Texas Instruments Network Card SLAU245 User Manual

User's Guide  
SLAU245March 2008  
SN65HVS880 EVM User's Guide  
1
2
Introduction  
The SN65HVS880 evaluation module (EVM) supports the parametric evaluation of the SN65HVS880  
digital input serializer. It is intended to be used in conjunction with the SN65HVS880 data sheet,  
(SLAS252).  
Note: this EVM is not intended for electromagnetic compatibility (EMC) tests.  
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.  
TB1 receives the board supply of 24V nominal. V24 supplies the SN65HVS880 device, and VFIELD  
provides the supply for sensor switches.  
Upon the application of V24, the blue Chip-Okay LED (CHOK) indicates proper board function. At the  
same time, the red LED indicates 5V availability at the regulator output 5VOP.  
JMP1 provides the field inputs IN0:IN7 for field voltages of 24V 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 VFIELD,  
c. or a direct connection between an input and VFIELD.  
In all three cases, a 24V 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.  
Upon 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.  
JMP3 allows the selection of three different debounce times and 3 different current limits.  
Debounce default is 3ms, and does not require any connection between the DB inputs to ground.  
Otherwise, for zero debounce time connect DB1 to ground, and for 1ms debounce time connect DB0 to  
ground.  
Note: the open DB inputs are internally pulled high and will 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 3.6mA connect RLIM to 24.9k, for 3mA to 30.1k, and for 2.5mA to 36.1k.  
JMP4 allows to connect VFIELD to V24, thus driving the board with only one supply.  
For detailed information on device functionality and system design recommendations, see the  
SN65HVS880 data sheet.  
SLAU245March 2008  
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SN65HVS880 EVM User's Guide  
 
1
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  
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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  
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TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or  
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Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This  
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No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or  
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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  
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EVM WARNINGS AND RESTRICTIONS  
It is important to operate this EVM within the input voltage range of 0 V to 30 V and the output voltage range of 0 V to 5 V.  
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 85°C. The EVM is designed to operate  
properly with certain components above 85°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.  
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265  
Copyright © 2008, Texas Instruments Incorporated  
 
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