AMIS-42770 ONSEMI | Alldatasheet
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© Semiconductor Components Industries, LLC, 2009 January, 2009 − Rev. 3
1 Publication Order Number:
AMIS−42770/D AMIS-42770 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−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 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) 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. Key Features
- Fully Compatible with the ISO 11898−2 Standard
- Certified “Authentication on CAN Transceiver Conformance (d1.1)”
- Wide Range of Bus Communication Speed (up to 1 Mbit/s in Function of the Bus Topology)
- Allows Low Transmit Data Rate in Networks Exceeding 1 km
- 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
- Prolonged Dominant Time−out Function Allowing Communication Speeds Down to 1 kbit/s
- Thermal Protection
- Bus Pins Protected against Transients
- Short Circuit Proof to Supply V oltage and Ground
- This is a Pb−Free Device* *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. SOIC 20 IC SUFFIX CASE 751AQ http://onsemi.com See detailed ordering and shipping information in the package dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
AMIS−42770 http://onsemi.com Part Number Package Shipping Configuration Temperature Range AMIS42770ICAW1G SOIC−20 300 GREEN Tube/Tray −40°C to 125°C AMIS42770ICAW1RG SOIC−20 300 GREEN Tape & Reel −40°C to 125°C Table 1. TECHNICAL CHARACTERISTICS
- The parameters V CM−peak and VCM−step guarantee low EME.
Figure 1. Block Diagram
- Dual CAN
- A CAN−bus extender
- A CAN−bus repeater Application Schematics AMIS−42770 Text Rx0 Tx0 Rint
4 CANH2
5 V−reg
Figure 2. Application Diagram CAN−bus Repeater Figure 3. Application Diagram Dual−CAN
Figure 4. Application Diagram CAN−bus Extender Figure 5. Pin Out (top view)
Table 2. PIN DESCRIPTION
1 NC Not connected
2 ENB2 Enable input, bus system 2; internal pull−up
3 Text Multi−system transmitter Input; internal pull−up
4 Tx0 Transmitter input; internal pull−up
5 GND Ground connection (Note 2)
6 GND Ground connection (Note 2)
7 Rx0 Receiver output
8 VREF1 Reference voltage
9 Rint Multi−system receiver output
10 ENB1 Enable input, bus system 1; internal pull−up
11 NC Not connected
12 VCC Positive supply voltage
13 CANH1 CANH transceiver I/O bus system 1
14 CANL1 CANL transceiver I/O bus system 1
15 GND Ground connection (Note 2)
16 GND Ground connection (Note 2)
17 GND Ground connection (Note 2)
18 CANL2 CANL transceiver I/O bus system 2
19 CANH2 CANH transceiver I/O bus system 2
20 NC Not connected
- In order to ensure the chip performance, all these pins need to be connected to GND on the PCB.
corresponding driving and receiving sections are provided. bus to all nodes connected to either of them. sections of all transceivers connected to the bus are passive. bus lines, it remains limited to that bus line where it occurs. system and on this bus system itself can be continued. open it serves as a single transceiver for an electronic unit. bus by the proper termination resistor. unit is described in Table 3. interface; a recessive state is represented by a high−level. dominant state on both busses, pin Rint and pin Rx0. transmission of dominant on both bus lines (if enabled). and Rint pins, dominant on Text is only transferred to Rx0.
short circuit to either positive supply voltage or to ground. Additionally a thermal protection circuit is integrated. switched on and off with a controlled slope to limit EME. protection circuit, the timer circuit and the logic unit. Table 3. FUNCTION OF THE LOGIC UNIT (bold letters describe input signals)
- Dominant detected by the corresponding receiver.
identical to the comparator output signal. it is replaced by a recessive signal on the timer output.
AMIS−42770 http://onsemi.com Feedback Suppression The logic unit described in Table 3 constantly ensures that dominant symbols on one bus line are transmitted to the other bus line without imposing any priority on either of the lines. This feature would lead to an “interlock” state with permanent dominant signal transmitted to both bus lines, if no extra measure is taken. Therefore feedback suppression is included inside the logic unit of the transceiver. This block masks−out reception on that bus line, on which a dominant is actively transmitted. The reception becomes active again only with certain delay after the dominant transmission on this line is finished. Power−on−Reset (POR) While Vcc voltage is below the POR level, the POR circuit makes sure that:
- The counters are kept in the reset mode and stable state without current consumption
- Inputs are disabled (don’t care)
- Outputs are high impedant; only Rx0 = high−level
- Analog blocks are in power down
- Oscillator not running and in power down
- CANHx and CANLx are recessive
- VREF output high impedant for POR not released Over Temperature Detection A thermal protection circuit is integrated to prevent the transceiver from damage if the junction temperature exceeds thermal shutdown level. Because the transmitters dissipate most of the total power, the transmitters will be switched off only to reduce power dissipation and IC temperature. All other IC functions continue to operate. Fault Behavior A fault like a short circuit is limited to that bus line where it occurs; hence data interchange from the protocol IC to the other bus system is not affected. When the voltage at the bus lines is going out of the normal operating range (−12 V to +12 V), the receiver is not allowed to erroneously detect a dominant state. Short Circuits A current−limiting circuit protects the transmitter output stage from damage caused by an accidental short−circuit to either positive or negative supply voltage, although power dissipation increases during this fault condition. The pins CANHx and CANLx are protected from automotive electrical transients (according to “ISO 7637”).
ELECTRICAL CHARACTERISTICS
All voltages are referenced to GND. Positive currents flow into the IC. Sinking current means that the current is flowing into the pin. Sourcing current means that the current is flowing out of the pin. Table 4. ABSOLUTE MAXIMUM RATINGS
- Applied transient waveforms in accordance with “ISO 7637 part 3”, test pulses 1, 2, 3a, and 3b (see Figure 6)
- Standardized human body model (HBM) ESD pulses in accordance to MIL883 method 3015. Supply pin 8 is ±2 kV.
- Static latch −up immunity: static latch−up protection level when tested according to EIA/JESD78.
- Standardized charged device model ESD pulses when tested according to EOS/ESD DS5.3 −1993.
Table 5. THERMAL CHARACTERISTICS Table 6. DC AND TIMING CHARACTERISTICS
Figure 11. Common−mode Voltage Peaks (see Measurement Set−up Figure 10) For more information about ON Semiconductor’s products or services visit our Web site at http://www.onsemi.com.
AMIS−42770 http://onsemi.com PACKAGE DIMENSIONS SOIC 20 W CASE 751AQ−01 ISSUE O ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5773−3850 AMIS−42770/D LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative