©2008 SCILLC. All rights reserved.

Publication Order Number:

June 2008 – Rev. 4

4168x/D

AMIS-4168x

Fault Tolerant CAN Transceiver

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

•

I/Os

The un-powered chip cannot be parasitically supplied either from digital inputs or from digital outputs