ATADAPCAN01 ATMEL | Alldatasheet
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ATADAPCAN01 - STK501 CAN Extension The ATADAPCAN01 - STK501 CAN add-on is an extension to the STK500 and STK501 development boards from Atmel Corporation, adding support for the AVR AT90CAN128 device in a single development environment. The AVR AT90CAN128 includes a built-in Controller Area Network (CAN) controller with all the features required to implement the CAN serial communication protocol in accordance with the “BOSCH GmbH” CAN specification. The add-on board provides CAN transceivers, termination options and other features necessary to seamlessly connect the STK500 development environment to a CAN bus for application development and debugging. Requirements STK500 starter kit, serial cable and power supply STK501 topmodule to STK500 AVR AT90CAN128 in 64-pin TQFP package Rev. 4330B-CAN–03/04 CAN Microcontrollers Quick Start Guide
Figure 1. Connecting to the STK500 through a 10-wire flat-cable
CAN Bus Interface Several options are available to physically connect the ATADAPCAN01 to a CAN bus. CiA Draft Standard 102 version 2.0 as shown in table 1. Table 1. CAN Bus Connector Wiring 9) and R3 (for flat-cable). The landing pads of both R2 and R3 are 1206 standard size. the CAN bus from the STK500 / ATADAPCAN01 ground. ”Split voltage” section (if supported by the CAN transceiver mounted in "CAN1"). the CAN bus, only one CAN device should be connected to the AVR device at any time.
4330B–CAN–03/04 Figure 2. Component Placement
features
Many CAN transceiver devices available have various extra functions accessible through pins 5 and 8. The ATADAPCAN01 allows you to take advantage of some of these features. Pin 8 on both "CAN1" and "CAN2" footprints are connected centre pin of the "SLOPE CTRL" connector. Pin 5 of "CAN1" is connected to the centre-tap of the ter- mination network, and pin 5 of "CAN2" is connected to R6 and C2 as shown in Figure 2. Slope Control (pin 8, "CAN1" and "CAN2") CAN transceivers supporting slope or slew-rate control allow a resistor to be connected between the RS pin (pin 8) and ground to limit the slope of the bus-driving signal. This reduced EMI emmissions while restricting the maximum transmission rate. Pin 8 on both "CAN1" and "CAN2" devices are connected to the centre pin of the "SLOPE CTRL" jumper. Setting the jumper to the ON position, connects the centre pin to ground through resistor R7, while setting it to the OFF position connects the centre pin directly to ground (for no slope control, or high-speed mode). Refer to the CAN transceiver device docu- mentation for information on selecting the value of R7 (24k by default). Standby Function (pin 8, "CAN1" and "CAN2") On some CAN transceivers, pin 8 can be driven by a logic level to switch the transceiver into standby mode. The centre pin of the "SLOPE CTRL" header (with the jumper removed) can be connected to an I/O pin on the AVR device for this purpose. Your AVR code should drive this signal as specified in the CAN transceiver documentation. Shutdown Function (pin 5, "CAN2") Some CAN transceivers have a SHUTDOWN function which is configured by an R-C connection on pin 5. Pin 5 of the "CAN2" footprint is connected to resistor R6 to Vcc and capacitor C2 to ground, as shown in the schematic diagram. By default R6 is a 0 ohm connection to Vcc and C2 is not mounted. Both parts are 0603 size. Consult the CAN transceiver documentation for further information. Split Voltage (pin 5, "CAN1") The centre-point of the CAN bus termination (if enabled) can be stabilised by connecting it to pin 5 of certain CAN transceivers. If the CAN transceiver supports this feature, a 0 ohm 0603 resistor can be mounted in R14, with the "SPLIT" and "TERM" jumpers set accordingly (see Section ”CAN bus termination”).
Figure 3. Schematic Layout
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