User's Guide SLLU158 – December 2011 CAN EVM User Guide This User Guide details the CAN EVM (Controller Area Network Evaluation Module) transceiver operation. It comes with the SN65HVD255 CAN transceiver factory installed. The CAN EVM may be user-reconfigured for use with the all TI CAN transceiver families: SN65HVD23x, SN65HVD25x, SN65HVD10x0 and SN65HVDA54x by replacing the transceiver and setting jumpers on the EVM as outlined in this document. This User Guide explains the EVM configurations for basic CAN evaluation, various load and termination settings. Topic 1 2 3 ........................................................................................................................... Page Introduction ........................................................................................................ 2 2 EVM Setup and Operation ................................................................................. 5 CAN EVM Configuration for SN65HVD255 (Factory Installed) ................................... 9 SLLU158 – December 2011 Submit Documentation Feedback CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated 1 Introduction 1 Introduction 1.1 Overview www.ti.com Texas Instruments offers a broad portfolio of High Speed (HS) CAN transceivers compatible with the ISO11898-2 High Speed CAN standards. These include 5V VCC only, 3.3V VCC only, 5V VCC with I/O level shifting and galvanic-isolated CAN transceivers. These CAN transceiver families include product mixes with varying features such as low power standby modes with and without wake up, silent modes, loop back and diagnostic modes. The Texas Instruments CAN EVM helps designers evaluate the operation and performance of various TI CAN transceivers. It also provides PCB footprints for different bus termination, bus filtering and protection concepts. The CAN EVM is provided with the SN65HVD255 installed. It is easily configured by the customer for the SN65HVD23x, SN65HVD25x, SN65HVD10x0 and SN65HVDA54x CAN transceiver families as needed by jumper settings, simple soldering tasks and replacement of standard components. A separate EVM is available for the galvanic-isolated CAN transceiver family. 1.2 CAN EVM The CAN EVM has simple connections to all necessary pins of the CAN transceiver device, and jumpers where necessary to provide flexibility for device pin and CAN bus configuration. There are test points (loops) for all main points where probing is necessary for evaluation such as GND, VCC, TXD, RXD, CANH, CANL, Pin 8 (mode pin), Pin 5 (various functions). The EVM supports many options for CAN bus configuration. It is pre-configured with two 120Ω resistors that may be connected on the bus via jumpers: a single resistor is used with the EVM as a terminated line end (CAN is defined for 120Ω impedance twisted pair cable) or both resistors in parallel for electrical measurements representing the 60Ω load the transceiver “sees” in a properly terminated network (i.e. 120Ω termination resistors at both ends of the cable). If the application requires “split” termination, TVS diodes for protection, or Common Mode (CM) Choke, the EVM has footprints available for this via customer installation of the desired component(s). Figure 1. EVM PC Board 2 CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated SLLU158 – December 2011 Submit Documentation Feedback TB1 2 1 2PIN_TERMINAL_BLOCK Header 10x1 1 JMP2 VRXD D3 LED R20 330 C8 4.7uF R6 DNI C10 10uF VCC VCC Place near DUT Pint C5 DNI R5 DNI C11 1uF R10 0 C12 .1uF C3 DNI VCC TP1 Test Point TP7 Test Point TP9 Test Point R13 0 TP10 Test Point 1 Copyright © 2011, Texas Instruments Incorporated 1 VCC VCC 1 1 VCC 4 3 2 1 C1 DNI STB SPL RXD TP8 Test Point 0 R19 0 R17 0 5 6 7 8 R4 SN65HVD1040 CANL Vcc GND CANH TXD U1 1 1 L1 2 1 4 R9 5 1 3 R18 4.7k 4 JMP6 VCC C6 DNI 0 VRXD 2 3 Header T 4pin 4 R14 0 TP3 Test Point R2 DNI 1 JMP1 R1 4.7k C9 1uF VCM R3 0 1 2 JMP4 R11 120 1 1 2 JMP5 TP12 Test Point 1 R12 120 R15 DNI R7 DNI R8 330 C7 DNI TP6 Test Point R16 330 C4 TP4 DNI Test Point C2 DNI Verify EIA 0603 size versus 0603 TP13 Test Point 1 TP11 Test Point 1 1 SLLU158 – December 2011 Submit Documentation Feedback 1 2 2 1 MMBZ D2 MMBZ D1 3 3 1 TP2 Test Point 1 VCC Test Point TP5 1 2 3 4 Header 4x1 JMP3 www.ti.com Introduction Figure 2. EVM Schematic CAN EVM User Guide 3 Introduction www.ti.com Table 1. Connection Type Description JMP1 4 pin jumper JMP2 10 pin header Connection for access to all critical digital I/O, supply and GND for driving the CAN transceiver externally with test equipment or interfaced to a processor EVM JMP3 4 pin header CAN bus connection (CANH, CANL) and GND JMP4 2 pin jumper Connect 120Ω CAN termination to the bus. Used separately for a single termination if EVM is at end of the CAN bus and termination isn’t in the cable. Used in combination with JMP5 to get to second CAN termination to represent the combined 60Ω load for CAN transceiver parametric measurement. JMP5 2 pin jumper Connect 120Ω CAN termination to the bus. Used in combination with JMP4 to get to second CAN termination to represent the combined 60Ω load for CAN transceiver parametric measurement. JMP6 5 pin jumper Functional use of pin 5. Options for use are:A) 4.7kΩ pull up to VCC for transceiver with digital input on pin 5B) 0Ω pull down to GND for transceiver with digital input on pin 5C) Active split termination: for CAN transceiver with VREF or SPLIT pin where active split termination is desired. Connect to VCM and populate the components R7/R15 and C4 as required for the system.D) VRXD (VIO) for CAN transceivers with a separate VRXD (VIO) for I/O level shifting. TB1 2 pin jumper VCC supply and GND connection for the EVM Used for mode selection on pin 8 (4.7kΩ pull up to VCC, 0Ω pull down to GND, customer installable pull down for devices with slew rate control RS pin). TP1 TXD, Device Pin 1 test point TP2 CANH (bus) test point TP3 Device Pin 8 test point TP4 CANH via 330Ω serial resistor test point TP5 CANL (bus) test point TP6 CANL via 330Ω serial resistor test point TP7 Test Point RXD, Device Pin 4 test point TP8 Device Pin 5 test point TP9 VCC test point TP10 TP11 TP12 GND test point TP13 4 CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated SLLU158 – December 2011 Submit Documentation Feedback 2 EVM Setup and Operation www.ti.com 2 2 EVM Setup and Operation This section describes the setup and operation of the EVM for parameter performance evaluation. 2.1 2.1.1 Overview & Basic Operation Settings VCC Power Supply (TB1 or TP9 or JMP2) The basic setup of the CAN EVM uses a single power supply required to evaluate standard 5V or 3.3V single supply transceiver devices performance. For single-supply transceivers, connect the 5V or 3.3V VCC supply to the TB1 jumper header, or the VCC and GND test-point loops. The power supplied should meet the required specification of VCC for the transceiver being tested. LED D3 is used to indicate VCC presence. 2.1.2 I/O Power Supply VRXD or VIO (JMP2, JMP6 or TP8) For devices with I/O level shifting, a second supply pin for the I/O or RXD pin is on Pin 5 of the transceiver device. A second power supply is needed to test one of these devices and should be connected via JMP2, JMP6 or TP8. A local buffering and decoupling capacitor should be installed at C6 if the EVM is used for one of these devices. 2.1.3 Main Supply and I/O Header (JMP2) All key I/O and supply GND functions are brought to this header. It may be used on either interface to test equipment or a short cable could be made to connect to either an existing customer application board or MCU/DSP EVM board for a processor with a CAN controller Table 2. Pin Connection Description 1 MODE 2 TXD Pin 1 of Transceiver. TXD (Transmit Data) 3 GND Pin 2 of Transceiver. GND. 4 GND Pin 2 of Transceiver. GND. 5 RXD Pin 4 of Transceiver. RXD (Receive Data) 6 GND Pin 2 of Transceiver. GND. 7 VCC 8 GND 9 P5 10 VRXD Pin 8 of Transceiver, normally used for Mode control. Examples: RS, S, STB. Pin 3 of Transceiver. VCC Pin 2 of Transceiver. GND. Pin 5 of Transceiver, various functions depending on transceiver. Examples: VREF, SPLIT, VRXD, VIO, LBK, EN, AB and No Connect (NC). Connects to Jumper JMP6 VRXD header to allow flexibility in using device with power supply for I/O on Pin 5 of transceiver. This header is arranged to provide a separate grounds for each signal pair (TXD/GND and RXD/GND). If the EVM is being used with lab equipment, separate cables can be connected to these main points via simple 2 pin header connectors.If the board is being connected to a processor based system, a single cable with all power & signals can be connected via a 10 pin header cable to this port. 2.1.4 TXD Input (JMP2 or TP1) The TXD (pin 1) of the transceiver, transmit data is routed to JMP2 and TP1. The signal path to the JMP2 header is pre-installed with a 0Ω series resistor, R10. 2.1.5 RXD Output (JMP2 or TP7) The RXD (pin 4) of the transceiver, receive data is routed to JMP2 and TP7. The signal path to the JMP2 header is pre-installed with a 0Ω series resistor, R13. SLLU158 – December 2011 Submit Documentation Feedback CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated 5 2 EVM Setup and Operation 2.1.6 www.ti.com MODE Select/ Pin 8 (JMP1, JMP2 or TP3) Pin 8 of the transceiver is normally a mode control pin of the device. Pin 8 of the device is routed to JMP1, JMP2 and TP7. 2.1.7 MODE - JMP1 configurations (3 way jumper) If using separate I/O inputs JMP1 will be used to configure pin 8 to a pull up to VCC or pull down to GND configuration. For most devices when Pin 8 is pulled to GND the device will be in “normal” or high speed mode. R3 is pre-installed with 0Ω resistor to GND for this purpose. For most devices when Pin 8 is pulled to VCC the device will be in a silent or low power standby mode. Devices with slope control mode use the resistance to ground value to determine the slope of the driver output. R2 is left open for customers who want to install a resistance to ground and use slope mode. 2.1.8 JMP2 configuration Using header JMP2 which assumes all the digital I/O signals, VCC, GND are routed to an external system. Ensure that the MODE (JMP1) jumper settings are not conflicting with signals to JMP2. 2.1.9 TP3 configuration This connects directly to device pin 8. Ensure JMP1 configuration isn’t conflicting if TP3 is used as the input connection. 2.1.10 Pin 5 (JMP6, JMP2 or TP8) Pin 5 of the transceiver have various uses depending on the transceiver. Examples are VREF, SPLIT, VRXD, VIO, LBK, EN, AB and No Connect (NC). Pin 5 of the device is routed to JMP6, JMP2 and TP8. 2.1.11 Pin 5 – JMP6 configurations (4 way jumper) If using separate I/O inputs JMP6 will be used to configure pin 5 to: pull up to VCC, pull down to GND, VRXD / VIO supply input or VREF/SPLIT termination output. • VREF/SPLIT termination: If the device & application support split termination then JMP6 should be set to VCM (V Common Mode) to drive the VREF/SPLIT pin common mode stabilizing voltage output to the center tap of the split termination capacitor. These components will need to be installed on the EVM as outlined in the CAN bus termination section. • No Connection: If the device & application require no use of pin 5 then it may be left open. If the device has VREF or SPLIT pin but the application isn’t using the pin for split termination then a capacitor may be added on C6 to improve EMC performance. • 2nd Mode / Control Input: if the device & application use pin 5 as a second mode or control pin then JMP6 should be set to as either a pull up to VCC or pull down to GND as necessary. • I/O & RXD level shifting supply: if the device & application use with VIO or VRXD to level shift I/O pins on the transceiver then JMP6 may be set to VRXD which connects pin 5 of the device to VRXD pin on JMP2. Local buffering and bypass capacitor C6 should be installed. 2.1.12 JMP2 configuration Using header JMP2 assumes all the digital I/O signals, VCC, GND are routed to an external system. Ensure that Pin 5 (JMP6) jumper settings are not conflicting with signals to JMP2. For power supply VRXD the jumper needs to be set to route JMP2 supply input to the transceiver pin. 2.1.13 TP8 configuration This connects directly to device pin 5. Ensure JMP6 configuration isn’t conflicting if TP8 is used as an input connection. 6 CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated SLLU158 – December 2011 Submit Documentation Feedback 2 EVM Setup and Operation www.ti.com 2.2 Using CAN Bus Load, Termination and Protection Configurations The CAN EVM is populated with two 120Ω power resistors selectable via jumpers between CANH and CANL. By using one, the EVM may be used as a terminated end of a bus. For electrical measurements to represent the total loading of the bus, use both 120Ω resistors in parallel to give the standard 60Ω load for parametric measurement. The EVM also has footprints is split termination is needed for the application. The table below summarizes how to use these termination options. If split termination is used, care must be taken to match the resistors. The common mode filter frequency may be calculated by: fC = 1/(2πRC). Normally, the split capacitance is in the range of 4.7nF to 100nF. Keep in mind this is the common mode filter frequency, not a differential filter that will impact the differential CAN signal directly. Table 3. Bus Termination Configuration Termination Configuration Split Termination Footprints 120Ω Resistors JMP4 JMP5 Standard Termination (120Ω) shorted open 60Ω load - Electrical Parameterics shorted shorted Split Termination (Common Mode Stabilization) open open Split Termination Footprints R7 R15 C4 N/A N/A N/A 60Ω 60Ω populated The EVM also has footprints for various protection schemes to enhance robustness for extreme system level EMC requirements. The table below summarizes these options. Table 4. Protection and Filtering Configuration Configuration Series Resistors or Common Mode Choke Bus Filtering Caps Transient Protection Footprint Reference R9 / R14 or L1 (common footprint) C2 / C7 C2 / C7 or D1 / D2 SLLU158 – December 2011 Submit Documentation Feedback Use Case Population & Description Direct CAN transceiver to bus connection R9 and R14 populated with 0Ω (default population) Series resistance protection CAN transceiver to bus connection R9 and R14 populated with MELF resistor as necessary for harsh EMC environment CM choke (bus filter) L1 populated with CM choke to filter noise as necessary for harsh EMC environment Bus filter Filter noise as necessary for harsh EMC environment. Filter caps may be used in combination with L1 CM choke. Transient & ESD Protection To add extra protection for system level transients and ESD protection TVS diode population option via D1/D2 footprint or varistor population via C2 / C7 footprint. CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated 7 2 EVM Setup and Operation 2.3 www.ti.com Using Customer Installable I/O options for Current Limiting, Pullup/Pulldown, Noise Filtering The CAN EVM has footprints on the PCB for the installation of various filtering and protection options to adapt the EVM to match CAN network topology requirements if the EVM is being used as a CAN node. Each digital input or output pin has footprints to allow for series current limiting resistors (default populated with 0Ω), pull up or down resistors depending on pin use and a capacitor to GND which configured with the serial resistor allows for RC filters (noisy environments). The table below lists these features for each of the digital input and output pins of the EVM. Replace or populate the RC components as necessary for the application. Table 5. RC Filter / Protection Lists Device Pin No. Description Jumperable Type Pull Up Pull Down Series R Pull Up/Down C to GND 1 TXD Input N/A N/A R10 R6 PU C3 2 RXD Output N/A N/A R13 R5 PU C5 NC No Connect N/A N/A N/A N/A N/A VREF/SPLIT Output N/A N/A R17 N/A C4 / C6 Split termination: JMP6 to route output to split termination center point capacitor C4. EMC for systems not using split termination: C6 to GND. VRXD/VIO Supply Input N/A N/A R17 N/A C9 / C6 Use TM6, JMP6 & JMP2 as necessary to provide supply input. AB / EN / LBK Input R18 (JMP6) R19 (JMP6) R17 N/A C6 S, RS, STB Input R1 (JMP1) R2 / R3 (JMP1) R4 N/A C1 NC No Connect N/A N/A N/A N/A N/A 5 8 8 Description CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated R2 pull down to GND (JMP1) user installable for use with slope mode on devices with RS pin. SLLU158 – December 2011 Submit Documentation Feedback CAN EVM Configuration for SN65HVD255 (Factory Installed) www.ti.com 3 CAN EVM Configuration for SN65HVD255 (Factory Installed) The SN65HVD255 meets ISO1189-2 High Speed CAN (Controller Area Network) Physical Layer standard (transceiver). It is designed as a next generation CAN for the ‘251 & ‘1050 pinout. It has very fast loop times with a wide range of bus loading allowing for data rates up to 1 megabit per second (Mbps) in long and highly loaded networks and higher data rates in small networks. The device includes many protection features providing device and CAN network robustness. The device has two modes: normal mode and silent mode selected on pin 8. TXD S GND CANH VCC CANL RXD NC Figure 3. SN65HVD255 Basic Block Diagram & Pin Out Table 6. EVM Connection Settings for SN65HVD255 Connection Description JMP1 Mode selection: Pull up to VCC for Silent Mode, Pull down to GND for normal mode JMP2 Connection for access to all critical digital I/O, supply and GND if being externally driven by test equipment or interfaced to a processor EVM. Note: ensure that JMP1, JMP6 & TB1 settings don't conflict with JMP2 if it is used. JMP3 CAN bus connection (CANH, CANL) and GND as necessary if interfacing EVM to a CAN network JMP4 Connect if necessary for a single CAN network termination JMP5 Connect if necessary for in parallel with JMP4 to get a 60Ω load to measure CAN parametrics JMP6 N/A: SN65HVD255 is no connect on pin 5 of the transceiver SLLU158 – December 2011 Submit Documentation Feedback CAN EVM User Guide Copyright © 2011, Texas Instruments Incorporated 9 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. 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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 voltage range of (specified in SN65HVD25x data sheet) and the output voltage range of (specified in SN65HVD25x data sheet) . 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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