SN65HVS882EVM

User's Guide SLAU249A – May 2008 – Revised February 2009 SN65HVS882EVM This user's guide briefly describes the operation of the SN65HVS882EVM evaluation module. Included are the schematic and board layout. 1 Introduction The SN65HVS882 evaluation module (EVM) supports the rapid, parametric evaluation of the SN65HVS882 digital input serializer. It is intended to be used with the SN65HVS882 (SLAS601). Note that this EVM is not intended for electromagnetic compatibility (EMC) tests. 2 EVM Schematic and Layout Figure 1 shows the board circuit schematic, and Figure 2 shows the board layout top view. The board includes a terminal block, TB1, and four connectors, JMP1 to 4. JMP1 R0:7 100 W (See Note A) IN0 3 IN1 5 IN2 7 IN3 9 IN4 11 IN5 18 IN6 20 IN7 22 IP0 RE0 IP1 RE1 IP2 RE2 IP3 RE3 IP4 RE4 IP5 RE5 IP6 RE6 IP7 RE7 SIP JMP4 TB1 VIN 22nf 2.2mF GND 2.2mF 28 14 VCC 1 2 R LIM 1:3 R8: 16.9kW D0:7 (3mA) SN65HVS882 13 PAD LD GND CLK VCC CE DB0 SOP DB1 TOK RLIM 5VOP 4 6 8 10 12 17 19 21 JMP2 27 26 SIP 25 LD 24 CLK 23 CE 16 SOP 15 TOK R9: 24.9kW 5VOP 1.3k R10: 49.9kW 1.3k 2.2mF JMP3 5VOP TOK Note A: R0:7 had a 0-Ω resistor installed on the original EVM release. Figure 1. SN65HVS882EVM Schematic SLAU249A – May 2008 – Revised February 2009 Submit Documentation Feedback SN65HVS882EVM 1 EVM Schematic and Layout www.ti.com JMP1 RIN 0:7 JMP3 LED 0:7 IN0 DB0 GND IN1 DB1 GND VIN IN3 SN65HVS882 IN4 R8 RLIM 1:3 IN2 R9 R10 IN5 IN6 SN65HVS882 EVM 6500731 IN7 5VOP RLIM 1:3 GND TOK VIN JMP2 VCC TB1 SIP LD CLK CE SOP TOK VIN VCC 5VOP GND JMP4 Figure 2. SN65HVS882EVM Layout TB1 receives the board supply of 24 V, nominal. VCC supplies the SN65HVS882 device, and VIN provides the supply for sensor switches. On the application of VCC, the blue TOK LED indicates proper board function. At the same time, the red LED indicates 5-V availability at the regulator output 5VOP. JMP1 provides the field inputs IN0:IN7 for field voltages of 24 V, nominal. They can be applied via: a. An external supply in series to a sensor switch connected to a field input b. Or a sensor switch connected between and input and VIN c. Or a direct connection between an input and VIN CAUTION Applying a shunt to IN0:7 inputs when VIN is greater than 24 Volts and R0:7 is less than 100 Ω can produce a transient voltage greater than the Absolute Maximum Rating for IPx Input Voltage which can lead to Electrical overstress and device damage. In all three cases, a 24-V level represents the ON-status of a sensor switch, which is indicated by the corresponding LEDs D0:D7. JMP2 provides access to the control and data lines of the internal serializer. To operate the serializer, CE must be connected either to ground or to CLK. On an active-low load pulse, (a high-to-low-to-high transition) at LD, the status information of the field inputs is latched into the serializer. Applying eight consecutive clock cycles at CLK, shifts out the serializer data at SOP with each rising edge of the clock. Cascading of multiple boards is also possible by connecting the SOP output of a leading device with the SIP input of a following device. 2 SN65HVS882EVM SLAU249A – May 2008 – Revised February 2009 Submit Documentation Feedback www.ti.com EVM Schematic and Layout JMP3 allows the selection of three different debounce times and 3 different current limits. Debounce default is 3 ms and does not require any connection between the DB inputs to ground. Otherwise, for zero debounce time, connect DB1 to ground, and for 1-ms debounce time connect DB0 to ground. Note that open DB inputs are internally pulled high and do not float. Setting a specific current limit requires a connection between the RLIM output and one of the resistors, RLIM 1:3. For a current limit of 5.3 mA, connect RLIM to R8, for 3.6 mA to R9, and for 1.8 mA to R10. JMP4 allows VIN to connect to VCC, thus driving the board with one supply only. For detailed information on device functionality and system design recommendations, see the SN65HVS882 data sheet (SLAS601). SLAU249A – May 2008 – Revised February 2009 Submit Documentation Feedback SN65HVS882EVM 3 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input and output voltage ranges specified in the data sheet (SLAS601). Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 125°C. The EVM is designed to operate properly with certain components above 125°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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