Datenblatt für SN65HVS882EVM User Guide von Texas Instruments

l TEXAS INSTRUMENTS (SLASSO1
1 Introduction
2 EVM Schematic and Layout
SN65HVS882
IP0
IP1
IP3
IP2
IP4
IP5
IP6
IP7
GND
PAD
VCC
DB0
DB1
RLIM
RE0
RE1
RE2
RE3
RE4
RE5
RE6
RE7
SIP
LD
CLK
CE
SOP
TOK
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
TOK
5VOP
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
5VOP 15
VIN
GND
VCC
RLIM 1:3
R0:7
100 W(SeeNote A)
D0:7
(3mA)
JMP1
JMP3
TB1
R8: 16.9kW
R9: 24.9kW
R10: 49.9kW1.3k
2.2 Fm
22nf
2.2 Fm
1.3k
JMP4
TOK5VOP
2.2 Fm
User's GuideSLAU249A – May 2008 – Revised February 2009
SN65HVS882EVM
This user's guide briefly describes the operation of the SN65HVS882EVM evaluation module. Included arethe schematic and board layout.
The SN65HVS882 evaluation module (EVM) supports the rapid, parametric evaluation of theSN65HVS882 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.
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.
Note A: R0:7 had a 0- Ωresistor installed on the original EVM release.
Figure 1. SN65HVS882EVM Schematic
SLAU249A – May 2008 – Revised February 2009 SN65HVS882EVM 1
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GND
VIN
SN65HVS882
RIN 0:7 LED 0:7
TOK
RLIM 1:3
JMP1
TB1
JMP3
JMP2
CE
VIN
VCC
GND
5VOP
GND
GND
R8
R9
R10
RLIM 1:3
DB0
DB1
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
SN65HVS882
EVM
6500731
JMP4
VIN
VCC
5VOP
TOK
LD
SOP
SIP
CLK
EVM Schematic and Layout
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Figure 2. SN65HVS882EVM Layout
TB1 receives the board supply of 24 V, nominal. VCC supplies the SN65HVS882 device, and VINprovides the supply for sensor switches.
On the application of VCC, the blue TOK LED indicates proper board function. At the same time, the redLED 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 isless than 100 Ωcan produce a transient voltage greater than the AbsoluteMaximum Rating for IPx Input Voltage which can lead to Electrical overstressand device damage.
In all three cases, a 24-V 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.
On 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.
2SN65HVS882EVM SLAU249A – May 2008 – Revised February 2009
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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 toground.
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,R
LIM
1:3. For a current limit of 5.3 mA, connect R
LIM
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 theSN65HVS882 data sheet (SLAS601 ).
SLAU249A – May 2008 – Revised February 2009 SN65HVS882EVM 3
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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 .
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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.
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 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 125 °C. The EVM is designed to operateproperly with certain components above 125 °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.
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