Figure 2. Component Placement
Utilising CAN-
Transceiver Extra-
features
Slope Control (pin 8,
"CAN1" and "CAN2")
Standby Function (pin 8,
"CAN1" and "CAN2")
Shutdown Function
(pin 5, "CAN2")
Split Voltage (pin 5,
"CAN1")
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.
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).
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.
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.
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”).
4
AT90CAN128
4330B–CAN–03/04
相关PDF资料
ATAVRBC100 REF DESIGN KIT BATTERY CHARGER
ATAVRDB101 MODULE DISPLAY LCD/RGB BACKLIGHT
ATAVRMC100 KIT EVALUATION FOR AT90PWM3
ATAVRMC200 KIT EVAL FOR AT90PWM3 ASYNC
ATAVRMC300 BOARD EVAL LV MOTOR CONTROL PWR
ATAVRMC303 BOARD EVAL MOTOR CTRL W/XMEGA
ATAVRMC320 KIT EVAL MOTOR CTRL CAN/LIN
ATAVRSB100 SMART BATTERY DEVELOPMENT KIT
相关代理商/技术参数
ATADAPMEGA162 功能描述:子卡和OEM板 ADAPTER FOR ICE50 MEGA-ATMEGA8515/162 RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
ATADAPMEGA169 功能描述:ADAPTER PERSON ICE50 ATMEGA169 RoHS:否 类别:编程器,开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035
ATADAPMEGA32 功能描述:子卡和OEM板 ADAPTER F/ICE50 MEGA ATMEGA8535/16/32 RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
ATADAPMEGA8 功能描述:子卡和OEM板 ADAPTER FOR ICE50 MEGA - ATMEGA8 PDIP RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
ATADAPT2313 功能描述:子卡和OEM板 ADAPTER FOR ICE50 TINY2313 RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
ATADAPTCAN01 制造商:Atmel Corporation 功能描述:STK501 CANN ADD-ON - Bulk
ATADAPTEST 功能描述:子卡和OEM板 ADAPTER FOR ICE50 TEST RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
ATADAPTINY13 功能描述:子卡和OEM板 ADAPTER FOR ICE50 TINY13IP RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit