View detail for ATADAPCAN01
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.
Quick Start
STK500 starter kit, serial cable and power supply
STK501 topmodule to STK500
AVR AT90CAN128 in 64-pin TQFP package
Rev. 4330B-CAN–03/04
Connections to
STK500 / STK501
The ATADAPCAN01 module is intended for use with the STK500 and STK501 starter
kits. The STK501 holds the 64-pin TQFP ZIF socket for the AT90CAN128 part, and is a
top-module board for the AVR starter-kit STK500. The ATADAPCAN01 requires connections to the CANTx and CANRx signals on the AVR device, as well as Vcc and GND
connections. The ATADAPCAN01 board can be connected to the starter-kits in one of
three possible ways:
Individual signal wiring to PORTD. Using three 2-wire cables provided with the
STK500 kit, make the following connections:
STK500 PD5 (pin6) to ATADAPCAN01 PORTD pin 6 (CANTx)
STK500 PD6 (pin7) to ATADAPCAN01 PORTD pin 7 (CANRx)
STK500 GND & VTG to ATADAPCAN01 PORTD pins 9 & 10
Flat-cable connection to PORTD. Using a 10-wire flat-cable provided with the
STK500 kit, connect the PORTD header of the STK500 to the PORTD header of the
ATADAPCAN01, as shown in figure 1. Care should be taken to use the correct pin
Figure 1. Connecting to the STK500 through a 10-wire flat-cable
Direct mounting onto PORTD. A second PORTD header is routed (but not mounted) on
the ATADAPCAN01 (J8). By attaching a matching 10 pin socket to the underside of the
board, it can be mounted directly onto the STK500 PORTD header. The top-side
PORTD header on the ATADAPCAN01 board can then be used to access other PORTD
CAN Bus Interface
Several options are available to physically connect the ATADAPCAN01 to a CAN bus.
BUS Connectors
The D-SUB-9 MALE connector is the primary connection point to a CAN bus. Alternatively, the 10-pin header labelled "CAN BUS flat-cable" can be used, or both connectors
can be used if the CAN bus topology requires it. Both connectors are wired according to
CiA Draft Standard 102 version 2.0 as shown in table 1.
Table 1. CAN Bus Connector Wiring
Signal Description
D-SUB-9 pin
Flat-cable Pin
(not used)
1. CAN_SHLD pins are not connected together internally
CAN BUS Grounding and The "CAN_SHLD" signal in each of the two CAN bus connectors can be optionally connected to ground by mounting 0 ohm or small value resistors in positions R2 (for D-SUBShielding
9) and R3 (for flat-cable). The landing pads of both R2 and R3 are 1206 standard size.
By default, the "CAN_GND" signals in both connectors are wired to the STK500 ground
through 0 ohm resistor R1. Removing R1 will isolate the "CAN_GND" ground signals on
the CAN bus from the STK500 / ATADAPCAN01 ground.
CAN BUS Termination
To function correctly, a CAN bus requires 120 ohm termination on both ends. The
ATADAPCAN01 can become a terminated node on the CAN bus simply by setting the
jumper labelled "TERM". This terminates the CAN bus with two series-connected 62
ohm resistors. Setting the jumper labelled "SPLIT" connects the centre-tap between
these two resistors to ground through 10nF capacitor C1. This reduces common-mode
noise on the bus line. This centre tap can also be stabilised as described later in the
”Split voltage” section (if supported by the CAN transceiver mounted in "CAN1").
CAN Transceiver Options The ATADAPCAN01 board has two CAN transceiver footprints. This is to facilitate easy
evaluation of alternate CAN devices as well as to provide access to various extra features of some of these parts. Refer to the schematic diagram in Figure 2 (below) while
considering these options.
Both "CAN1" and "CAN2" footprints use standard CAN device pinouts for pins 1, 2, 3, 4,
6 and 7. By default, "CAN1" is mounted on the board (Atmel ATA6660). To use a device
in "CAN2", solder the device to the board, and remove the 0 ohm ’resistors’ labelled R8,
R9 R10 from the "CAN1" section, and mount them into the "CAN2" section in positions
R11, R12, R13. Although it is acceptable that idle CAN transceivers remain attached to
the CAN bus, only one CAN device should be connected to the AVR device at any time.
Figure 2. Component Placement
Utilising CANTransceiver Extrafeatures
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 termination 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 documentation 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,
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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