MAX149X1EVKIT#

MAX149X1 Evaluation Kit General Description The MAX149X1 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the functionality of the MAX14938 isolated RS-485/Profibus™ transceiver. The EV kit operates from a single 3.3V supply and features an on-board isolated power supply to power the secondaryside of the circuit. The MAX149X1 EV kit can also be used to evaluate the MAX14939, MAX14941, MAX14942, MAX14945, and MAX14948. Features ●● Operates From a Single 3.3V Supply ●● Terminal Block Connectors for Easy RS-485/Profibus Evaluation ●● 2750VRMS Isolation for 60s ●● Fully Assembled and Tested Quick Start Required Equipment ●● MAX149X1 EV kit ●● 3.3V, 1A DC power supply ●● Signal/function generator ●● Oscilloscope Ordering Information appears at end of data sheet. The PROFIBUS-DP logo is a registered trademark of PROFIBUS and PROFINET International (PI). 19-8391; Rev 1; 7/16 Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 Startup Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. 1) Set the DC power supply to 3.3V and connect the DC power supply between the EV kits VDDA and GNDA connectors. 2) Ensure that all jumpers are in their default positions (see Table 1). 3) Turn on the power supply. 4) Set the signal/function generator to output a 100kHz 0-to-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. 5) Connect the signal/function generator to the TXD test point. 6) Using the oscilloscope, verify that the A and B outputs switch as the signal toggles. Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 Evaluation Kit Detailed Description of Hardware Evaluating the Isolated RS-485 Interface The EV kit is a fully assembled and tested circuit board for evaluating the MAX14938 isolated RS-485/Profibus transceiver (U2). The EV kit has been designed to allow for evaluating the MAX14938 alone or in a standard RS-485 configuration. The EV kit is powered from a single 3.3V power supply. Driver and Receiver Enable Selection Powering the Board Resistors R2–R4 Configuration The power on the EV kit is derived from a single 3.3V source. Connect an external supply from GNDA to either the VDDA test point or P1 connector to supply the 3.3V to the logic-side (A) of the circuit. An on-board MAX258 transformer driver (U1) and external transformer (TX1) generate an isolated supply for powering the (B) isolated-side of the board. To disable the MAX258 circuit, connect jumper J1 to 2-3. To disconnect the output of the transformer circuit from the MAX14938 LDO input, remove the shunt on J5. The EV kit features three jumpers (J2, J3, and J4) to enable/disable the driver and receiver outputs. Set J2 to 2-3 to enable the receiver. Set J3 to 1-2 to enable the driver. To actively control both enables, open J2 and J3 and close J4, which connects DE and RE together. For end-of-the-line transceivers, close J6 to connect a 120Ω resistor (R3) between the A and B RS-485 I/Os on the MAX14938. 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 will vary with the application. Pads are provided for pullup (R2) and pulldown (R4) resistors for the A-B lines, although the use of these resistors is purely optional. Note that the MAX14938 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. Table 1. Jumper Table (J1-J6) JUMPER J1 J2 J3 J4 SHUNT POSITION 1-2 MAX258 transformer driver is disabled. 2-3* MAX258 transformer driver is enabled. 1-2* RE is high. The RS-485 receiver is disabled. 2-3 RE is low. The RS-485 receiver is enabled. 1-2* DE is high. The RS-485 driver outputs are enabled. 2-3 DE is low. The RS-485 driver outputs are disabled. Open* DE and RE are not connected together. Closed DE and RE are connected together. Open J5 DESCRIPTION Closed* Output of the transformer circuit is not connected to VLDO. Output of the transformer circuit is connected to VLDO and powers the B-side of the MAX14938. *Default position. www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 Evaluation Kit Ordering Information PART TYPE MAX149X1EVKIT# EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated │  3 Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 Evaluation Kit MAX149X1 Bill of Materials ITEM REF_DES DNI 1 C1, C3, C6, C8 - 2 C2, C7 QTY MFG PART # MANUFACTURER VALUE MURATA 1UF DESCRIPTION COMMENTS CAPACITOR; SMT (0603); CERAMIC CHIP; 1UF; 25V; TOL=10%; MODEL=GRM SERIES; TG=-55 DEGC TO +125 DEGC; TC=X7R CAPACITOR; SMT (0603); CERAMIC CHIP; 0.1UF; 16V; TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R; CAPACITOR; SMT (0805); CERAMIC CHIP; 10UF; 25V; TOL=10%; MODEL=; TG=-55 DEGC TO +125 DEGC; TC=X5R CAPACITOR; SMT; 0603; CERAMIC; 0.1uF; 25V; 10%; X7R; -55degC to + 125degC; +/-15% from -55degC to +125degC; - 4 GRM188R71E105KA12D; CGA3E1X7R1E105K C0603C104K4RAC; GCM188R71C104KA37; C1608X7R1C104K; GRM188R71C104K; 2 C0603X7R160-104KNE KEMET/MURATA/TDK/ VENKEL LTD. 0.1UF 3 C4, C9 - GRM21BR61E106K; C2012X5R1E106K125AB; 2 C2012X5R1E106K MURATA/TDK 4 C5 - C0603C104K3RAC; GRM188R71E104KA01; 1 C1608X7R1E104K KEMET/MURATA/TDK 0.1UF 5 D1, D2 - 2 MBR0520 GENERIC PART MBR0520 6 J1-J3 - 3 PEC03SAAN SULLINS PEC03SAAN 7 J4-J6 - 3 PEC02SAAN SULLINS PEC02SAAN 8 P1 - 1 1935161 PHOENIX CONTACT 1935161 9 P2, P3 - 2 1935200 PHOENIX CONTACT 1935200 - 1 CRCW0603120RJN 10 R3 11 SU1-SU4 - 4 STC02SYAN 12 T1, T9, T10 - 3 13 T2-T6, T11-T13 - 8 14 T7, T8, T14, T15 - 4 15 TX1 - 1 TGMS-1464V6LF 16 U1 - 1 MAX258ATA+ 17 U2 18 R1, R2, R4 DNP www.maximintegrated.com 1 MAX14938GWE+ 3 N/A VISHAY DALE 10UF 120 DIODE; SCH; SCHOTTKY RECTIFIER; SMT (SOD-123); PIV=20V; IF=0.5A; -55 DEGC TO +150 DEGC CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 3PINS CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 2PINS CONNECTOR; FEMALE; THROUGH HOLE; GREEN TERMINAL BLOCK; STRAIGHT; 2PINS CONNECTOR; FEMALE; THROUGH HOLE; GREEN TERMINAL BLOCK; STRAIGHT; 6PINS RESISTOR; 0603; 120 OHM; 5%; 200PPM; 0.10W; THICK FILM TEST POINT; JUMPER; STR; TOTAL LENGTH=0.256IN; SULLINS ELECTRONICS BLACK; INSULATION=PBT CONTACT=PHOSPHOR CORP. STC02SYAN BRONZE; COPPER PLATED TIN OVERALL TESTPOINT WITH 1.80MM HOLE DIA, RED, 5010 ? 5010 MULTIPURPOSE 5014 ? 5011 ? HALO ELECTRONICS, INC TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; YELLOW; 5014 PHOSPHOR BRONZE WIRE SILVER PLATE FINISH; TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK; 5011 PHOSPHOR BRONZE WIRE SILVER PLATE FINISH; TGMSTRANSFORMER; SMT; 1:2.4; POWER 1464V6LF TRANSFORMER; DRAFT DATASHEET ONLY MAXIM MAX258ATA IC; DRV; 0.5A; PUSH-PULL TRANSFORMER DRIVER + FOR ISOLATED POWER SUPPLY; TDFN8-EP 2X3 MAXIM N/A EVKIT PART-IC; PACKAGE CODE: W16M+10; OUTLINE DRAWING NO.: 21-0042; LAND PATTERN DRAWING NO.: 90-0107; WSOIC16 300MIL PACKAGE OUTLINE 0603 RESISTOR - EVKIT MAX14938 OPEN Maxim Integrated │  4 Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 Evaluation Kit MAX149X1 Schematics 8 7 6 5 4 3 2 1 VLDO VDDA C1 1UF D 2 4 VDDA VDDA 3 3 VDDA T1 U1 MAX258ATA+ VDD /EN T1 HICLK 1 2 8 T2 6 PGND EP 7 9 TX1 TGMS-1464V6LF VDDA C4 10UF RXD C 6 6 2 2 5 5 3 3 4 J5 D1 1 4 VDDB 2 A C3 1UF RE RXD RE DE TXD PV OR /SBA 1 J2 IN RE IN DE IN 2 T3 J4 3 IN IN IN IN IN RXD DE TXD 3 4 RXD 5 6 DE 7 PV /RE TXD 2 8 D A IN VDDB 11 16 A 12 VLDO B 13 N.C. 14 10 GNDA GNDB GNDA GNDB C6 1UF VDDB C7 0.1UF C8 1UF B VDDB B IN T12 DEM OR N.C. R2 OPEN DEM OR N.C. IN T13 C J6 9 15 IN A IN B IN DEM OR N.C. VDDB R3 120 6 5 4 3 2 1 R4 OPEN P3 B IN 1 J3 C5 0.1UF DEM B VDDA VDDA T9 VDDB T11 5 C2 0.1UF 1 VLDO T10 C9 10UF D2 U2 MAX14938GWE+ VDDA VDDA 1 2 3 4 5 6 1 VLDO T2 P2 1 VLDO GND GND 2 P1 1 J1 1 VDDA R1 OPEN 2 3 T4 T7 T5 PV OR /SBA T8 A T14 TXD GNDA PV OR /SBA GNDB IN T15 T6 A PROJECT TITLE: MAX149X1 EVKIT DRAWING TITLE: SIZE DATE: HARDWARE NUMBER: B _ ENGINEER: _ 03/31/2015 DRAWN BY: REV: _ TEMPLATE REV: 1.5 8 www.maximintegrated.com 7 6 5 4 3 2 A SHEET 1 OF 1 1 Maxim Integrated │  5 MAX149X1 Evaluation Kit Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 PCB Layout www.maximintegrated.com Maxim Integrated │  6 MAX149X1 Evaluation Kit Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 PCB Layout (continued) www.maximintegrated.com Maxim Integrated │  7 MAX149X1 Evaluation Kit Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 MAX149X1 PCB Layout (continued) www.maximintegrated.com Maxim Integrated │  8 MAX149X1 Evaluation Kit Evaluates: MAX14938/MAX14939/ MAX14941/MAX14942/ MAX14945/MAX14948 Revision History REVISION NUMBER REVISION DATE 0 2/16 Initial release 1 7/16 Added MAX14939 and MAX14948 DESCRIPTION PAGES CHANGED — 1–9 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc. │  9