AMIS-4168x Fault Tolerant CAN Transceiver
Data Sheet
1.0 General Description
The new AMIS-41682 and AMIS-41683 are interfaces between the protocol controller and the physical wires of the bus lines in a
control area network (CAN). AMIS-41683 is identical to the AMIS-41682 but has a true 3.3V digital interface to the CAN controller.
The device provides differential transmit capability but will switch in error conditions to a single-wire transmitter and/or receiver.
Initially it will be used for low speed applications, up to 125kBaud, in passenger cars.
Both AMIS-41682 and AMIS-41683 are implemented in I2T100 technology enabling both high-voltage analog circuitry and digital
functionality to co-exist on the same chip.
These products consolidate the expertise of AMIS for in-car multiplex transceivers and support together with AMIS-30522 (VAN),
AMIS-30660 and AMIS-30663 (CAN High Speed) and AMIS-30600 (LIN) another widely used physical layer.
2.0 Key Features
•
Fully compatible with ISO11898-3 standard
•
Optimized for in-car low-speed communication
o
Baud rate up to 125kBaud
o
Up to 32 nodes can be connected
o
Due to built-in slope control function and a very good matching of the CANL and CANH bus outputs, this device realizes a
very low electromagnetic emission (EME)
o
Fully integrated receiver filters
o
Permanent dominant monitoring of transmit data input
o
Differential receiver with wide common-mode range for high electromagnetic susceptibility (EMS) in normal- and low-power
modes
o
True 3.3V digital I/O interface to CAN controller for AMIS-41683 only
•
Management in case of bus failure
o
In the event of bus failures, automatic switching to single-wire mode, even when the CANH bus wire is short circuited to
VCC
o
The device will automatically reset to differential mode if the bus failure is removed
o
During failure modes there is full wake-up capability.
o
Un-powered nodes do not disturb bus lines
o
Bus errors and thermal shutdown activation is flagged on ERRB pin
•
Protection issues
o
Short circuit proof to battery and ground
o
Thermal protection
o
The bus lines are protected against transients in an automotive environment
o
An un-powered node does not disturb the bus lines
•
Support for low power modes
o
Low current sleep and standby mode with wake-up via the bus lines
o
Power-on flag on the output
o
Two-edge sensitive wake-up input signal via pin WAKEB
•
IOs
o
The un-powered chip cannot be parasitically supplied either from digital inputs nor from digital outputs.
3.0 Technical Characteristics
Table 1: Technical Characteristics
Symbol
Parameter
V
CANH
DC voltage at pin CANH, CANL
Vbat
Voltage at pin Vbat
Conditions
0 < VCC < 5.25V; no time limit
Load-dump
Min
-40
Max
+40
+40
Unit
V
V
AMI Semiconductor –
Rev. 2.0 – Feb. 07
www.amis.com
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AMI [ AMI SEMICONDUCTOR ]
