MAX14776E [MAXIM]
Operates From a Single 3V to 5V Supply;
| 型号： | MAX14776E |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Operates From a Single 3V to 5V Supply |
| 文件： | 总6页 (文件大小：594K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
Startup Procedure
General Description
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
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.
1) Set the DC power supply to 3.3V and connect the
DC power supply between the VCC and GND
connectors on the EV kit.
2) Ensure that all jumpers are in their default positions
(see Table 1).
The MAX14775E EV kit may also be used to evaluate the
MAX14776E.
3) Connect the oscilloscope probes to the A, B, and RO
test points on the EV kit.
4) Turn on the power supply.
5) Set the signal/function generator to output a 1MHz
0-to-3.3V square wave.
Features
● Operates From a Single 3V to 5V Supply
● Terminal Block Connectors for Easy RS-485/RS-422
Evaluation
● Fully Assembled and Tested
6) Connect the signal/function generator to the DI test
point.
Quick Start
7) Using the oscilloscope, verify that the A, B and RO
outputs switch as the signal on DI toggles.
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 1; 10/18
Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
Table 1. Jumper Table (J1-J5)
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.
SHUNT PO-
SITION
JUMPER
DESCRIPTION
DE and RE are not connected
together.
Open*
J1
DE and RE are connected
together.
Closed
Open*
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.
A and B are connected through
the on-board 120Ω termination
resistor.
J2
J4
A and B are not connected
through the on-board termina-
tion resistor.
Closed
Resistors R2–R4 Configuration
RE is high. The RS-485 receiver
is disabled.
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.
1-2
2-3*
1-2*
2-3
RE is low. The RS-485 receiver
is enabled.
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.
DE is high. The RS-485 driver
outputs are enabled.
J5
DE is low. The RS-485 driver
outputs are disabled.
*Default position.
Ordering Information
PART
TYPE
Surge Protection
MAX14775EEVKIT#
EV Kit
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.
#Denotes RoHS compliant.
Maxim Integrated
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Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
MAX14775E EV Kit Bill of Materials
ITEM REF_DES
DNI/DNP QTY MFG PART #
MANUFACTURER
VALUE
10UF
DESCRIPTION
CAPACITOR; SMT (0603); CERAMIC CHIP; 10UF; 10V; TOL=20%;
MODEL=C SERIES; TG=-55 DEGC TO +85 DEGC; TC=X5R
1 C1
-
1 C1608X5R1A106M080AC
TDK
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 10V; TOL=10%;
MODEL=C0603 SERIES; TG=-55 DEGC TO +125 DEGC; TC=X7R
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT
THROUGH; 2PINS; -65 DEGC TO +125 DEGC
2 C2
-
-
-
-
-
1 C0603C104K8RAC
2 PCC02SAAN
1
KEMET
SULLINS
0.1UF
3 J1, J2
4 J3
PCC02SAAN
CONNECTOR; FEMALE; THROUGH HOLE; SCREW COMPACT
1935789 PHOENIX CONTACT
SULLINS
1935789 TERMINAL BLOCK; RIGHT ANGLE; 3PINS
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT;
3PINS;
5 J4, J5
6 R2
2 PEC03SAAN
1 MCR10EZPJ121
PEC03SAAN
ROHM SEMICONDUCTOR
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 FINISH;
7 TP1-TP5
-
5
5011 KEYSTONE
N/A
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD
HOLE=0.063IN; YELLOW; PHOSPHOR BRONZE WIRE SILVER
PLATE FINISH;
TESTPOINT WITH 1.80MM HOLE DIA, RED, MULTIPURPOSE;
IC; TXRX; +/-65V FAULT PROTECTED 20MBPS HALF-DUPLEX RS-
8 TP6-TP9, TP11, TP12
9 TP10
-
-
6
1
5014 KEYSTONE
5010 KEYSTONE
N/A
N/A
10 U1
11 PCB
12 D1, D2
-
-
1 MAX14775EATA+
1 MAX14775E
0 SMAJ30CA
MAXIM
MAXIM
ST MICROELECTRONICS
MAX14775EATA+ 485/RS-422 TRANSCEIVER; TDFN8-EP
PCB
30V
PCB:MAX14775E
DIODE; TVS; SMA (DO-214AC); VRM=30V; IPP=8.3A
DNP
CRCW08051K00FK;ERJ-
6ENF1001V;MCR10EZHF10 VISHAY
13 R1, R3
TOTAL
DNP
0 01;RC0805FR-071KL
22
DALE;PANASONIC;ROHM;YAGEO
1K
RESISTOR; 0805; 1K; 1%; 100PPM; 0.125W; THICK FILM
Maxim Integrated
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Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
MAX14775E EV Kit Schematic
1
ꢂ
5
ꢉ
ꢀ
1
ꢂ
1
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Maxim Integrated
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Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
MAX14775E EV Kit PCB Layouts
MAX14775E EV Kit—Top
MAX14775E EV Kit—Top Silkscreen
MAX14775E EV Kit—Bottom
Maxim Integrated
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Evaluates: MAX14775E/MAX14776E
MAX14775E Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
11/16
10/18
0
1
Initial release
—
Updated Bill of Materials and Schematic
3–4
For 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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2018 Maxim Integrated Products, Inc.
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