AMIS-42770 Dual High-Speed CAN Transceiver
For Long Networks
1.0 General Description
Data Sheet
Controller Area Network (CAN) is a serial communication protocol, which supports distributed real-time control and multiplexing
with high safety level. Typical applications of CAN-based networks can be found in automotive and industrial environments.
The AMIS-42770 Dual-CAN transceiver is the interface between up to two physical bus lines and the protocol controller and will be
used for serial data interchange between different electronic units at more than one bus line. It can be used for both 12V and 24V
systems.
The circuit consists of following blocks:
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Two differential line transmitters
Two differential line receivers
Interface to the CAN protocol handler
Interface to expand the number of CAN busses
Logic block including repeater function and the feedback suppression
Thermal shutdown circuit (TSD)
Due to the wide common-mode voltage range of the receiver inputs, the AMIS-42770 is able to reach outstanding levels of
electromagnetic susceptibility (EMS). Similarly, extremely low electromagnetic emission (EME) is achieved by the excellent
matching of the output signals.
2.0 Key Features
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Fully compatible with the ISO 11898-2 standard
Certified “Authentication on CAN Transceiver Conformance (d1.1)”
Wide range of bus communication speed (up to 1Mbit/s in function of the bus topology)
Allows low transmit data rate in networks exceeding 1km
Ideally suited for 12V and 24V industrial and automotive applications
Low EME: common-mode-choke is no longer required
Differential receiver with wide common-mode range (+/- 35V) for high EMS
No disturbance of the bus lines with an un-powered node
Prolonged dominant time-out function allowing communication speeds down to 1kbit/s
Thermal protection
Bus pins protected against transients
Short circuit proof to supply voltage and ground
3.0 Technical Characteristics
Table 1: Technical Characteristics
Symbol
Parameter
DC voltage at pin CANH1/2
V
CANHx
DC voltage at pin CANL1/2
V
CANLx
Differential bus output voltage in dominant state
V
i(dif)(bus_dom)
CM-range
Input common-mode range for comparator
Common-mode peak
Common-mode step
V
CM-peak
V
CM-step
Note:
Conditions
0 < V
CC
< 5.25V; no time limit
0 < V
CC
< 5.25V; no time limit
42.5Ω < R
LT
< 60Ω
Guaranteed differential receiver threshold and
leakage current
See Figure 10 and Figure 11
See Figure 10 and Figure 11
Min.
-45
-45
1.5
-35
-1000
-250
Max.
+45
+45
3
+35
1000
250
Unit
V
V
V
V
mV
mV
(1) The parameters V
CM-peak
and V
CM-step
guarantee low EME.
AMI Semiconductor
– October 2007, Rev. 1.0
www.amis.com
Specifications subject to change without notice
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AMI [ AMI SEMICONDUCTOR ]
