Evaluates: MAX3161E 19-0803 Rev 0 4/07 MAX3161E Evaluation Kit General Description Features The MAX3161E evaluation kit (EV kit) circuit demon- 3V to 5.5V Single-Supply Operation strates the RS-232/RS-485/RS-422 multiprotocol trans- Configurable Multiprotocol Operation: ceivers using the MAX3161E IC. The circuit can be 2Tx/2Rx RS-232 Transceivers configured to operate as a dual transceiver in RS-232 Single RS-485/RS-422 Transceiver mode or as a single transceiver in RS-485/RS-422 mode. The MAX3161E RS-232 data rates can reach 10Mbps RS-485/RS-422 Data Rates and 1Mbps 1Mbps, while RS-485/RS-422 data rates can reach RS-232 Data Rates 10Mbps. The configurable slew-rate limiting feature Configurable RS-232/RS-485 Transmitter Slew reduces data rates for either protocol to achieve reduced EMI. Rates In RS-485/RS-422 mode, the EV kit demonstrates full- Configurable Full-Duplex/Half-Duplex RS-485/ duplex or half-duplex communication. The MAX3161E RS-422 Operation drivers feature short-circuit and thermal protection as Fully Assembled and Tested 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. Component List Ordering Information PART TEMP RANGE IC PACKAGE DESIGNATION QTY PART DESCRIPTION MAX3161EEVKIT+ 0C to +70C* 24 SSOP 0.47F 10%, 10V X5R ceramic +Denotes a lead-free and RoHS-compliant EV kit. C1, C2, C3, C5 4 capacitors (0603) *This limited temperature range applies to the EV kit PCB only. Murata GRM188R61A474K The MAX3161E IC temperature range is -40C to +85C. 0.1F 10%, 10V X5R ceramic C4 1 capacitor (0402) Murata GRM155R61A104K 10F 10%, 10V X5R ceramic C6 1 capacitor (0805) Murata GRM21BR61A106K J1 1 DB9 male right-angle connector J2 1 5-position terminal block (5mm) JU1JU4, JU9, Component Supplier 6 2-pin headers JU10 SUPPLIER PHONE WEBSITE JU5JU8 4 3-pin headers Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com R1R4 4 100k 5% resistors (0603) Note: Indicate that you are using the MAX3161E when contacting R5, R6 2 120 1% resistors (1206) this component supplier. U1 1 MAX3161EEAG+ (24-pin SSOP) 10 Shunts (JU1JU10) 1 PCB: MAX3161E Evaluation Kit+ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX3161E Evaluation Kit receiver operate in full-duplex or half-duplex mode and Quick Start communicate at data rates up to 10Mbps. The Recommended Equipment MAX3161E receiver represents a 1/8 unit load on the 3.3V, 0.5A DC power supply RS-485/RS-422 bus. Resistors R5 and R6 provide a configurable termination for the RS-485/RS-422 bus. Logic function generator Terminal block J2 eases connection to the RS-485/RS- Oscilloscope 422 bus. The DB9 connector J1 is available for interfac- Procedure ing with an RS-232 serial line. See Table 5 and Figures The MAX3161E EV kit is fully assembled and tested. 1, 2, and 3 for the respective signal pins or pads. Follow the steps below to verify board operation. Jumper Selection Caution: Do not turn on the power supply until all The MAX3161E EV kit utilizes several jumpers to reconfig- connections are completed. ure circuit features and functionality: IC enable, slew-rate 1) Verify that shunts are installed across pins 1-2 of selection, communication-protocol selection, full-duplex/ jumpers JU5JU8 (data communications equipment half-duplex communication, DTE/DCE connections, and (DCE) mode). RS-485/RS-422 differential I/O termination. 2) Verify that a shunt is installed on jumpers JU3 Enable (RS-232 mode) and JU4 (full-duplex mode). The MAX3161E EV kit features jumper JU1 to enable the 3) Verify that shunts are not installed on jumpers JU1 MAX3161E or place the IC in shutdown mode, thus (MAX3161E enabled), JU2 (fast mode), and JU9 and reducing quiescent current. A SHDN PCB pad is also pro- JU10 (RS-485/RS-422 differential I/O not terminated). vided for the shutdown signal to interface with an external 4) Set the DC power-supply output to 3.3V and disable controller. See Table 1 for configuring jumper JU1. the output. Table 1. MAX3161E Enable (Jumper JU1) 5) Set the logic function generator to a 3.3V , P-P 500kHz, 1.65V offset square wave and disable DC SHUNT the output. Terminate the function generator as SHDN PIN EV KIT FUNCTION POSITION needed. Installed Connected to GND MAX3161E shutdown 6) Connect the DC power-supply positive output to the VCC pad on the EV kit. Connected to VCC Not installed MAX3161E enabled through resistor R1 7) Connect the supply ground to the GND pad next to VCC on the EV kit. Slew-Rate Selection 8) Connect the logic function generator output to the Jumper JU2 on the EV kit configures the MAX3161E DI/T1IN PCB pad and connect ground to the GND communication slew-rate mode. Slew-rate limited-mode PCB pad. operation minimizes EMI radiation, while fast-mode 9) Enable the power-supply output and then the func- operation optimizes maximum data rates for either pro- tion generator output. tocol. See Table 2 for configuring jumper JU2 and refer to the MAX3161E IC data sheet for more information on 10) Use the oscilloscope to measure the transmitter out- put T1OUT at pin 3 of jumper JU5. Verify that the slew-rate configuration. waveform is a 500kHz square wave and is approxi- Table 2. Slew Rate (Jumper JU2) mately 5V . P-P SHUNT Detailed Description FAST PIN EV KIT FUNCTION POSITION The MAX3161E EV kit demonstrates the MAX3161E Slew-rate limited mode. RS-232/RS-485/RS-422 multiprotocol transceiver IC. Connected to RS-232/RS-485/RS-422 The EV kit operates from a 3V to 5.5VDC source capa- Installed GND 250kbps maximum data ble of supplying 100mA. rate The EV kit features jumpers to configure the communi- Fast mode. RS-232 1Mbps cation protocol to RS-232 operation or RS-485/RS-422 Connected to maximum data rate operation. In RS-232 mode operation, the MAX3161E Not installed VCC through RS-485/RS-422 10Mbps communicates at data rates up to 1Mbps. In RS-485/ resistor R2 maximum data rate RS-422 mode operation, the differential driver and 2 Evaluates: MAX3161E