Texas Instruments SLAU245 User manual

1 Introduction
2 EVM Schematic and Layout
User's GuideSLAU245 – March 2008
SN65HVS880 EVM User's Guide
The SN65HVS880 evaluation module (EVM) supports the parametric evaluation of the SN65HVS880digital 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.
Figure 1 shows the board circuit schematic, and Figure 2 shows the board layout top view. The boardincludes a terminal block, TB1, and four connectors, JMP1 to 4.
TB1 receives the board supply of 24V nominal. V24 supplies the SN65HVS880 device, and VFIELDprovides the supply for sensor switches.
Upon the application of V24, the blue Chip-Okay LED (CHOK) indicates proper board function. At thesame 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 thecorresponding LEDs D0:D7.
JMP2 provides access to the control and data lines of the internal serializer. To operate the serializer, CEmust 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 fieldinputs is latched into the serializer. Applying eight consecutive clock cycles at CLK, shifts out the serializerdata 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 theSIP 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 toground.
Note: the open DB inputs are internally pulled high and will not float.
Setting a specific current limit requires a connection between the R
LIM
output and one of the resistors, R
LIM1:3. For a current limit of 3.6mA connect R
LIM
to 24.9k Ω, for 3mA to 30.1k Ω, and for 2.5mA to 36.1k Ω.
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 theSN65HVS880 data sheet.
SLAU245 – March 2008 SN65HVS880 EVM User's Guide 1Submit Documentation Feedback

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SN65HVS880
IP0
IP1
IP3
IP2
IP4
IP5
IP6
IP7
FGND
PAD
V24
DB0
DB1
RLIM
RE0
RE1
RE2
RE3
RE4
RE5
RE6
RE7
SIP
LD
CLK
CE
SOP
CHOK
3
5
7
9
11
18
20
22
28
14
1
2
13
4
6
8
10
12
17
19
21
27
26
25
24
23
16
JMP2
SIP
LD
CLK
CE
SOP
CHOK
5VOP
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
5VOP 15
VFIELD
GND
V24
RLIM 1:3
R 0:7
1.2k
D 0:7
(3mA)
JMP1
JMP3
TB1
24.9k
29.1k
34.8k 1.3k
2.2 Fm
2.2 Fm
22nF
2.2 Fm
1.3k
JMP4
CHOK5VOP
GND
SN65HVS880
RIN 0:7 LED 0:7
CHOK
RLIM 1:3
JMP1
TB1
JMP3
JMP2
VFIELD
V24
GND
5VOP
GND
GND
24.9k
30.1k
36.1k
RLIM 1:3
DB0
DB1
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
SN65HVS880
V24 SEN
LD
EVM
6498378
JMP4
CE
CLK
5VOP
CHOK
SIP
SOP
EVM Schematic and Layout
Figure 1. SN65HVS880 EVM Schematic
Figure 2. SN65HVS880 EVM layout
2SN65HVS880 EVM User's Guide SLAU245 – March 2008Submit Documentation Feedback

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 PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot 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 fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY 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 claimsarising 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 allappropriate 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 ANYINDIRECT, 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 orservices 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. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety 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, orcombination 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 PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2008, Texas Instruments Incorporated
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 questionsconcerning 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 operateproperly with certain components above 85 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing 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 75265Copyright © 2008, Texas Instruments Incorporated

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