ATADAPCAN01 Datasheet ATADAPCAN01 | P1-P3

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

AT90CAN128

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 con-

nections 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

orientation.

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

pins.

STK-500ATADAPCAN01

AT90CAN128

4330B–CAN–03/04

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. Alterna-

tively, 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

Note: 1. CAN_SHLD pins are not connected together internally

CAN BUS Grounding and

Shielding

The "CAN_SHLD" signal in each of the two CAN bus connectors can be optionally con-

nected to ground by mounting 0 ohm or small value resistors in positions R2 (for D-SUB-

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 fea-

tures 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.

Signal Description D-SUB-9 pin Flat-cable Pin

Reserved 1 1

CAN_L 2 3

CAN_GND 3 5

Reserved 4 7

CAN_SHLD* 5

(1)

CAN_GND 6 2

CAN_H 7 4

Reserved 8 6

CAN_V+ 9 8

(not used) 10

P1-P3 P4-P6

ATADAPCAN01

Mfr. #:

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Description:

EXTENSION CAN ADD-ON TO STK500/1

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ATADAPCAN01