19-0803; Rev 0; 4/07 MAX3161E Evaluation Kit The MAX3161E evaluation kit (EV kit) circuit demonstrates the RS-232/RS-485/RS-422 multiprotocol transceivers 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 fullduplex or half-duplex communication. The MAX3161E drivers feature short-circuit and thermal protection as well as fail-safe circuitry for open, shorted, or unconnected RS-485/RS-422 receiver inputs. The MAX3161E EV kit operates from a single 3V to 5.5VDC supply capable of providing 100mA. Features 3V to 5.5V Single-Supply Operation Configurable Multiprotocol Operation: 2Tx/2Rx RS-232 Transceivers Single RS-485/RS-422 Transceiver 10Mbps RS-485/RS-422 Data Rates and 1Mbps RS-232 Data Rates Configurable RS-232/RS-485 Transmitter Slew Rates Configurable Full-Duplex/Half-Duplex RS-485/ RS-422 Operation Fully Assembled and Tested Ordering Information Component List DESIGNATION QTY PART DESCRIPTION C1, C2, C3, C5 4 0.47F 10%, 10V X5R ceramic capacitors (0603) Murata GRM188R61A474K C4 1 0.1F 10%, 10V X5R ceramic capacitor (0402) Murata GRM155R61A104K C6 1 10F 10%, 10V X5R ceramic capacitor (0805) Murata GRM21BR61A106K J1 1 DB9 male right-angle connector J2 1 5-position terminal block (5mm) JU1-JU4, JU9, JU10 6 2-pin headers JU5-JU8 4 3-pin headers R1-R4 4 100k 5% resistors (0603) R5, R6 2 120 1% resistors (1206) U1 1 MAX3161EEAG+ (24-pin SSOP) -- 10 Shunts (JU1-JU10) -- 1 PCB: MAX3161E Evaluation Kit+ PART TEMP RANGE IC PACKAGE MAX3161EEVKIT+ 0C to +70C* 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 -40C to +85C. Component Supplier SUPPLIER PHONE Murata Mfg. Co., Ltd. 770-436-1300 WEBSITE www.murata.com Note: Indicate that you are using the MAX3161E when contacting this component supplier. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX3161E General Description Evaluates: MAX3161E MAX3161E Evaluation Kit Quick Start Recommended Equipment * 3.3V, 0.5A DC power supply * Logic function generator * Oscilloscope 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, 1.65VDC 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 function generator output. 10) Use the oscilloscope to measure the transmitter output T1OUT at pin 3 of jumper JU5. Verify that the waveform is a 500kHz square wave and is approximately 5VP-P. 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 capable of supplying 100mA. The EV kit features jumpers to configure the communication 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 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/RS422 bus. The DB9 connector J1 is available for interfacing with an RS-232 serial line. See Table 5 and Figures 1, 2, and 3 for the respective signal pins or pads. Jumper Selection The MAX3161E EV kit utilizes several jumpers to reconfigure 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 provided 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 protocol. 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 Installed Connected to GND Slew-rate limited mode. RS-232/RS-485/RS-422 250kbps maximum data rate Not installed Connected to VCC through resistor R2 Fast mode. RS-232 1Mbps maximum data rate; RS-485/RS-422 10Mbps maximum data rate EV KIT FUNCTION _______________________________________________________________________________________ MAX3161E Evaluation Kit 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 equipment (DCE) connector. See Table 5 for configuring the respective jumpers for DTE or DCE connection mode. 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) during half-duplex communication. Refer to the HalfDuplex RS-485/RS-422 Operation and MAX3161E Functional Diagram sections of the MAX3161E IC data sheet for further details. RS-485/RS-422 Termination EV kit jumpers JU9 and JU10 configure the RS-485/RS422 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. Table 3. RS-232/RS-485/RS-422 Protocol (Jumper JU3) Table 4. Communication Mode (Jumper JU4) RS-485/RS-232 PIN SHUNT POSITION Installed EV KIT FUNCTION Connected to GND RS-232 mode Connected to VCC RS-485/RS-422 through resistor R3 mode Not installed 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 connection 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. SHUNT POSITION RS-485/RS-422 MODE HDPLX PIN Installed Connected to GND Full-duplex mode Not installed Connected to VCC Half-duplex mode through resistor R4 Table 5. DTE/DCE Modes (Jumpers JU5-JU8) JU5 JU6 JU7 JU8 SHUNT POSITION J1 PIN 2 CONNECTED TO J1 PIN 3 CONNECTED TO J1 PIN 7 CONNECTED TO J1 PIN 8 CONNECTED TO 1-2 R1IN T1OUT T2OUT R2IN DCE 2-3 T1OUT R1IN R2IN T2OUT DTE J1 CONNECTION MODE Table 6. RS-485/RS-422 Termination (Jumpers JU9 and JU10) JU9 JU10 RS-485 INPUT RS-485 OUTPUT Installed A connected to B through resistor R6 Y connected to Z through resistor R5 120 termination Not installed Not connected Not connected -- SHUNT POSITION TERMINATION VALUE _______________________________________________________________________________________ 3 Evaluates: MAX3161E 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-configuration information, refer to the Functional Diagrams section of the MAX3161E IC data sheet. Evaluates: MAX3161E MAX3161E Evaluation Kit RS-232 LEVEL I/O MAX3161EEVKIT+ LOGIC LEVEL I/O U1 T1IN T2IN R1OUT R2OUT DI/T1IN J1* T1OUT T1 T1OUT DE485/T2IN T2OUT T2 R1OUT T2OUT R1IN R1IN R1 R2IN RO/R2OUT R2IN R2 *SEE TABLE 5 FOR J1 PINOUT Figure 1. MAX3161E EV Kit I/O Function in RS-232 Mode LOGIC LEVEL I/O DE485 DI U1 DE485/T2IN J2 Y(A) DI/T1IN D Z(B) RO RS-485/RS-422 LEVEL I/O MAX3161EEVKIT+ B RO/R2OUT Y Y Z Z B B A A R A Figure 2. MAX3161E EV Kit I/O Function in RS-485/RS-422 Mode (Full Duplex) 4 _______________________________________________________________________________________ MAX3161E Evaluation Kit 2 VCC 1 C6 10F C1 0.47F C4 0.1F 3 4 GND C2 0.47F VCC V+ C1+ C2+ C1- C2U1 GND VMAX3161E Y(A) LOGIC LEVEL Z(B) GND B 20 DI/T1IN 19 DE485/T2IN 9 R1OUT 10 R0/R2OUT 24 23 22 DE485/T2IN A C5 0.47F C3 0.47F J2 RS-485 21 7 Y JU10 R5 120 1% JU9 R6 120 1% 16 B T1OUT R0/R2OUT GND 3 2 1 5 J2-3 J2-4 J2-5 J1 RS-232 R1IN JU5 JU7 1 2 3 8 R1IN 12 13 R2IN JU6 18 3 17 21 32 1 JU8 T1OUT 1 R2IN 6 2 7 3 8 4 9 R21N 5 HDPLX RS-485/RS-232 FAST R1IN SHDN A 15 R1OUT 11 J2-2 T1OUT GND R1 100k Z J2-1 6 DI/T1IN T2OUT SHDN Evaluates: MAX3161E VCC 11 10 14 VCC JU5-JU8 JU1 JU2 JU3 JU4 R2 VCC 100k R3 VCC 100k DCE: 1-2 DTE: 2-3 R4 VCC 100k Figure 3. MAX3161E EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX3161E MAX3161E Evaluation Kit Figure 4. MAX3161E EV Kit Component Placement Guide-- Component Side 6 Figure 5. MAX3161E EV Kit PCB Layout--Component Side _______________________________________________________________________________________ MAX3161E Evaluation Kit Evaluates: MAX3161E Figure 6. MAX3161E EV Kit PCB Layout--Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2007 Maxim Integrated Products CARDENAS is a registered trademark of Maxim Integrated Products, Inc.