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MAXM22511 Evaluation Kit
Evaluates: MAXM22511
General Description
Startup Procedure
1)
2)
3)
4)
The MAXM22511 evaluation kit (EV kit) is a fully assembled
and tested PCB that demonstrates the functionality of the
MAXM22511 isolated RS-485/RS-422 transceiver module.
The EV kit operates from a single 3.3V supply.
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 EV kits V
DDA
and
GNDA connectors.
Ensure that all jumpers are in their default positions
(see
Table 1).
Turn on the power supply.
Set the signal/function generator to output a 100kHz
0-to-3.3V 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.
Connect the signal/function generator to the TXD
test point.
Using the oscilloscope, verify that the Y, Z, and RXD
outputs switch as the TXD signal toggles.
Features
●
Operates From a Single 3.3V Supply
●
Terminal Block Connectors for Easy RS-485/RS-422
Evaluation
●
Up to 2500V
RMS
Isolation for 60s
●
Fully Assembled and Tested
Quick Start
Required Equipment
●
MAXM22511 EV kit
●
3.3V, 300mA DC power supply
●
Signal/function generator
●
Oscilloscope
5)
6)
Ordering Information
appears at end of data sheet.
319-100244; Rev 0; 8/18
MAXM22511 Evaluation Kit
Evaluates: MAXM22511
Detailed Description of Hardware
On-Board Resistor Configurations
To evaluate the MAXM22511 at the end-of-the-line in a
RS-485/RS-422 bus, close J6 to connect a 120Ω termina-
tion resistor (R3) between the A and B RS-485 receiver
inputs.
Close J5 to connect a 120Ω termination resistor (R2)
between the Y and Z driver outputs.
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. R7 and R9 pads are
provided for pullup and pulldown resistors on the Y
and Z lines. R10 and R12 pads provide 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 MAXM22511 features true fail-safe receiver
inputs, which ensures that RXD is high when the receiver
inputs are shorted, open, or connected to an idle bus.
The EV kit is a fully assembled and tested circuit board
for evaluating the MAXM22511 isolated RS-485/RS-422
transceiver module (U1). The EV kit is designed to evalu-
ate the MAXM22511 alone or in a standard RS-485 con-
figuration.
Powering the Board
The MAXM22511 operates from a single supply. Connect
an external 3.3V supply to the VDDA test point (TP6).
Connect the ground terminal of the supply to the GNDA
test point (TP7). The integrated DC/DC in the MAXM22511
generates the isolated power for the B-side/isolated side
of the board.
Evaluating the Isolated RS-485 Interface
Driver and Receiver Enable Selection
The EV kit features two jumpers (J2 and J4) to enable/
disable the driver and receiver outputs.
To enable the driver outputs (Y and Z), set the J4 jumper
to 1-2 (‘H’). Set J4 to 2-3 to disable the Y and Z outputs.
To enable the receiver on the MAXM22511, set the J2
jumper to 2-3 (‘L’). Set J2 to 1-2 to disable the receiver.
RS-485 Interface Protection
Enabling/Disabling Shutdown Mode
In shutdown mode, the internal DC/DC is disabled and no
power is generated on the isolated side of the board. The
J3 jumper is available to enable/disable shutdown mode
for the MAXM22511. Set the J3 jumper to 2-3 for normal
operation. Set J3 to 1-2 to enter shutdown mode.
The
SBA
output is high impedance during shutdown and
is not pulled high. The R6 pad on the board is available to
add a pull-up resistor to
SBA
if
SBA
must be high when
the MAXM22511 is in shutdown mode.
The MAXM22511 RS-485 interface pins (Y, Z, A and B)
feature internal ESD protection up to ±35kV ESD (HBM),
±18kV ESD (Air gap), ±8kV ESD (Contact). SM712 TVS
diodes have been added to the I/O lines for added pro-
tection up to ±30kV ESD (Air) and ±30kV ESD (Contact).
The SMT712 is also rated for protection against EFT up
to 40A (5/50ns).
Optimized EMI Layout
Loopback Configuration
The MAXM22511 features one drive channel and one
receive channel. Driver outputs are Y and Z and receiver
inputs are A and B. To configure the device for loopback
testing, close J7 and J8 to connect B to Z and A to Y,
respectively.
The MAXM22511 EV kit has been designed for easy
evaluation and is not optimized for EMI performance/
evaluation. See the Design Resources tab on the
MAXM22511 web page for more information about best
design practices for optimum EMI performance.
www.maximintegrated.com
Maxim Integrated
│
2
MAXM22511 Evaluation Kit
Evaluates: MAXM22511
Table 1. Jumper Table (J2–J8)
JUMPER
J2
J3
J4
J5
J6
J7
J8
*Default position.
SHUNT POSITION
1-2
2-3*
1-2
2-3*
1-2*
2-3
Open
Closed*
Open
Closed*
Open*
Closed
Open*
Closed
DESCRIPTION
RE
is high. The RS-485 receiver is disabled.
RE
is low. The RS-485 receiver is enabled.
SD is high. The MAXM22511 is in shutdown mode.
SD is low. The MAXM22511 is not in shutdown mode.
DE is high. The RS-485 driver outputs are enabled.
DE is low. The RS-485 driver outputs are disabled.
Y and Z are not connected through the on-board 120Ω termination resistor.
Y and Z are connected through the on-board 120Ω termination resistor.
A and B are not connected through the on-board 120Ω termination resistor.
A and B are connected through the on-board 120Ω termination resistor.
B is not connected to Z.
B is connected to Z.
A is not connected to Y.
A is connected to Y.
Ordering Information
PART
MAXM22511EVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
www.maximintegrated.com
Maxim Integrated
│
3
MAXM22511 Evaluation Kit
Evaluates: MAXM22511
MAXM22511 EV Kit Bill of Materials
ITEM REF_DES
1
2
3
4
5
6
C7
J2-J4
J5-J8
J9
J10, J11
R2, R3
DNI/
DNP QTY MFG PART #
-
-
-
-
-
-
1
3
4
1
2
2
EEE-HA1A470WR
PCC03SAAN
PEC02SAAN
1935200
142-0701-851
CRCW0603120RJN
MFG
PANASONIC
SULLINS
SULLINS
PHOENIX
CONTACT
JOHNSON
COMPONENTS
VISHAY DALE
VALUE
47UF
PCC03SAAN
PEC02SAAN
1935200
142-0701-851
120
DESCRIPTION
CAPACITOR; SMT (CASE_C); ALUMINUM-
ELECTROLYTIC; 47UF; 10V; TOL=20%; MODEL=HA
SERIES; TG=-40 DEGC to +105 DEGC; TC=
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT THROUGH; 3PINS; -65 DEGC TO +125
DEGC
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT; 2PINS
CONNECTOR; FEMALE; THROUGH HOLE; GREEN
TERMINAL BLOCK; STRAIGHT; 6PINS
CONNECTOR; END LAUNCH JACK RECEPTACLE;
BOARDMOUNT; STRAIGHT THROUGH; 2PINS;
RESISTOR; 0603; 120 OHM; 5%; 200PPM; 0.10W;
THICK FILM
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; YELLOW;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK;
PHOSPHOR BRONZE WIRE SILVER PLATE FINISH;
TESTPOINT WITH 1.80MM HOLE DIA, RED,
MULTIPURPOSE;
EVKIT PART-MODULE; 2.5KVRMS ISOLATED;
25MBPS; FULL-DUPLEX; RS-485/RS-422
TRANSCEIVERS WITH +/-35KV ESD PROTECTION;
LGA44; PACKAGE OUTLINE DRAWING: 21-100178
IC; PROT; ASYMMETRICAL TVS DIODE FOR
EXTENDED COMMON-MODE RS-485; SOT23-3
PCB:MAXM22511
CAPACITOR; SMT (0603); CERAMIC CHIP; 1UF; 25V;
TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 25V;
TOL=10%; MODEL=C SERIES; TG=-55 DEGC TO +125
DEGC; TC=X7R
CAP; SMT (2220); 3300PF; 10%; 250V; X7R; CERAMIC
CHIP
CAP; SMT (2211); 1000PF; 10%; 250V; X7R; CERAMIC
CHIP
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT; 8PINS; -65 DEGC TO +125 DEGC
RESISTOR; 0603; 49.9 OHM; 1%; 100PPM; 0.10W;
THICK FILM
RESISTOR; 1210; 0 OHM; 0%; JUMPER; 0.5W; THICK
FILM
RESISTOR; 0603; 10K; 1%; 100PPM; 0.10W; THICK
FILM
RESISTOR; 0603; 1K; 1%; 100PPM; 0.10W; THICK
FILM
7
TP1, TP2,
TP3, TP13-
TP16
-
TP4, TP7,
TP8, TP10,
TP11
-
TP6, TP9,
TP12
-
7
5014
N/A
5014
8
9
5
3
5011
5010
N/A
KEYSTONE
5011
N/A
10
11
12
U1
U2, U3
PCB
-
-
-
1
2
1
MAXM22511
SM712.TCT
MAXM22511
GRM188R71E105KA12D;
CGA3E1X7R1E105K;
TMK107B7105KA;
06033C105KAT2A
C1608X7R1E104K080AA
VJ2220Y332KXUSTX1
GA352QR7GF102KW01
PBC08SAAN
CRCW060349R9FK
CRCW12100000Z0
CRCW060310K0FK;ERJ-
3EKF1002
CRCW06031K00FK;ERJ-
3EKF1001V
MAXIM
SEMTECH
MAXIM
MURATA;
TDK;TAIYO
YUDEN;AVX
TDK
VISHAY
VITRAMON
MURATA
SULLINS
ELECTRONICS
CORP.
VISHAY DALE
VISHAY DALE
VISHAY DALE;
PANASONIC
VISHAY DALE;
PANASONIC
MAXM22511
SM712.TCT
PCB
13
14
15
16
17
18
19
20
21
C1, C4, C6 DNP
C2, C3, C5 DNP
C10
C11
J1
R1, R5
R4
R6
R7, R9,
R10, R12
TOTAL
DNP
DNP
DNP
DNP
DNP
DNP
DNP
0
0
0
0
0
0
0
0
0
32
1UF
0.1UF
3300PF
1000PF
PBC08SAAN
49.9
0
10K
1K
NOTE: DNI--> DO NOT INSTALL(PACKOUT) ; DNP--> DO NOT PROCURE
www.maximintegrated.com
Maxim Integrated
│
4
VDDA
TP6
2
2
4
3
5
2
4
3
5
1
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
GNDA
NC
NC
GNDA
GNDA
I.C.
VDDA
VDDB
VDDB
GNDB
Z
Y
VRECT
VLDO
SBA
RXD
RE
TXD
SD
DE
A
B
GNDB
NC
NC
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB
GNDB
3
3
J3
1
3
J4
1
2
DE
DNI
C11
R4
3
DNI
PROJECT TITLE -
MAXM22511_EVKIT_A
DATE -
02/2018
REVISION -
A
3
www.maximintegrated.com
C1
DNI
C2
+
1
DNI
TP9
C7
47UF
VDDB
VDDB
TP12
DNI
C3
C4
VRECT
DNI
C5
C6
DNI
DNI
TP7
TP10
MAXM22511 Evaluation Kit
TP8
TP11
MAXM22511 EV Kit Schematic
J10
142-0701-851
J11
142-0701-851
1
TXD
VDDA
R6
1
RXD
DNI
10K
TP1
TP2
/SBA
RXD
DNI
R5
MAXM22511
1
3
U1
SM712.TCT
U2
VDDA
J2
1
2
2
VDDB
DNI
R10
2
B
A
REB
TP13
J6
TP14
J7
DNI
J1
VDDA
TP3
DNI
TXD
R1
RXD
REB
DE
TXD
VDDA
VDDB
R3
120
J9
1
2
3
4
5
6
7
8
/SBA
SD
VDDA
Z
DNI
R7
DNI
R12
6
5
4
3
2
1
TP15
Y
J5
J8
2
SD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VRECT
TP16
R2
120
TP4
U3
SM712.TCT
VDDA
C10
DNI
DNI
R9
1
1
3
Evaluates: MAXM22511
2
2
Maxim Integrated
│
5
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