19-0803; Rev 0; 4/07
MAX3161E Evaluation Kit
General Description
The MAX3161E evaluation kit (EV kit) circuit demon-
strates the RS-232/RS-485/RS-422 multiprotocol trans-
ceivers using the MAX3161E IC. The circuit can be
configured to operate as a dual transceiver in RS-232
mode or as a single transceiver in RS-485/RS-422
mode. The MAX3161E RS-232 data rates can reach
1Mbps, while RS-485/RS-422 data rates can reach
10Mbps. The configurable slew-rate limiting feature
reduces data rates for either protocol to achieve
reduced EMI.
In RS-485/RS-422 mode, the EV kit demonstrates full-
duplex or half-duplex communication. The MAX3161E
drivers feature short-circuit and thermal protection as
well as fail-safe circuitry for open, shorted, or uncon-
nected RS-485/RS-422 receiver inputs. The MAX3161E
EV kit operates from a single 3V to 5.5VDC supply
capable of providing 100mA.
o
3V to 5.5V Single-Supply Operation
o
Configurable Multiprotocol Operation:
2Tx/2Rx RS-232 Transceivers
Single RS-485/RS-422 Transceiver
o
10Mbps RS-485/RS-422 Data Rates and 1Mbps
RS-232 Data Rates
o
Configurable RS-232/RS-485 Transmitter Slew
Rates
o
Configurable Full-Duplex/Half-Duplex RS-485/
RS-422 Operation
o
Fully Assembled and Tested
Features
Evaluates: MAX3161E
Component List
DESIGNATION
C1, C2, C3, C5
QTY
4
PART DESCRIPTION
0.47µF ±10%, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A474K
0.1µF ±10%, 10V X5R ceramic
capacitor (0402)
Murata GRM155R61A104K
10µF ±10%, 10V X5R ceramic
capacitor (0805)
Murata GRM21BR61A106K
DB9 male right-angle connector
5-position terminal block (5mm)
2-pin headers
3-pin headers
100kΩ ±5% resistors (0603)
120Ω ±1% resistors (1206)
MAX3161EEAG+ (24-pin SSOP)
Shunts (JU1–JU10)
PCB: MAX3161E Evaluation Kit+
SUPPLIER
Murata Mfg. Co., Ltd.
PART
MAX3161EEVKIT+
Ordering Information
TEMP RANGE
0°C to +70°C*
IC PACKAGE
24 SSOP
+Denotes
a lead-free and RoHS-compliant EV kit.
*This
limited temperature range applies to the EV kit PCB only.
The MAX3161E IC temperature range is -40°C to +85°C.
C4
1
C6
J1
J2
JU1–JU4, JU9,
JU10
JU5–JU8
R1–R4
R5, R6
U1
—
—
1
1
1
6
4
4
2
1
10
1
Component Supplier
PHONE
770-436-1300
WEBSITE
www.murata.com
Note:
Indicate that you are using the MAX3161E when contacting
this component supplier.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX3161E Evaluation Kit
Evaluates: MAX3161E
Quick Start
Recommended Equipment
•
•
•
3.3V, 0.5A DC power supply
Logic function generator
Oscilloscope
receiver operate in full-duplex or half-duplex mode and
communicate at data rates up to 10Mbps. The
MAX3161E receiver represents a 1/8 unit load on the
RS-485/RS-422 bus. Resistors R5 and R6 provide a
configurable termination for the RS-485/RS-422 bus.
Terminal block J2 eases connection to the RS-485/RS-
422 bus. The DB9 connector J1 is available for interfac-
ing with an RS-232 serial line. See Table 5 and Figures
1, 2, and 3 for the respective signal pins or pads.
Procedure
The MAX3161E EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Verify that shunts are installed across pins 1-2 of
jumpers JU5–JU8 (data communications equipment
(DCE) mode).
2) Verify that a shunt is installed on jumpers JU3
(RS-232 mode) and JU4 (full-duplex mode).
3) Verify that shunts are not installed on jumpers JU1
(MAX3161E enabled), JU2 (fast mode), and JU9 and
JU10 (RS-485/RS-422 differential I/O not terminated).
4) Set the DC power-supply output to 3.3V and disable
the output.
5) Set the logic function generator to a 3.3V
P-P
,
500kHz, 1.65V
DC
offset square wave and disable
the output. Terminate the function generator as
needed.
6) Connect the DC power-supply positive output to the
VCC pad on the EV kit.
7) Connect the supply ground to the GND pad next to
VCC on the EV kit.
8) Connect the logic function generator output to the
DI/T1IN PCB pad and connect ground to the GND
PCB pad.
9) Enable the power-supply output and then the func-
tion generator output.
10) Use the oscilloscope to measure the transmitter out-
put T1OUT at pin 3 of jumper JU5. Verify that the
waveform is a 500kHz square wave and is approxi-
mately ±5V
P-P
.
Jumper Selection
The MAX3161E EV kit utilizes several jumpers to reconfig-
ure circuit features and functionality: IC enable, slew-rate
selection, communication-protocol selection, full-duplex/
half-duplex communication, DTE/DCE connections, and
RS-485/RS-422 differential I/O termination.
Enable
The MAX3161E EV kit features jumper JU1 to enable the
MAX3161E or place the IC in shutdown mode, thus
reducing quiescent current. A
SHDN
PCB pad is also pro-
vided for the shutdown signal to interface with an external
controller. See Table 1 for configuring jumper JU1.
Table 1. MAX3161E Enable (Jumper JU1)
SHUNT
POSITION
Installed
Not installed
SHDN
PIN
EV KIT FUNCTION
Connected to GND MAX3161E shutdown
Connected to VCC
MAX3161E enabled
through resistor R1
Slew-Rate Selection
Jumper JU2 on the EV kit configures the MAX3161E
communication slew-rate mode. Slew-rate limited-mode
operation minimizes EMI radiation, while fast-mode
operation optimizes maximum data rates for either pro-
tocol. See Table 2 for configuring jumper JU2 and refer
to the MAX3161E IC data sheet for more information on
slew-rate configuration.
Table 2. Slew Rate (Jumper JU2)
SHUNT
POSITION
FAST PIN
EV KIT FUNCTION
Slew-rate limited mode.
RS-232/RS-485/RS-422
250kbps maximum data
rate
Fast mode. RS-232 1Mbps
maximum data rate;
RS-485/RS-422 10Mbps
maximum data rate
Detailed Description
The MAX3161E EV kit demonstrates the MAX3161E
RS-232/RS-485/RS-422 multiprotocol transceiver IC.
The EV kit operates from a 3V to 5.5VDC source capa-
ble of supplying 100mA.
The EV kit features jumpers to configure the communi-
cation protocol to RS-232 operation or RS-485/RS-422
operation. In RS-232 mode operation, the MAX3161E
communicates at data rates up to 1Mbps. In RS-485/
RS-422 mode operation, the differential driver and
2
Installed
Connected to
GND
Not installed
Connected to
VCC through
resistor R2
_______________________________________________________________________________________
MAX3161E Evaluation Kit
RS-232/RS-485/RS-422 Protocol Selection
EV kit jumper JU3 sets the communication protocol to
either RS-232 or RS-485/RS-422. See Table 3 for
configuring jumper JU3. For additional protocol-config-
uration information, refer to the
Functional Diagrams
section of the MAX3161E IC data sheet.
RS-485/RS-422 Communication Mode
EV kit jumper JU4 configures the MAX3161E IC’s RS-485/
RS-422 communication mode to full duplex or half
duplex. To receive RS-485 data, disable the RS-485
outputs by driving the DE485/T2IN PCB pad low. See
Table 4 to configure jumper JU4 for the desired mode
of communication.
Header J2 is labeled for full-duplex RS-485/RS-422
communication; however, the driver outputs (Y and Z)
are multiplexed with the receiver inputs (A and B) dur-
ing half-duplex communication. Refer to the
Half-
Duplex RS-485/RS-422 Operation
and
MAX3161E
Functional Diagram
sections of the MAX3161E IC data
sheet for further details.
DTE/DCE Connections
The EV kit features jumpers JU5, JU6, JU7, and JU8 to
configure the RS-232 connector J1 as a data terminal
equipment (DTE) or as a data communications equip-
ment (DCE) connector. See Table 5 for configuring the
respective jumpers for DTE or DCE connection mode.
RS-485/RS-422 Termination
EV kit jumpers JU9 and JU10 configure the RS-485/RS-
422 termination. JU9 sets the input termination with
resistor R6. JU10 sets the output termination with resistor
R5. See Table 6 for the RS-485/RS-422 termination
options.
Evaluates: MAX3161E
EV Kit I/O Connections
The MAX3161E EV kit features PCB pads for interfacing
with logic signals and DB9 connector J1 to interface
with an RS-232 serial line. Terminal block J2 eases con-
nection to an RS-485/RS-422 bus. See Figures 1 or 2 for
RS-232 or RS-485/RS-422 transceiver functional modes.
The RS-232/RS-485/RS-422 input range is ±25V and
the output range is ±5V.
Table 3. RS-232/RS-485/RS-422 Protocol
(Jumper JU3)
SHUNT POSITION
Installed
Not installed
RS-485/RS-232
PIN
EV KIT FUNCTION
Table 4. Communication Mode
(Jumper JU4)
SHUNT POSITION
Installed
Not installed
HDPLX PIN
RS-485/RS-422
MODE
Connected to GND RS-232 mode
Connected to VCC RS-485/RS-422
through resistor R3 mode
Connected to GND Full-duplex mode
Connected to VCC
Half-duplex mode
through resistor R4
Table 5. DTE/DCE Modes (Jumpers JU5–JU8)
JU5
SHUNT POSITION
J1 PIN 2
CONNECTED TO
R1IN
T1OUT
JU6
J1 PIN 3
CONNECTED TO
T1OUT
R1IN
JU7
J1 PIN 7
CONNECTED TO
T2OUT
R2IN
JU8
J1 PIN 8
CONNECTED TO
R2IN
T2OUT
J1 CONNECTION
MODE
1-2
2-3
DCE
DTE
Table 6. RS-485/RS-422 Termination (Jumpers JU9 and JU10)
SHUNT POSITION
Installed
Not installed
JU9
RS-485 INPUT
A connected to B through
resistor R6
Not connected
JU10
RS-485 OUTPUT
Y connected to Z through
resistor R5
Not connected
TERMINATION VALUE
120Ω termination
—
_______________________________________________________________________________________
3
MAX3161E Evaluation Kit
Evaluates: MAX3161E
LOGIC LEVEL I/O
DI/T1IN
T1
DE485/T2IN
T2
R1OUT
R1
RO/R2OUT
R2
MAX3161EEVKIT+
U1
T1IN
T1OUT
J1*
T1OUT
T2OUT
T2OUT
R1IN
R2IN
R2IN
RS-232 LEVEL I/O
T2IN
R1OUT
R1IN
R2OUT
*SEE TABLE 5 FOR J1 PINOUT
Figure 1. MAX3161E EV Kit I/O Function in RS-232 Mode
LOGIC LEVEL I/O
DE485
DE485/T2IN
MAX3161EEVKIT+
U1
J2
Y
Z(B)
B
R
A
Z
B
RS-485/RS-422
LEVEL I/O
DI
DI/T1IN
D
Y(A)
Y
Z
B
A
RO
RO/R2OUT
A
Figure 2. MAX3161E EV Kit I/O Function in RS-485/RS-422 Mode (Full Duplex)
4
_______________________________________________________________________________________
MAX3161E Evaluation Kit
Evaluates: MAX3161E
VCC
VCC
2
1
C6
10µF
C1
0.47µF
C4
0.1µF
3
4
V
CC
C1+
C1-
U1
GND
MAX3161E
Y(A)
V-
V+
C2+
C2-
24
23
22
21
7
C2
0.47µF
C5
0.47µF
C3
0.47µF
GND
J2
RS-485
Y
R5
120Ω
1%
J2-1
JU10
LOGIC LEVEL
GND
DI/T1IN
DE485/T2IN
R1OUT
R0/R2OUT
GND
20
19
9
10
DI/T1IN
DE485/T2IN
R1OUT
R0/R2OUT
T1OUT
T2OUT
5
8
R1IN
R1IN
RS-485/RS-232
R2IN
HDPLX
18
3
17
R21N
JU6
21
15
T1OUT
3 2 1
JU5
Z(B)
B
6
16
Z
J2-2
J2-3
B
R6
120Ω
1%
JU9
A
GND
J2-4
J2-5
A
R1IN
JU7
1 2 3
32
T1OUT
1
JU8
R2IN
6
J1
RS-232
1
2
7
3
8
4
9
5
11
10
SHDN
11
SHDN
R1
100kΩ
JU1
JU2
VCC
FAST
12
13
14
JU5–JU8
R2 VCC
100kΩ
R3 VCC
100kΩ
DCE: 1-2
DTE: 2-3
JU3
JU4
R4 VCC
100kΩ
Figure 3. MAX3161E EV Kit Schematic
_______________________________________________________________________________________
5
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