CAN/I2C Activity Board Pro User Manual v1.00
Contents
1. Part National Semiconductor DACO081C085 Datasheet http www national com profile snip cgi openDS DAC081C085 This component is a single channel 8 bit digital to analog converter It can drive its output between OV and VDD with a precision of approximately 12 9 mV It can communicate directly over 1 C or over CAN through the bridge Please see the DAC081C085 datasheet for more information On startup the DAC s output is set to high impedance Once a value is set it will be configured to normal operation and output the desired voltage 3 1 1 CAN Operation Get Sensor Data Not applicable This device will not respond to Get Sensor Data requests Set Sensor Data To set the DAC value a single byte needs to be transmitted with the requested DAC setting See Table 10 Table 10 CAN Set DAC Data Payload Byte Data Notes 0 DAC Setting 0x00 OxFF representing 0 to 3 3 V Example Setting the DAC to approximately 1 65 V See Table 11 Table 11 CAN Set DAC Data Example Transmiter CAN 10 ATR DLC Data 3 1 2 I C Operation Please consult the DAC081C085 datasheet for details on 1 C operation 14 Y TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 2 Motion Sensor 0x1D Moticn ava Ot po Figure 4 Motion Sensor Part STMicroelectronics LIS33DE Datasheet www st com stonline products literature ds 15596 lis33de pdf This component is a 3 axis linear accelerometer It can communicate dire2. Speed The CAN I C Activity Board Prowill run at 125 kbps by default If a different bitrate is desired set the board to auto baud on the CAN bus through the appropriate selection pin see Section 2 4 1 2 2 Known CAN Limitations CAN Buffer Saturation The CAN bridge includes multiple receive buffers for CAN packets If the CAN receive buffer overflows then packets will be acknowledged by the node but not processed The CAN bridge also includes a small number of transmit buffers for which outgoing packets can be queued A packet will not leave this queue until it has been successfully transmitted If the queue is full when the bridge attempts to write another CAN packet to the bus it will block until there is room in the queue In order to avoid either buffer saturating no more than approximately 10 packets per 100 ms should be sent on the CAN bus 1 3 IC Signaling Characteristics 1 3 1 Speed The IC on the CAN I C Activity Board Pro operates at 100 kHz 1 3 2 Pull up Resistors The CAN I C Activity Board Pro includes a 4 7 k pull up resistor to VDD on the SCL and SDA lines 1 3 3 Known C Limitations The CAN I C Activity Board Pro is not designed to work with multi master situations If the board is intended to be used with other 1 C masters then the I C master functionality SY TOTAL PHASE CAN I2C Activity Board Pro User Manual of the CAN bridge should be inhibited See Section 2 4 for more information on how to
3. To change the mode simply place jumpers on the appropriate selection and hit the reset button Table 5 Selection Header J303 Pinout SELO Sets the CAN bridge to Autobaud on start up SEL1 Sets the CAN bridge to broadcast all sensor data every 100 ms SY TOTAL PHASE CAN I2C Activity Board Pro User Manual Disables interrupt handling of devices on the CAN bridge Notes e If SELO is selected the CAN bridge will not process any packets on CAN or I C until a baudrate has been selected This can take several seconds e SEL1 should never be selected if the CAN I C Activity Board Pro is being used in 1 C mode as it can cause multi master arbitration errors e SEL2 should be selected whenever the CAN I C Activity Board Pro is being used in C mode This will prevent multi master arbitration errors when interrupts occur 2 5 Program Header J304 This header must be jumped to program the AT90CAN32 microcontroller 2 6 Aardvark Connector J401 This connector is provided to interface with the Aardvark C SPI Host Adapter It is necessary to provide target power 4 5 V to 5 0 V to the CAN I C Activity Board Pro through VDD on this connector or through V on the Komodo connector This connector s pinout is listed in Table 6 Table 6 Aardvark Connector J401 Pinout 10 Y TOTAL PHASE CAN I2C Activity Board Pro User Manual SPI signals are for internal use only 2 7 ADC Header J402 This hea
4. access as described in Section 2 1 If interrupts are not disabled changes to the inputs will cause the bridge to broadcast the data on the CAN bus 3 4 1 CAN Operation Get Sensor Data 19 SY TOTAL PHASE CANII2C Activity Board Pro User Manual The port expander will respond with 1 byte of data describing the current value of each input pin See Table 16 Getting the Sensor data is equivalent to reading from the Input Register as described in the device datasheet Table 16 CAN Get GPIO Data Payload Bvie Date Woes pat Value Bt mask af each input in Example Polling the GPIO port expander See Table 17 Table 17 CAN Get GPIO Data Example Transmitter DLC Data Komodo 0x039 True N A Activity Board 0x039 OxAA Set Sensor Data The outputs of the port expander can be set by sending 1 byte of data describing the desired value of each output See Table 18 Setting the Sensor Data is equivalent to writing to the Output Register as described in the device datasheet Note that the port expander powers up as all inputs In order to have outputs configured the Extended Opcodes will have to be used Table 18 CAN Set GPIO Data Payload Byte Data Notes O o Output Value Bit mask of desired output on each pin Example Setting every other output high on the GPIO port expander See Table 19 Table 19 CAN Set GPIO Data Example 20 TOTAL PHASE CAN I2C Activity Board Pro User Manual A
5. do this 1 4 Communication Protocol It is important to understand the basics of how the CAN I C Activity Board Pro operates and how the target devices communicate over both CAN and I C None of the targets are CAN compatible themselves but the CAN I C Activity Board Pro features a microcontroller which serves as a bridge between the CAN bus and the target interfaces This bridge allows all of the targets to operate as CAN nodes on the CAN bus Many of the targets are I C devices so they can interface directly with the Aardvark I C SPI Host Adapter The microcontroller also implements an 1 C slave 0x42 which allows the LCD display and ADC to communicate over I C 1 4 1 CAN The CAN bridge simulates a number of CAN nodes by bridging each I C device on the CAN I C Activity Board Pro to the CAN bus Each node ID is equivalent to the 1 C ID which is displayed on the silkscreen of the PCB The CAN I C Activity Board Pro follows a protocol that is similar to CANOpen Each 11 bit ID field of the CAN packet is split into a 7 bit node address and a 4 bit opcode Two opcodes are defined in Table 2 which can be used for standard communication with the CAN bridge Table 2 Standard CAN OpCodes 0000 Request device data 0010 0 Set device data As an example if we were to set the programmable LEDs on the board then we would send the following information on the bus CAN ID OpCode Node ID 0010 0111010 0x13A RTR False
6. document is subject to change without notice and should not be construed as a commitment by Total Phase While the information contained herein is believed to be accurate Total Phase assumes no responsibility for any errors and or omissions that may appear in this document 5 2 Life Support Equipment Policy Total Phase products are not authorized for use in life support devices or systems Life support devices or systems include but are not limited to surgical implants medical systems and other safety critical systems in which failure of a Total Phase product could cause personal injury or loss of life Should a Total Phase product be used in such an unauthorized manner Buyer agrees to indemnify and hold harmless Total Phase its officers employees affiliates and distributors from any and all claims arising from such use even if such claim alleges that Total Phase was negligent in the design or manufacture of its product 5 3 Contact Information Total Phase can be found on the Internet at http www totalphase com If you have support related questions please email the product engineers at support totalphase com For sales inquiries please contact sales totalphase com 31 SY TOTAL PHASE CANII2C Activity Board Pro User Manual 2011 2011 Total Phase Inc All rights reserved 32
7. w No Stop 1110 o I2C Write w No Stop By following the specific C communication protocol for a specific sensor the extended CAN opcodes can be used to access any feature of the I C device As an example if we were to configure the GPIO port expander to have 4 nputs and 4 outputs we would need to send the following command CAN ID OpCode Node ID 1010 0111010 0x539 Data 0x03 OxOF Once configured this way the GPIO input pins could be polled or outputs set through the standard opcode method described previously If instead we were to read out the current configuration of the GPIO node we would actually need to send two I C commands The first sets up the register we wish to read with a No Stop condition and the second reads the data out SY TOTAL PHASE CAN I2C Activity Board Pro User Manual CAN ID OpCode Node ID 1110 0111010 0x739 CAN ID OpCode Node ID 1000 0111010 0x439 Please note that once a No Stop condition is issued to the CAN bridge it will ignore all standard requests until a Stop condition has been issued Additionally if an 1 C command is lost due to arbitration issues it will not be retransmitted on the I C bus 1 4 2 IC The CAN I C Activity Board Pro uses I C to communicate with each of the nodes on the bus For specifics on how to communicate with a specific node please refer to Section 3 1 5 CAN Bridge Interrupts The CAN bridge is tied t
8. when using an Extended Opcode Get Sensor Data The CAN Bridge will respond with 3 bytes of ADC information when the Get Sensor Data request is made See Table 22 The Get Sensor Data will only get data from the ADC It will not return any LCD information Table 22 CAN Get ADC Data Payload AD Ch busines ADC Ch0 8 bit unsigned Po Example Polling the ADC See Table 23 Table 23 CAN Get ADC Data Example Transmitter CAN ID DLC Data Komodo 0x042 True Activity Board 0x042 OxAA OxBB OxCC Set Sensor Data The Set Sensor Data is used to set the LCD text on the screen See Table 24 The Set Sensor Data will only set data on the LCD It will not set any ADC information 24 SY TOTAL PHASE CANII2C Activity Board Pro User Manual The LCD screen is broken up into four segments of 4 characters Each data segment is written to individually If not all 4 characters of a segment are included in the CAN payload then the remainder are filled with spaces Table 24 CAN Set LCD Data Payload Bye Daa noes Character 0 ASCIl encoded Character 1 ASCIl encoded Character 2 ASCIl encoded Character 3 ASCIl encoded Example Writing Hello World to the LCD screen See Table 25 Table 25 CAN Set LCD Data Example 0x142 0x00 0x48 0x65 Ox6c 0x6c 0x142 0x01 Ox6f 0x20 0x57 Ox6f 0x142 0x02 0x72 Ox6c 0x64 0x21 3 6 2 I C Operation Because both the ADC and LCD share a device ad
9. CAN IC Activity Board Pro ry Total Phase CAN I2C Activity Board Pro Supported products FC SPI E TOTAL PHASE woe beta hene som Summary The CAN I C Activity Board Pro is a great tool to help with embedded systems development This activity board provides working target devices to aid developers in the debugging of their systems and interface software Target devices featured on this activity board can operate as CAN nodes or I C slaves This board is compatible with the Komodo CAN Duo interrface and the Aardvark I C SPI Host Adapter User Manual v1 00 July 15 2011 Y TOTAL PHASE CANII2C Activity Board Pro User Manual 1 Hardware Specifications 1 1 Signaling Level Voltage Ratings Table 1 Electrical Characteristics Requirements Parameter dn Moe Jumi OOOO ooo o i es CAN Single ended Output Dominant em fos 15 v 3 Differential Output Dominant Differential Output Recessive Supply Input I C Inputs Low 12C Inputs High 2C Outputs Low GPIO Port Expander GPIO Inputs Low eric oupas tom o v Po Oupuis ion Je id ADC mens Jo w eona of w C Sma Fe reus ton RC reas Notes e The CAN I C Activity Board Pro will not supply target power on the Komodo or Aardvark header SY TOTAL PHASE CANII2C Activity Board Pro User Manual e The CAN bus is not electrically isolated from the rest of the board 1 2 CAN Signaling Characteristics 1 2 1
10. DLC 0x80 On the other hand if we were to poll the Joystick for its current position we would send the following information on the bus CAN ID OpCode Node ID 0000 0111010 0x03A RTR True SY TOTAL PHASE CAN I2C Activity Board Pro User Manual oma a S S S The response from the CAN bridge will then be a non RTR packet with the same CAN ID and will have the appropriate data payload Using these Standard Opcodes provides a convenient method for getting and setting device data however it does not necessarily provide a means to access the full functionality of each node For example this protocol does not define a method for configuring specific pins of the GPIO port to be inputs or outputs In order to complete more advanced tasks on a node it is important to remember that each node on the CAN I C Activity Board Pro is in reality an I C device and that the CAN bridge functions as an I C master on this bus The opcodes provided earlier simply abstracted one or more I C calls to the I C slave in order to get or set the device data The following opcodes provide a mechanism for controlling the 1 C master explicitly In each case the opcode determines the type of C command being sent the node ID would represent the I C slave to be addressed and the data payload would be the actual data transmitted on the bus Table 3 Extended CAN OpCodes 1000 C Read w Stop 1010 oO I2C Write w Stop 1100 IC Read
11. IO Port Expander Section 3 4 except that the node ID is 0x3A instead of 0x39 3 5 2 I C Operation Please consult the PCA9554AD datasheet for details on I C operation Do not attempt to configure pins O0 IO4 as outputs this can damage the CAN I C Activity Board Pro 22 TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 6 ADC LCD 0x42 Figure 8 ADC and LCD Part Internal to CAN Bridge Datasheet N A Unlike all the other devices on the board the ADC and LCD are not external I C devices Instead they are implemented on the MCU and can be accessed over lC or CAN at the node address of 0x42 The CAN Bridge MCU has a built in ADC which is exposed on the PCB The CAN I C Activity Board Pro allows the user to read 3 of these analog inputs with an 8 bit resolution Inputs may range from 0 V to a maximum of 3 3 V To determine the analog input value from the received ADC data use the following equation 23 SY TOTAL PHASE CAN I2C Activity Board Pro User Manual The LCD is a 2x8 character display that is connected to the CAN bridge over a parallel bus The characters on the display are ASCIl encoded 3 6 1 CAN Operation Because the ADC and LCD slaves are internal to the CAN bridge CAN communication will not actually cause any I C traffic to be transmitted on the bus Whereas requests to other nodes would cause an appropriate 1 C write read these nodes are simply handled internally This is true even
12. TR LC Data 3 4 2 I C Operation Please consult the PCA9554AD datasheet for details on 1 C operation 3 5 Joystick LEDs 0x3A Joystick AUD OZI war Figure 7 Joystick LEDs and Port Expander 2 Parts NXP Semiconductors PCA9554AD Datasheet http ics nxp com products pca datasheet pca9554 pca9554a pdf 21 SY TOTAL PHASE CANII2C Activity Board Pro User Manual The joystick and LEDs are connected to an NXP PCA9554AD port expander The microcontroller communicates with the joystick and LEDs through this port expander The joystick and LED connections to the port expander pinout are listed in Table 20 This two axis joystick is a very simple device It has five output pins up down left right and select which are asserted high when the joystick is moved to that position These outputs are then connected to an NXP I O port expander which can communicate the status over CAN and I C There are three active high LEDs controlled by the port expander D201 D202 and D303 The color of these LEDs are specified in Table 20 On startup the port expander is configured to have all joystick connections as inputs and all LED connections as outputs Table 20 Connections to Joystick LED and Port Expander 2 Pinout Pont Expander Pin Direction Connection _ F100 n _doysiek UP _ os opu Green LED 0202 3 5 1 CAN Operation The operation of the Joystick and LEDs is equivalent to that of the GP
13. ctly over 12C or over CAN through the bridge See the PCB silkscreen for the orientation of X Y and Z Please see the devices datasheet to correlate the digital reading with the physical value 3 2 1 CAN Operation Get Sensor Data The motion sensor will respond with 3 bytes of accelerometer data when a Get Sensor Data request is made See Table 12 15 Y TOTAL PHASE CANII2C Activity Board Pro User Manual Getting Sensor Data is equivalent to doing a multi byte read from the OUT_X register as described in the device datasheet Table 12 CAN Get Motion Data Payload Bye Data 2 s complement value Y acceleration 2 s complement value Z acceleration 2 s complement value Example Polling the Motion sensor See Table 13 Table 13 CAN Get Motion Data Example Transmitter CAN ID RTR DLC Data OxAA OxBB 0xCC Activity Board 0x01D Set Sensor Data Not applicable This device will not respond to Set Sensor Data requests 3 2 2 I C Operation Please consult the LIS33DE datasheet for details on 1 C operation 16 Y TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 3 Light Sensor 0x29 Figure 5 Light Sensor Part Avago Technologies ADPS 9300 Datasheet http www avagotech com docs AV02 1077EN This light sensor converts light intensity irradiance into a 16 bit digital signal It can communicate directly over 1 C or over CAN through the bridge Please see the devices da
14. der includes power ground and three analog input pins to the ADC This connector s pinout is listed in Table 7 See Section 3 6 for more details about the ADC Table 7 ADC Header J402 Pinout Pin Signal Function ADCO Input to ADC Ts eno croa 2 8 DAC Header J403 This header includes power ground and the DAC s analog output This connector s pinout is listed in Table 8 See Section 3 1 for more details about the DAC Table 8 DAC Header J403 Pinout Ping Signal Funeton 2 9 Reset Button SW301 This button resets the CAN I C Activity Board Pro microcontroller and restores the default configuration of all the peripherals 11 SY TOTAL PHASE CANII2C Activity Board Pro User Manual 2 10 Power LED D304 This green LED illuminates when the CAN I C Activity Board Pro is powered 2 11 Activity LED D305 This amber LED blinks whenever the CAN I C Activity Board Pro is processing a CAN or I C packet 12 EY TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 Targets Table 9 summarizes all the target devices and their CAN IDs I C addresses Each node can be accessed by I C or CAN In situations where the Extended CAN Opcodes are used see Table 3 follow the notes on I C operation for that device Table 9 Summary of CAN I C Activity Board Pro Target Devices 3 1 DAC 0x09 13 SY TOTAL PHASE CANII2C Activity Board Pro User Manual Figure 3 DAC
15. do CAN Interfaces and the Aardvark 2C SPI Host Adapter can be found on the Total Phase website http www totalphase com 30 SY TOTAL PHASE CAN I2C Activity Board Pro User Manual 5 Legal Contact 5 1 Disclaimer All of the software and documentation provided in this datasheet is copyright Total Phase Inc Total Phase License is granted to the user to freely use and distribute the software and documentation in complete and unaltered form provided that the purpose is to use or evaluate Total Phase products Distribution rights do not include public posting or mirroring on Internet websites Only a link to the Total Phase download area can be provided on such public websites Total Phase shall in no event be liable to any party for direct indirect special general incidental or consequential damages arising from the use of its site the software or documentation downloaded from its site or any derivative works thereof even if Total Phase or distributors have been advised of the possibility of such damage The software its documentation and any derivative works is provided on an as is basis and thus comes with absolutely no warranty either expressed or implied This disclaimer includes but is not limited to implied warranties of merchantability fitness for any particular purpose and non infringement Total Phase and distributors have no obligation to provide maintenance support or updates Information in this
16. dress of 0x42 they are individually referenced by a register address The ADC is at register address 0x01 and the LCD is at register address 0x02 Setting the ADC Value This is not applicable Attempting to set the ADC value will do nothing Getting the ADC Value Getting the ADC Value is a two step process It requires setting up the proper register address and then reading back the 3 ADC values Reading more than 3 bytes will return OxFF for any additional bytes The ADC will respond with 3 bytes of data See Table 26 Table 26 C Get ADC Data Payload 25 Y TOTAL PHASE CAN I2C Activity Board Pro User Manual Bye Daa Nos a0 cro 0 ADC Ch0 8 bit unsigned ADC Ch1 8 bit unsigned ADC Ch2 8 bit unsigned Example Polling ADC sensor See Table 27 Table 27 I C Get ADC Data Example Direction Stop Device oaa Setting the LCD Display The LCD screen is broken up into four segments of 4 characters Each data segment can be written to individually The LCD segment will also auto increment and wrap when operated in 1 C mode Therefore if segment 0x00 is selected and 8 bytes are written then the entire first line will be configured No more than 16 character bytes can be written to in a single 1 C operation See Table 28 for a description of the data payload Table 28 C Set LCD Data Payload Bye Data nos o0 Register Address 0x02 for LCD Character 0 ASCIl encoded Example W
17. o the interrupt pins of the two port expander targets See Section 3 Thus when one of these pins asserts the appropriate 1 C target will be polled and the data will be broadcast on the CAN bus 1 6 Application Notes 1 6 1 CAN Node Errors The CAN packet transmitted to the CAN I C Activity Board Pro must match one of the defined Opcode and RTR schemes defined in Section 1 4 1 If not then the packet will be ignored by the CAN bridge Additionally the Standard Opcodes will only be recognized for node IDs that are defined in Table 9 The Extended Opcodes can be used with any node ID and can thus be used to extend to other I C slaves that are not included on the CAN I C Activity Board Pro If there is ever an I C error when the CAN bridge is attempting to process an RTR packet a response will still be sent by the bridge However the DLC will be 0 and the payload will be empty SY TOTAL PHASE CANII2C Activity Board Pro User Manual 1 6 2 I C Board Configuration The CAN bridge implements an I C master in order to talk with the devices on the board However the CAN bridge is not designed to work in multi master situations In order to successfully use the CAN I C Activity Board Pro with an external master such as the Aardvark C SPI Host Adapter it is important to configure the board correctly To use the board with an 1 C master please configure the board in the following manner Disconnect the board from any CAN b
18. rame with an ID of 0x4E A CAN data frame will then be broadcast with one byte of temperature data On start up this device is configured for 9 bit temperature readings Get Sensor Data The temperature sensor will respond with 2 bytes of temperature data when a Get Sensor Data request is made See Table 32 Getting Sensor Data is equivalent to reading from the Temperature Register as described in the device datasheet Table 32 CAN Get Temperature Data Payload Byte Data Notes O o MS byte See datasheet for more information LS byte See datasheet for more information Example Polling the temperature sensor See Table 33 Table 33 CAN Get Temperature Data Example Transmitter _ Activity Board 0x04E OxAA 0xBO Set Sensor Data Not applicable This device will not respond to Set Sensor Data requests 3 7 2 I 7C Operation Please consult the DS75 datasheet for details on 1 C operation 29 SY TOTAL PHASE CAN I2C Activity Board Pro User Manual 4 References 4 1 Examples Example scripts which communicate with the target devices on the CAN I C Activity Board Pro are available for download on the Total Phase website http www totalphase com support product 4 2 Technical Specifications The CAN I C Activity Board Pro draws approximately 50 mA of current from the power source either the Komodo Interface or the Aardvark adapter Detailed information about the Technical Specifications of the Komo
19. riting Hello World to the LCD screen See Table 29 Table 29 C Set LCD Data Example Direction Stop DeviceiD oaa 26 SY TOTAL PHASE CAN I2C Activity Board Pro User Manual Write Stop 0x42 0x02 0x00 0x48 0x65 0x6c Ox6c Ox6f 0x20 0x57 Ox6f 0x72 Ox6c 0x64 0x21 0x20 Getting the LCD Display Over IC it is also possible to read out the current LCD setting Like the ADC this requires two steps The first step sets up the register we wish to read from as well as the segment to start reading from Bytes are then read consecutively out See Table 30 for a description of the data payload Table 30 C Get LCD Data Payload Byte Date roes 0 Character o ASCIvencoded Character 1 ASCll encoded Example Reading data out of LCD screen See Table 31 Table 31 C Get LCD Data Example 27 Ay TOTAL PHASE CANII2C Activity Board Pro User Manual Direcion Stop Device moa 3 7 Temperature Sensor 0x4E Tempersture SUH Ihet Figure 9 Temperature Sensor Part Maxim Integrated Products DS75 Datasheet http datasheets maxim ic com en ds DS75 pdf This temperature sensor provides temperature readings over a range of 55 C to 125 C It can communicate directly over I C or over CAN through the bridge 28 SY TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 7 1 CAN Operation To request data from the temperature sensor over CAN send a remote f
20. tasheet to correlate the digital reading with the irradiance value 3 3 1 CAN Operation Get Sensor Data The light sensor will respond with 2 bytes of irradiance value within the visible spectrum when the Get Sensor Data request is made See Table 14 17 Y TOTAL PHASE CANII2C Activity Board Pro User Manual Getting Sensor Data is equivalent to reading from the ChO light sensor as described in the device datasheet Table 14 CAN Get Light Data Payload Byte Data Notes 0 Datad low byte of irradiance value high byte of irradiance value Example Polling the light sensor See Table 15 Table 15 CAN Get Light Data Example Transmiter CANID ATA DLC Date Set Sensor Data Not applicable This device will not respond to Set Sensor Data requests 3 3 2 I C Operation Please consult the ADPS 9300 datasheet for details on 1 C operation 18 TOTAL PHASE CAN I2C Activity Board Pro User Manual 3 4 GPIO Port Expander 0x39 Port Expander PUL axi Figure 6 GPIO Port Expander Part NXP Semiconductors PCA9554AD Datasheet http ics nxp com products pca datasheet pca9554 pca9554a pdf This is an 8 pin port expander which can be accessed through CAN or I C On start up all pins are configured as inputs and can be read over CAN By communicating directly with the device over I C it is possible to configure the pins as outputs The port expanders pins are connected to a header for easy
21. us e SELO should be left open SEL1 should be left open e SEL2 should be jumped For more information on the selection pins please refer to Section 2 4 TOTAL PHASE CAN I2C Activity Board Pro User Manual 2 Connectors Headers Buttons and LEDs LAX TTR Aardvark ree E www abalphana som ooooo eh TUTE Total Pleas Ire 1 30 o o o o o amp Figure 1 CAN FC Activity Board Pro Connectors 2 1 Port Expander Header J201 This header allows the port expander to interface with external circuitry See Section 3 4 for more information 2 2 Komodo Connector J301 This connector is provided to interface with the Komodo CAN Interfaces It is a male DE 9 connector compatible with the SAE J1939 CAN CIA standard The pinout of this connector is shown in Figure 2 and Table 4 It is necessary to provide target power 4 5V 5 0V to the CAN IPC Activity Board Pro through V on the Komodo connector or through VDD on the Aardvark connector SY TOTAL PHASE CANII2C Activity Board Pro User Manual Figure 2 DE 9 Connector Pin Numbers Table 4 Komodo Connector J301 Pinout Pme Signal 6 Ne Connect e Ne Cornear Pel ve 2 3 CAN Termination Header J302 This header can be jumped to connect a 120 Ohm parallel termination resistor to the CAN bus 2 4 Select Header J303 The Selection Header provides a mechanism for changing the behavior of the CAN bridge These pins are sampled once upon reset
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