AMIS42671ICAB1RG

AMIS-42671 High Speed Autobaud CAN Transceiver General Description • • • • • • • • • • PIN ASSIGNMENT TxD 1 8 AUTB GND 2 7 CANH VCC 3 6 CANL RxD 4 5 VREF PC20070929.1 (Top View) Features • • • • • http://onsemi.com AMIS− 42671 The AMIS−42671 CAN transceiver with autobaud is the interface between a controller area network (CAN) protocol controller and the physical bus. It may be used in both 12 V and 24 V systems. The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. Due to the wide common−mode voltage range of the receiver inputs, the AMIS−42671 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. The AMIS−42671 is primarily intended for industrial network applications where long network lengths are mandatory. Examples are elevators, in−building networks, process control and trains. To cope with the long bus delay the communication speed needs to be low. AMIS−42671 allows low transmit data rates down 10 kbit/s or lower. The autobaud function allows the CAN controller to determine the incoming baud rate without influencing the CAN communication on the bus. Fully compatible with the ISO 11898−2 standard Autobaud function Wide range of bus communication speed (0 up to 1 Mbit/s) Allows low transmit data rate in networks exceeding 1 km Ideally suited for 12 V and 24 V industrial and automotive applications Low electromagnetic emission (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 Thermal protection Bus pins protected against transients Silent mode in which the transmitter is disabled Short circuit proof to supply voltage and ground Logic level inputs compatible with 3.3 V devices ESD protection for CAN bus at $8 kV These are Pb−Free Devices* ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2009 January, 2009 − Rev. 3 1 Publication Order Number: AMIS−42671/D AMIS−42671 Table 1. TECHNICAL CHARACTERISTICS Max Max Unit VCANH Symbol DC Voltage at Pin CANH Parameter 0 < VCC < 5.25V; no time limit Condition −45 +45 V VCANL DC Voltage at Pin CANL 0 < VCC < 5.25V; no time limit −45 +45 V Vo(dif)(bus_dom) Differential Bus Output Voltage in Dominant State 42.5W < RLT < 60W 1.5 3 V tpd(rec−dom) Propagation Delay TxD to RxD See Figure 7 70 245 ns tpd(dom−rec) Propagation Delay TxD to RxD See Figure 7 100 245 ns CM−range Input Common−Mode Range for Comparator −35 +35 V VCM−peak Common−Mode Peak See Figures 8 and 9 (Note 1) −500 500 mV VCM−step Common−Mode Step See Figures 8 and 9 (Note 1) −150 150 mV Guaranteed differential receiver threshold and leakage current 1. The parameters VCM−peak and VCM−step guarantee low electromagnetic emission. http://onsemi.com 2 AMIS−42671 VCC AUTB 8 3 Thermal shutdown VCC TxD Slope Control 1 7 Driver control 6 Autobaud Control RxD 4 AMIS−42671 COMP Ri(cm) Vcc/2 + VREF 5 Ri(cm) 2 PC20070930.2 Figure 1. Block Diagram GND Table 2. PIN DESCRIPTION Pin Name Description 1 TxD Transmit Data Input; Low Input → Dominant Driver; Internal Pullup Current 2 GND Ground 3 VCC Supply Voltage 4 RxD Receive Data Output; Dominant Transmitter → Low Output 5 VREF Reference Voltage Output 6 CANL Low−Level CAN Bus Line (Low in Dominant Mode) 7 CANH High−Level CAN Bus Line (High in Dominant Mode) 8 AUTB Autobaud Mode Control Input; Internal Pulldown Current http://onsemi.com 3 CANH CANL AMIS−42671 Table 3. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Min Max Unit −0.3 +7 V 0 < VCC < 5.25 V; No Time limit −45 +45 V 0 < VCC < 5.25 V; No Time Limit −45 +45 V DC Voltage at Pin TxD −0.3 VCC + 0.3 V VRxD DC Voltage at Pin RxD −0.3 VCC + 0.3 V VAUTB DC Voltage at Pin AUTB −0.3 VCC + 0.3 V VREF DC Voltage at Pin VREF −0.3 VCC + 0.3 V Vtran(CANH) Transient Voltage at Pin CANH Note 2 −150 +150 V Vtran(CANL) Transient Voltage at Pin CANL Note 2 −150 +150 V Vesd Electrostatic Discharge Voltage at All Pins Note 3 Note 4 −4 −500 +4 +500 kV V Latch−up Static Latch−up at all Pins Note 5 100 mA Tstg Storage Temperature −55 +155 °C TA Ambient Temperature −40 +125 °C TJ Maximum Junction Temperature −40 +150 °C VCC Supply Voltage VCANH DC Voltage at Pin CANH VCANL DC Voltage at Pin CANL VTxD Conditions Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 2. Applied transient waveforms in accordance with ISO 7637 part 3, test pulses 1, 2, 3a, and 3b (see Figure 3). 3. Standardized human body model ESD pulses in accordance to MIL883 method 3015.7. 4. Static latch−up immunity: static latch−up protection level when tested according to EIA/JESD78. 5. Standardized charged device model ESD pulses when tested according to EOS/ESD DS5.3−1993. Table 4. THERMAL CHARACTERISTICS Symbol Parameter Conditions Value Unit Rth(vj−a) Thermal Resistance from Junction−to−Ambient in SO−8 package In Free Air 150 k/W Rth(vj−s) Thermal Resistance from Junction−to−Substrate of Bare Die In Free Air 45 k/W http://onsemi.com 4 AMIS−42671 APPLICATION INFORMATION VBAT IN 5V−reg 60 W OUT VCC 47 nF VCC AUTB CAN controller RxD TxD 3 8 4 7 AMIS− 42671 5 6 1 GND Figure 2. Application Diagram http://onsemi.com 5 CANH VREF CAN BUS CANL 60 W 2 PC20071001.1 60 W GND 60 W 47 nF AMIS−42671 FUNCTIONAL DESCRIPTION Operating Modes The behavior of AMIS−42671 under various conditions is illustrated in Table 5 below. In case the device is powered, one of two operating modes can be selected through Pin AUTB. Table 5. FUNCTIONAL TABLE OF AMIS−42671 WHEN NOT CONNECTED TO THE BUS; x = don’t care VCC Pin TxD Pin AUTB Pin CANH Pin CANL Bus State Pin RxD 4.75 to 5.25 V 0 0 (or floating) High Low Dominant 0 4.75 to 5.25 V 1 (or floating) 1 VCC/2 VCC/2 Recessive 1 4.75 to 5.25 V 1 (or floating) x VCC/2 VCC/2 Recessive 1 VCC < PORL (unpowered) x x 0 V < CANH < VCC 0V < CANL < VCC Recessive 1 >2 V x 0 V < CANH < VCC 0V < CANL < VCC Recessive 1 PORL < VCC < 4.75 V High−Speed Mode Autobaud Mode If pin AUTB is pulled low (or left floating), the transceiver is in its high−speed mode and 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 line outputs are optimized to give extremely low electromagnetic emissions. If Pin AUTB is pulled high, AMIS−42671 is in Autobaud mode. The transmitter is disabled while the receiver remains active. All other IC functions also continue to operate. Normal bus activity can be monitored at the RxD pin and transmit data on TxD is looped back to RxD without influencing the CAN communication. TxD CANH CANL RxD AUTB PC20071002.4 Figure 3. Simplified Schematic Diagram of Autobaud Function Overtemperature Detection In Autobaud mode the local CAN controller is able to detect the used communication speed of other transmitting network nodes. Bus communication is received and via the RxD pin sent to the CAN controller. If the CAN controller operates at the wrong baud rate, it will transmit an error frame. This message will be looped back to the CAN controller which will increment its error counter. The CAN controller will be reset with another baud rate. When an error−free message is received, the correct baud rate is detected. A logic low may now be applied to Pin AUTB, returning to the high−speed mode. 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 necessary when a bus line short−circuits. http://onsemi.com 6 AMIS−42671 High Communication Speed Range 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). Pin TxD is pulled high internally should the input become disconnected. 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 1 Mbit/s. Fail−safe Features A current−limiting circuit protects the transmitter output stage from damage caused by an accidental short−circuit to http://onsemi.com 7 AMIS−42671 ELECTRICAL CHARACTERISTICS Definitions All voltages are referenced to GND (Pin 2). Positive currents flow into the IC. Sinking current means the current is flowing into the pin; sourcing current means the current is flowing out of the pin. Table 6. DC CHARACTERISTICS VCC = 4.75 V to 5.25 V, TA = −40°C to +150°C; RLT = 60 W unless specified otherwise. Symbol Parameter Conditions Min Typ Max Unit Dominant; VTXD = 0V Recessive; VTXD = VCC 25 2 45 4 65 8 mA SUPPLY (Pin VCC) ICC Supply current TRANSMITTER DATA INPUT (Pin TxD) VIH High−Level Input Voltage Output Recessive 2.0 − VCC+ 0.3 V VIL Low−Level Input Voltage Output Dominant −0.3 − +0.8 V IIH High−Level Input Current VTxD = VCC −1 0 +1 mA IIL Low−Level Input Current VTxD = 0V −75 −200 −350 mA Ci Input Capacitance Not Tested − 5 10 pF MODE SELECT (Pin AUTB) VIH High−Level Input Voltage Autobaud Mode 2.0 − VCC+ 0.3 V VIL Low−Level Input Voltage High−Speed Mode −0.3 − +0.8 V IIH High−Level Input Current VS = 2 V 20 30 50 mA IIL Low−Level Input Current VS = 0.8 V 15 30 45 mA 0.6 x VCC 0.75 x VCC Receiver Data Output (Pin RxD) VOH High−Level Output Voltage IRXD = −10 mA VOL Low−Level Output Voltage IRXD = 6 mA V 0.25 0.45 V REFERENCE VOLTAGE OUTPUT (Pin VREF) VREF Reference Output Voltage −50 mA < IVREF < +50 mA 0.45 x VCC 0.50 x VCC 0.55 x VCC V VREF_CM Reference Output Voltage for Full Common Mode Range −35 V