TRS3122EEVM

User's Guide SLCU001 – May 2016 TRS3122EEVM User's Guide Abstract This user's guide describes the functional operation of the TRS3122EEVM Evaluation Module (EVM) for use as a design reference as well as a general engineering demonstration for the TRS3122E RS-232 Transceiver. Included in this User's Guide are setup instructions, features, a schematic diagram, an example layout, layout guidelines, and a bill of materials. Introduction The TRS3122EEVM is an evaluation module for the TRS3122E device, a 1.8-V high-speed RS-232 transceiver. The module enables device evaluation using the installed DB9 connector and terminal block. The board interfaces data and control CMOS logic levels on the terminal block to RS-232 levels supporting data [RX, TX] channels and flow control [RTS, CTS] channels on the DB9 connector. TRS3122EEVM Board Features • • • • • • Interface with MCUs or processor from 1.65 V up to 5.5 V High-speed RS-232 communication, up to 1 Mbps Auto-powerdown plus for very low power consumption (1µA) during shutdown Robust IEC61000-4-2 qualification provides robust protection from electrostatic discharge events DB9 female connector for direct connection with a computer's RS-232 port Screw terminals for easy connection for all power and logic signals SLCU001 – May 2016 Submit Documentation Feedback TRS3122EEVM User's Guide Copyright © 2016, Texas Instruments Incorporated 1 www.ti.com Applications Any application that needs short range point to point full duplex data communications with hardware flow control. • • • • Remote Radio Unit (RRU) Base Band Unit (BBU) Electronic Point of Sale (EPOS) Diagnostics & Data Transmission Battery-Powered Equipment Setup The VCC screw terminal point needs to be supplied with external power; 1.8 V or 3.3 V is recommended. The VL screw terminal point needs to be supplied with external power; 1.8 V to VCC is recommended. The GND screw terminal point is the ground connection for the TRS3122EEVM. The DB9 connector mates with a personal computer's RS-232 port or a USB to RS-232 adapter. For initial testing, external wires can be added to screw terminals; CTS2 to RTS2 and TX2 to RX2 to loop back the signal. The ideal usage involves connecting the terminal block data and control lines to a system that has an UART (Universal asynchronous receiver/transmitter) onboard. The EVM has pull up resistors on the TRS3122E FORCEOFF and FORCEON pins to keep both driver and receiver active. If desired, these signal can be driven by the external system to fully control all the features of auto-powerdown plus circuitry. The system may also benefit from monitoring the INVALID output to detect if an active connection has been made to the RS-232 port. Usage at 5 V The capacitors installed on the TRS3122EEVM were selected for VCC = 1.8 V and VCC = 3.3 V operation. It is required to change some of the onboard capacitors for 5 V testing. Capacitor Changes 2 VCC voltage C1 C2 C4 C5 1.8 V, 3.3 V 100 nF 100 nF 100 nF 100 nF 5V 47 nF 330 nF 330 nF 330 nF TRS3122EEVM User's Guide SLCU001 – May 2016 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated www.ti.com Connector/Test Points DB9 Connector DB9 Connector Pinout The female DB9 port provides access to the TRS3122E device through a standard RS-232 pinout. The TRS3122E female port is DCE to mate with a computer's male DTE port. The pin names are counterintuitive on the DCE side. For example the RX pin on EVM is connected to a driver and TX connects to a receiver. • Pins 1 and 9 are not connected. • Pins 2, 3, 7, 8 provide access to the RS-232 communication lines RX1, TX1, RTS1, CTS1 respectively. • Pins 4 and 6 are shorted together by a 0 Ω resistor to loopback the unused handshaking lines. • Pin 5 is grounded. Screw Terminal Connector Screw Terminal Connector Pinout The screw terminal port provides access to the TRS3122E device communication pins as well as control, output, and power pins. Note that pins are numbered from left to right in the description below. • Pins 1 through 4 provide access to the logic communication lines CTS2, RX2, RTS2, and TX2 respectively. • Pin 5 connects to the INVALID pin, which has the function described by the INVALID Pin Function Table. INVALID Pin Function INPUTS OUTPUT RIN1, RIN2 FORCEON FORCEOFF TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION Any L or H X X X H All Open X X X L • INVALID Pin 6 connects to the FORCEOFF pin, and Pin 7 connects to the FORCEON pin. Please see the Driver Function Table and the Receiver Function Table for pin functions. SLCU001 – May 2016 Submit Documentation Feedback TRS3122EEVM User's Guide Copyright © 2016, Texas Instruments Incorporated 3 www.ti.com Driver Function Table INPUTS DIN FORCEON OUTPUT FORCEOFF TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION DOUT X X L X Hi-Z L H H X H H H H X L L L H 30s Hi-Z DRIVER STATUS Powered off Normal operation with autopowerdown plus enabled Normal operation with autopowerdown plus enabled Powered off by autopowerdown plus feature Receiver Function Table INPUTS FORCEOFF FORCEON X L X X Hi-Z L H X X H H H X X L Open H X X H RIN • • • OUTPUT TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION ROUT RECEIVER STATUS Powered off Normal Operation with autopowerdown plus disabled/enabled Pin 8 connects to the VL pin, which is the logic level supply to which all logic inputs and outputs are referenced. Pin 9 is connected to VCC, the supply voltage for the device's charge pump. Pin 10 is connected to GND. Board Test Points EVM top view image The TRS3122EEVM provides test points for all RS-232 (TX1, RTS1, RX1, CTS1) and logic (TX2, RTS2, RX2, CTS2) communication lines in addition to a ground test point. 4 TRS3122EEVM User's Guide SLCU001 – May 2016 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated www.ti.com Printed Circuit Board Layouts PCB Layout PCB Layout PCB Layer Plots Figure 0-1. Top Layer Figure 0-2. Bottom Layer SLCU001 – May 2016 Submit Documentation Feedback TRS3122EEVM User's Guide Copyright © 2016, Texas Instruments Incorporated 5 www.ti.com Figure 0-3. Top Overlay Figure 0-4. Top Solder Mask Figure 0-5. Bottom Solder Mask Figure 0-6. Drill Drawing Figure 0-7. Board Dimensions 6 TRS3122EEVM User's Guide SLCU001 – May 2016 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated www.ti.com Schematic TRS3122EEVM Schematic SLCU001 – May 2016 Submit Documentation Feedback TRS3122EEVM User's Guide Copyright © 2016, Texas Instruments Incorporated 7 www.ti.com Bill of Materials Description !PCB1 1 C1, C2, C3, C4, C5, C6, C7 7 0.1 µF CAP, CERM, 0.1 µF, 25 V, +/- 10%, X7R, 0402 C8 1 1 µF J1 Package Reference Printed Circuit Board Part Number Manufacturer HVL130 Any 0402 GRM155R71E104K E14D MuRata CAP, CERM, 1 µF, 25 V, +/- 10%, X7R, 0603 0603 GRM188R71E105K A12 MuRata 1 CONN DB9 FEMALE R/A SOLDER SMD 30.81 x10.28 x10.10 mm 190-009-263R001 NorComp J2 1 Terminal Block, 10x1, 2.54 mm, TH Term Block, 10x1, 2.54 mm, 1725737 TH Phoenix Contact R1, R2, R3, R4 4 10.0 k RES, 10.0 k, 1%, 0.1 W, 0402 0402 ERJ-2RKF1002X Panasonic R5, R6, R7, R8, R9 5 0 RES, 0, 5%, 0.063 W, 0402 0402 ERJ-2GE0R00X Panasonic TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 8 SMT Test Point, Miniature, SMT Testpoint_Keys 5015 tone_Miniature Keystone TP9 1 Test Point, Miniature, SMT Testpoint_Keys 5015 tone_Miniature Keystone U1 1 RS-232 (2 - 2) TRANSCEIVER WITH SPLIT SUPPLY PIN FOR LOGIC SIDE, RGE0024H RGE0024H TRS3122ERGER Texas Instruments FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A Reference 1. TRS3122E 2Tx/2Rx Low Voltage, Low Power RS232 Transceiver data sheet (SLLSET7) 8 TRS3122EEVM User's Guide SLCU001 – May 2016 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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