PDF AMIS-42700 Data sheet ( Hoja de datos )

Número de pieza	AMIS-42700
Descripción	Dual High Speed CAN Transceiver
Fabricantes	ON Semiconductor
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No Preview Available ! AMIS-42700 Dual High Speed CAN Transceiver General Description 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−42700 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 12 V and 24 V systems. The circuit consists of following blocks: • 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) • Short to battery treatment circuit Due to the wide common−mode voltage range of the receiver inputs, the AMIS−42700 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. Key Features • Fully compatible with the ISO 11898−2 standard www.Dat•aSCheeertt4ifUie.cdom“Authentication on CAN Transceiver Conformance (d1.1)” • High speed (up to 1 Mbit/s in function of the bus topology) • Ideally suited for 12 V and 24 V industrial and automotive applications • Low EME common−mode−choke is no longer required • Differential receiver with wide common−mode range (±35 V) for high EMS • No disturbance of the bus lines with an un−powered node • Dominant time−out function • Thermal protection • Bus pins protected against transients in an automotive environment • Short circuit proof to supply voltage and ground http://onsemi.com PIN CONFIGURATION NC 1 EN2 2 Text 3 Tx0 4 GND 5 GND 6 Rx0 7 Vref1 8 Rint 9 EN1 10 20 NC 19 CANH2 18 CANL2 17 GND 16 GND 15 GND 14 CANL1 13 CANH1 12 VCC 11 NC SOIC 20 WC SUFFIX CASE 751AQ ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. © Semiconductor Components Industries, LLC, 2009 January, 2009 − Rev. 5 1 Publication Order Number: AMIS−42700/D 1 page AMIS−42700 Functional Description Overall Functional Description AMIS−42700 is specially designed to provide the link between the protocol IC (CAN controller) and two physical bus lines. Data interchange between those two bus lines is realized via the logic unit inside the chip. To provide an independent switch−off of the transceiver units for both bus systems by a third device (e.g. the mC), enable−inputs for the corresponding driving and receiving sections are provided. As long as both lines are enabled, they appear as one logical bus to all nodes connected to either of them. The bus lines can have two logical states, dominant or recessive. A bus is in the recessive state when the driving sections of all transceivers connected to the bus are passive. The differential voltage between the two wires is approximately zero. If at least one driver is active, the bus changes into the dominant state. This state is represented by a differential voltage greater than a minimum threshold and therefore by a current flow through the terminating resistors of the bus line. The recessive state is overwritten by the dominant state. In case of a fault (like short circuit) is present on one of the bus lines, it remains limited to that bus line where it occurs. Data interchange from the protocol IC to the other bus system and on this bus system itself can be continued. AMIS−42700 can be also used for only one bus system. If the connections for the second bus system are simply left open it serves as a single transceiver for an electronic unit. For correct operation, it is necessary to terminate the open bus by the proper termination resistor. Logic Unit and CAN Controller Interface The logic unit inside AMIS−42700 provides data transfer from/to the digital interface to/from the two busses and from one bus to the other bus. The detailed function of the logic unit is described in Table 3. www.DataSAhelletd4iUg.ictaolminput pins, including ENBx, have an internal pull-up resistor to ensure a recessive state when the input is not connected or is accidentally interrupted. A dominant state on the bus line is represented by a low-level at the digital interface; a recessive state is represented by a high-level. Dominant state received on any bus (if enabled) causes a dominant state on both busses, pin Rint and pin Rx0. Dominant signal on any of the input pins Tx0 and Text causes transmission of dominant on both bus lines (if enabled). Digital inputs Tx0 and Text are used for connecting the internal logic’s of several IC’s to obtain versions with more than two bus outputs (see Figure 4: Application Diagram CAN-bus Extender). They have also a direct logical link to pins Rx0 and Rint independently on the EN1x pins − dominant on Tx0 is directly transferred to both Rx0 and Rint pins, dominant on Text is only transferred to Rx0. Transmitters The transceiver includes two transmitters, one for each bus line, and a driver control circuit. Each transmitter is implemented as a push and a pull driver. The drivers will be active if the transmission of a dominant bit is required. During the transmission of a recessive bit all drivers are passive. The transmitters have a built−in current limiting circuit that protects the driver stages from damage caused by accidental short circuit to either positive supply voltage or to ground. Additionally a thermal protection circuit is integrated. The driver control circuit ensures that the drivers are switched on and off with a controlled slope to limit EME. The driver control circuit will be controlled itself by the thermal protection circuit, the timer circuit and the logic unit. The enable signal ENBx allows the transmitter to be switched off by a third device (e.g. the mC). In the disabled state (ENBx = high) the corresponding transmitter behaves as in the recessive state. Table 3. Function of the Logic Unit (bold letters describe input signals) EN1B EN2B TX0 TEXT Bus 1 State 0 0 0 0 dominant 0 0 0 1 dominant 0 0 1 0 dominant 0 0 1 1 recessive 0 0 1 1 dominant (Note 3) 0 0 1 1 dominant 01 0 0 01 0 1 01 1 0 01 1 1 01 1 1 3. Dominant detected by the corresponding receiver. dominant dominant dominant recessive dominant (Note 3) Bus 2 State dominant dominant dominant recessive dominant dominant (Note 3) recessive recessive recessive recessive recessive RX0 0 0 0 1 0 0 0 0 0 1 0 RINT 0 0 1 1 0 0 0 0 1 1 0 http://onsemi.com 5 5 Page Tx0/ Text CANHx AMIS−42700 +5V 100 nF VCC 12 Text 3 Vref 8 13 CANH1 Rint Tx0 9 14 CANL1 AMIS−42700 19 CANH2 4 Rx0 7 10 2 17 16 15 6 518 CANL2 EN1 EN2 GND RLT 60 W RLT 60 W Figure 7. Test Circuit for Timing Characteristics CLT 100 pF CLT 100 pF HIGH LOW CANLx Vi(dif) = VCANH −VCANL 0,9V Rx0/ Rint td(Tx−Rx) www.DataShtde(Text−4BUUS.ocno) m 0,3 x VCC 0,5V 0,9V 0,7 x VCC 0,3 x VCC td(Tx−Rx) td(Tx−BUSoff) td(BUSon−Rx) Figure 8. Timing Diagram for AC Characteristics 0,5V dominant recessive 0,7 x VCC td(BUSoff−Rx) http://onsemi.com 11 11 Page

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