board for
evaluating the MAX14775E high speed RS-485/RS-422
transceiver (U1). The EV kit has been designed to allow
for evaluating the MAX14775E alone or in a standard
RS-485 network.
Table 1. Jumper Table (J1-J5)
JUMPER
SHUNT PO-
SITION
Open*
J1
Closed
Open*
J2
Closed
1-2
J4
2-3*
1-2*
J5
2-3
*Default position.
DESCRIPTION
DE and
RE
are not connected
together.
DE and
RE
are connected
together.
A and B are connected through
the on-board 120Ω termination
resistor.
A and B are not connected
through the on-board termina-
tion resistor.
RE
is high. The RS-485 receiver
is disabled.
RE
is low. The RS-485 receiver
is enabled.
DE is high. The RS-485 driver
outputs are enabled.
DE is low. The RS-485 driver
outputs are disabled.
Driver and Receiver Enable Selection
The EV kit features three jumpers (J1, J4, and J5) to
enable/disable the driver and receiver outputs. Set J4
to 2-3 to enable the receiver. Set J5 to 1-2 to enable the
driver. To actively control both enables, remove J4 and J5
shunts and close J1, which connects DE and
RE
together.
Resistors R2–R4 Configuration
For end-of-the-line transceivers, close J2 to connect
a 120Ω termination resistor (R2) between the A and B
RS-485 receiver inputs on the MAX14775E.
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 will vary with the application. R1 and R3 pads are
provided for pullup and pulldown resistors on the A and
B lines, if needed. The use of any of these resistors is
purely optional. Note that the MAX14775E features true
fail-safe receiver inputs, which ensures that RO is high
when the receiver inputs are shorted, open, or connected
to an idle bus.
Ordering Information
PART
MAX14775EEVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
Surge Protection
Some industrial applications require extra components on
the A and B lines to protect against high voltage surges.
Pads for D1 and D2 TVS diodes are included on the
MAX14775E EV kit for this purpose. The use of these
diodes is completely optional for normal operation.
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MAX14775E Evaluation Kit
Evaluates: MAX14775E/MAX14776E
MAX14775E EV Kit Bill of Materials
ITEM
REF_DES
1 C1
2 C2
3 J1, J2
4 J3
5 J4, J5
6 R1, R3
7 R2
8 TP1-TP5
TP6-TP9,
9 TP11, TP12
10 TP10
11 U1
12 D1, D2
13 PCB
DNI/
DNP QTY
-
-
-
-
-
-
-
-
-
-
-
DNP
-
C1608X5R1A106
1 M080AC
TDK
C0603C104K8RA
1C
KEMET
2 PCC02SAAN
1
MFG PART #
MFCTR
SULLINS
PHOENIX
1935789 CONTACT
CAPACITOR; SMT (0603); CERAMIC CHIP; 10UF; 10V; TOL=20%;
10UF
MODEL=C SERIES; TG=-55 DEGC TO +85 DEGC; TC=X5R
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 10V; TOL=10%;
0.1UF
MODEL=C0603 SERIES; TG=-55 DEGC TO +125 DEGC; TC=X7R
PCC02SAA CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT
N
THROUGH; 2PINS; -65 DEGC TO +125 DEGC
CONNECTOR; FEMALE; THROUGH HOLE; SCREW COMPACT TERMINAL
1935789 BLOCK; RIGHT ANGLE; 3PINS
VALUE
DESCRIPTION
2 PEC03SAAN
2 MCR10EZPJ121
1 MCR10EZPJ121
5
6
1
5011
5014
5010
MAX14775EATA
1+
0 SMAJ30CA
1 MAX14775E
SULLINS
PEC03SAAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 3PINS
ROHM
SEMICONDUCT
OR
120 RESISTOR; 0805; 120 OHM; 5%; 200PPM; 0.125W; METAL FILM
ROHM
SEMICONDUCT
OR
120 RESISTOR; 0805; 120 OHM; 5%; 200PPM; 0.125W; METAL FILM
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD
HOLE=0.063IN; BLACK; PHOSPHOR BRONZE WIRE SILVER PLATE
KEYSTONE
N/A
FINISH;
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD
HOLE=0.063IN; YELLOW; PHOSPHOR BRONZE WIRE SILVER PLATE
KEYSTONE
N/A
FINISH;
KEYSTONE
N/A
TESTPOINT WITH 1.80MM HOLE DIA, RED, MULTIPURPOSE;
MAX14775 IC; TXRX; +/-65V FAULT PROTECTED 20MBPS HALF-DUPLEX RS-485/RS-
MAXIM
EATA+
422 TRANSCEIVER; TDFN8-EP
ST
MICROELECTR
ONICS
30V
DIODE; TVS; SMA (DO-214AC); VRM=30V
MAXIM
PCB
PCB Board:MAX14775E EVALUATION KIT
TOTAL
24
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Maxim Integrated
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MAX14775E Evaluation Kit
Evaluates: MAX14775E/MAX14776E
MAX14775E EV Kit PCB Layouts
MAX14775E EV Kit—Top Silkscreen
MAX14775E EV Kit—Top
MAX14775E EV Kit—Bottom
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MAX14775E Evaluation Kit
Evaluates: MAX14775E/MAX14776E
MAX14775E EV Kit Schematic
TP1
TP2
TP3
TP4
TP5
TP10
VCC
VCC
1
10UF
C2
0.1UF
TP6
RO
VCC
R1
120
OPEN
J2
PCC02SAAN
DNI
D2
30V
PEC03SAAN
1
J4
VCC
2
8
TP7
RE
U1
MAX14775EATA+
VCC
RO
RE
DE
EP GND
A
B
DI
A
TP11
1
2
J3
2
1
3
J1
PCC02SAAN
1
2
1
2
3
6
7
4
R2
120
1935789
3
B
TP12
VCC
1
9
5
TP8
DE
2
J5
PEC03SAAN
R3
120
OPEN
D1
DNI
30V
TP9
DI
3
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