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MAX33250E Shield
Evaluates: MAX33250E
General Description
The MAX33250E Shield is a fully assembled and
tested PCB that demonstrates the functionality of the
MAX33250E, isolated 2Tx/2Rx RS-232 transceivers,
with a galvanic isolation of 600V
RMS
(60sec) between
the logic UART side and field side. The isolation barrier
protects the logic UART side from electrical transient
strikes from the field side. It also breaks ground loops and
large differences in ground potentials between the two
sides that can potentially corrupt the receiving and sending
of data. The MAX33250E conforms to the EIA/TIA-232E
standard and operates at data rates up to 1Mbps.
Quick Start
Required Equipment
●
MAX33250E Shield
● Function generator
●
Digital oscilloscope with 2 input channels
●
5V, 500mA DC power supply
Procedure
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
The Shield EV kit is fully assembled and tested. Follow
the steps below to verify board operation:
Place the MAX33250E Shield on a nonconductive
surface to ensure that nothing on the PCB gets
shorted to the workspace.
Make sure all jumpers are in their default positions
as shown in
Table 1.
Connect T1OUT test point to R1IN test point.
Connect T2OUT test point to R2IN test point.
Disable the output of the function generator.
Set the output of the function generator to 500kHz
(min = 0V, max = 5V) square wave.
Connect the positive terminal of the function genera-
tor to T1IN and T2IN test points.
Connect the negative terminal of the function gen-
erator to GNDA connector.
Connect the positive terminal of 5V supply to VCCA_
EXT connector.
Connect the negative terminal of 5V supply to GNDA
connector.
Connect the positive terminal of channel 1 of the
oscilloscope to R1OUT test point.
Connect the negative terminal of channel 1 of the
oscilloscope to GNDA connector.
Connect the positive terminal of channel 2 of the
oscilloscope to R2OUT test point.
Connect the negative terminal of channel 2 of the
oscilloscope to GNDA connector.
Enable the output of the function generator.
Verify 500kHz 5V square waves appear on both
channels of the oscilloscope.
Features
●
Single Supply
● On-Board Isolation Power Supply
● Arduino/Mbed Shield Interface and Form Factor
●
DCE/DTE Selectable DB9 Pinout
Ordering Information
appears at end of data sheet.
319-100249; Rev 0; 9/18
MAX33250E Shield
Evaluates: MAX33250E
Detailed Description of Hardware
Powering the Board
MAX33250E Shield is fully assembled and tested circuit
board for evaluating the MAX33250E 1Mbps, 600V
RMS
isolated RS-232 transceivers. The MAX33250E has 2
transmitters and 2 receivers (2Tx/2Rx). The isolation is
provided by Maxim’s proprietary insulation material that can
withstand 600V
RMS
for 60 seconds. The MAX33250E
conforms to the EIA/TIA-232 standard and operates at
data rates up to 1Mbps over the temperature range of
-40°C to +85°C.
The MAX33250E Shield, with an onboard DB9 connector,
enables Mbed or Arduino platforms to communicate on an
RS-232 bus. DCE/DTE DB9 pinout is selectable with the
SW1 switch. The MAX14850 digital isolator is used as a
level translator with a 3V to 5.5V supply range.
VCCA of MAX33250E can come from external supply or
the Arduino/Mbed platform supply. See
Table 1
for jumper
settings to select appropriate VCCA source.
The MAX33250E Shield has an on-board isolated power
supply that generates an isolated supply for VCCB. If the
shield board is connected to a Arduino/Mbed platform,
input of the isolated power supply is connected to the 5V
output (pin 4 of J3) of the Arduino/Mbed platform. The
voltage generated on the isolated output is same as the
input. See
Table 1
for jumper settings to select appropriate
VCCB source.
Table 1. Jumper Settings
JUMPER
SHUNT
POSITION
1-2
JU1
1-3
1-4*
JU2
JU3
JU4
JU5
JU6
1-2*
2-3
1-2*
OPEN
1-2*
OPEN
1-2*
OPEN
1-2*
OPEN
1-2
JU1D0
2-3*
OPEN
1-2*
JU1D1
2-3
OPEN
1-2
JU1D2
2-3
OPEN*
DESCRIPTION
Transceiver VCCA connects to 3.3V on Arduino/Mbed connector (J3)
Transceiver VCCA connects to 5V on Arduino/Mbed connector (J3)
Transceiver VCCA connects to VCCA_EXT connector
Transceiver VCCB connects to the output of the isolated power supply
Transceiver VCCB connects to VCCB_EXT connector
Transceiver T1IN connects to the level translator
Transceiver T1IN disconnects from the level translator
Transceiver T2IN connects to the level translator
Transceiver T2IN disconnects from the level translator
Transceiver R1OUT connects to the level translator
Transceiver R1OUT disconnects from the level translator
Transceiver R2OUT connects to the level translator
Transceiver R2OUT disconnects from the level translator
Transceiver T2IN connects to Arduino/Mbed connector’s D0 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D0 signal
Arduino/Mbed connector’s D0 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D1 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D1 signal
Arduino/Mbed connector’s D1 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D2 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D2 signal
Arduino/Mbed connector’s D2 signal is not connected
www.maximintegrated.com
Maxim Integrated │
2
MAX33250E Shield
Evaluates: MAX33250E
Table 1. Jumper Settings (continued)
JUMPER
SHUNT
POSITION
1-2
JU1D3
2-3
OPEN*
1-2
JU1D4
2-3
OPEN*
1-2
JU1D5
2-3
OPEN*
1-2
JU1D6
2-3
OPEN*
1-2
JU1D7
2-3
OPEN*
1-2
JU1D8
2-3
OPEN*
1-2
JU1D9
2-3
OPEN*
1-2
JU2D0
2-3*
OPEN
1-2*
JU2D1
2-3
OPEN
1-2
JU2D2
2-3
OPEN*
1-2
JU2D3
2-3
OPEN*
1-2
JU2D4
2-3
OPEN*
DESCRIPTION
Transceiver T2IN connects to Arduino/Mbed connector’s D3 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D3 signal
Arduino/Mbed connector’s D3 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D4 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D4 signal
Arduino/Mbed connector’s D4 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D5 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D5 signal
Arduino/Mbed connector’s D5 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D6 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D6 signal
Arduino/Mbed connector’s D6 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D7 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D7 signal
Arduino/Mbed connector’s D7 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D8 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D8 signal
Arduino/Mbed connector’s D8 signal is not connected
Transceiver T2IN connects to Arduino/Mbed connector’s D9 signal
Transceiver R2OUT connects to Arduino/Mbed connector’s D9 signal
Arduino/Mbed connector’s D9 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D0 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D0 signal
Arduino/Mbed connector’s D0 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D1 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D1 signal
Arduino/Mbed connector’s D1 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D2 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D2 signal
Arduino/Mbed connector’s D2 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D3 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D3 signal
Arduino/Mbed connector’s D3 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D4 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D4 signal
Arduino/Mbed connector’s D4 signal is not connected
www.maximintegrated.com
Maxim Integrated │
3
MAX33250E Shield
Evaluates: MAX33250E
Table 1. Jumper Settings (continued)
JUMPER
SHUNT
POSITION
1-2
JU2D5
2-3
OPEN*
1-2
JU2D6
2-3
OPEN*
1-2
JU2D7
2-3
OPEN*
1-2
JU2D8
2-3
OPEN*
1-2
JU2D9
*Default
position.
2-3
OPEN*
DESCRIPTION
Transceiver T1IN connects to Arduino/Mbed connector’s D5 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D5 signal
Arduino/Mbed connector’s D5 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D6 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D6 signal
Arduino/Mbed connector’s D6 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D7 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D7 signal
Arduino/Mbed connector’s D7 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D8 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D8 signal
Arduino/Mbed connector’s D8 signal is not connected
Transceiver T1IN connects to Arduino/Mbed connector’s D9 signal
Transceiver R1OUT connects to Arduino/Mbed connector’s D9 signal
Arduino/Mbed connector’s D9 signal is not connected
Ordering Information
PART
MAX33250ESHLD#
#Denotes
RoHS compliant.
TYPE
SHIELD
www.maximintegrated.com
Maxim Integrated │
4
MAX33250E Shield
Evaluates: MAX33250E
MAX33250E Shield Bill of Materials
ITEM
1
2
3
4
5
6
7
8
9
10
REF_DES
C1, C2
C3-C7
C8
D1, D2
D3
GNDA, GNDB
J3, J6
J4
J5
JU1
JU1D0-JU1D3, JU1D6-
JU1D9, JU2, JU2D0-JU2D3,
JU2D6-JU2D9
JU3-JU6
P1
R1IN, R1OUT, R2IN,
R2OUT, T1IN, T1OUT,
T2IN, T2OUT
QTY
2
5
1
2
1
2
2
1
1
1
VALUE
10UF
0.1UF
0.33UF
MBR0520L
5.1V
N/A
SSQ-108-04-G-S
SSQ-106-04-G-S
SSQ-110-04-G-S
PEC04SAAN
DESCRIPTION
CAPACITOR; SMT (0603); CERAMIC CHIP; 10UF; 10V; TOL=10%;
MODEL=; TG=-55 DEGC TO +85 DEGC; TC=X5R
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 10V;
TOL=10%; MODEL=C0603 SERIES; TG=-55 DEGC TO +125
DEGC; TC=X7R
CAPACITOR; SMT (0603); CERAMIC CHIP; 0.33uF; 16V;
TOL=10%; MODEL=; TG=-55 DEGC TO +125 DEGC; TC=X7R
DIODE, SCHOTTKY, SOD-123, PIV=20V, Vf=0.385V@If=0.5A,
If(ave)=0.5A
DIODE; ZNR; SMT (SOD-123); VZ=5.1V; IZ=0.02A
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.35IN; BOARD
HOLE=0.063IN; BLACK; PHOSPHOR BRONZE WIRE SILVER
PLATE FINISH;
CONNECTOR; FEMALE; THROUGH HOLE; .025IN SQ POST
SOCKET; STRAIGHT; 8PINS ;
CONNECTOR; FEMALE; THROUGH HOLE; .025IN SQ POST
SOCKET; STRAIGHT; 6PINS ;
CONNECTOR; FEMALE; THROUGH HOLE; .025IN SQ POST
SOCKET; STRAIGHT; 10PINS ;
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT; 4PINS
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT; 3PINS
EVKIT PART-CONNECTOR; MALE; THROUGH HOLE;
BREAKAWAY; STRAIGHT; 2PINS; -65 DEGC TO +125 DEGC;
CONNECTOR; FEMALE; THROUGH HOLE; D-SUBMINIATURE
CONNECTOR; RIGHT ANGLE; 9PINS
TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN; BOARD
HOLE=0.04IN; YELLOW; PHOSPHOR BRONZE WIRE SILVER
PLATE FINISH;
SWITCH; 4PDT; THROUGH HOLE; STRAIGHT; +5V TO +30V;
0.01A-0.3A; MFS SERIES; RCONTACT=0.02 OHM;
RINSULATION=100M OHM
TRANSFORMER; SMT; 1:1:1:1; PCMCIA DC/DC CONVERTER
EVKIT PART-IC; MAX33250E; LGA12; 6X6MM; 1MM PITCH;
PACKAGE OUTLINE DRAWING: 21-100222; PACKAGE CODE:
L1266M+1
IC; ISO; SIX-CHANNEL DIGITAL ISOLATOR; QSOP16
IC; DRV; ISOLATED TRANSFORMER DRIVER; UMAX8
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.35IN; BOARD
HOLE=0.063IN; RED; PHOSPHOR BRONZE WIRE SILVER PLATE
FINISH;
PCB:MAX33250_SHIELD_APPS_A
RESISTOR; 0603; OPEN; FORMFACTOR
CAPACITOR; SMT (0603); OPEN; FORMFACTOR
MFG PART #
C1608X5R1A106K
C0603C104K8RAC
C0603C334K4RAC
MBR0520L
MMSZ5231B-7-F
5006
SSQ-108-04-G-S
SSQ-106-04-G-S
SSQ-110-04-G-S
PEC04SAAN
MANUFACTURER
TDK
KEMET
KEMET
FAIRCHILD
SEMICONDUCTOR
DIODES INCORPORATED
KEYSTONE
SAMTEC
SAMTEC
SAMTEC
SULLINS ELECTRONICS
CORP.
11
17
PEC03SAAN
PEC03SAAN
SULLINS
12
13
4
1
PBC02SAAN
182-009-213R531
PBC02SAAN
182-009-213R531
SULLINS ELECTRONICS
CORP.
NORCOMP
14
8
N/A
5004
KEYSTONE
15
16
17
18
19
20
21
22
23
SW1
T1
U1
U2
U3
VCCA_EXT, VCCB_EXT
PCB
R1, R2
C9, C10
1
1
1
1
1
2
1
0
0
MFS401N-2-Z
TGM-050P3RL
MAX33250E
MAX14850AEE+
MAX845EUA+
N/A
PCB
DNP
DNP
MFS401N-2-Z
TGM-050P3RL
MAX33250E
MAX14850AEE+
MAX845EUA+
5005
MAX33250_SHIELD_APPS_
A
N/A
N/A
NIDEC COPAL
ELECTRONICS CORP
HALO ELECTRONICS INC
MAXIM
MAXIM
MAXIM
KEYSTONE
MAXIM
N/A
N/A
www.maximintegrated.com
Maxim Integrated │
5
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