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參數(shù)資料
| 型號(hào)： | 0ICAG-001-XTP |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | DATACOM, INTERFACE CIRCUIT, PDSO8 |
| 封裝： | 0.150 INCH, GREEN, PLASTIC, SOIC-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 521K |
| 代理商： | 0ICAG-001-XTP |
AMIS-42673 High Speed CAN Transceiver
Data Sheet
For Long Networks
7.0 Functional Description
7.1 General
The AMIS-42673 is the interface between the CAN protocol controller and the physical bus. It is intended for use in industrial and
automotive applications requiring baud rates up to 1Mbit/s. It provides differential transmit capability to the bus and differential receiver
capability to the CAN protocol controller. It is fully compatible to the “ISO 11898-2” standard.
7.2 Operating Modes
AMIS-42673 only operates in high-speed mode as illustrated in Table 3.
The transceiver is able to communicate via the bus lines. The signals are transmitted and received to the CAN controller via the pins
TxD and RxD. The slopes on the bus lines outputs are optimised to give extremely low EME.
Table 3: Functional table of AMIS-42673; X = don’t care
VCC
pin TxD
pin CANH
pin CANL
Bus state
pin RxD
4.75 to 5.25.V
0
High
Low
Dominant
0
4.75 to 5.25.V
1 (or floating)
VCC/2
Recessive
1
VCC<PORL (unpowered)
X
0V<CANH<VCC
0V<CANL<VCC
Recessive
1
PORL<VCC<4.75V
>2V
0V<CANH<VCC
0V<CANL<VCC
Recessive
1
7.3 Over-temperature Detection
A thermal protection circuit protects the IC from damage by switching off the transmitter if the junction temperature exceeds a value of
approximately 160°C. Because the transmitter dissipates most of the power, the power dissipation and temperature of the IC is
reduced. All other IC functions continue to operate. The transmitter off-state resets when pin TxD goes HIGH. The thermal protection
circuit is particularly needed when a bus line short circuits.
7.4 High Communication Speed Range
The transceiver is primarily intended for industrial applications. It allows very low baud rates needed for long bus length applications.
But also high speed communication is possible up to 1Mbit/s.
7.5 Fail-safe Features
A current-limiting circuit protects the transmitter output stage from damage caused by accidental short-circuit to either positive or
negative supply voltage - although power dissipation increases during this fault condition.
The pins CANH and CANL are protected from automotive electrical transients (according to “ISO 7637”; see Figure 4).
Should TxD become disconnected, this pin is pulled high internally.
When the Vcc supply is removed, pins TxD and RxD will be floating. This prevents the AMIS-42673 from being supplied by the CAN
controller through the I/O pins.
7.6 3.3V Interface
AMIS-42673 may be used to interface with 3.3V or 5V controllers by use of the V33 pin. This pin may be supplied with 3.3V or 5V to
have the corresponding digital interface voltage levels.
When the V33 pin is supplied at 2.5V, even interfacing with 2.5V CAN controllers is possible. See also Digital Output Characteristics @
V33 = 2.5V, Table 7. In this case a pull-up resistor from TxD to V33 is necessary.
4
AMI Semiconductor – October 07, Rev. 1.0
www.amis.com
Specifications subject to change without notice
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