NCV7340 High Speed Low Power CAN Transceiver Description The NCV7340 CAN transceiver is the interface between a controller area network (CAN) protocol controller and the physical bus and 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. The NCV7340 is a new addition to the CAN high−speed transceiver family and is an improved drop−in replacement for the AMIS−42665. Due to the wide common−mode voltage range of the receiver inputs, the NCV7340 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. http://onsemi.com 8 1 SOIC−8 CASE 751AZ PIN ASSIGNMENT Features • Compatible with the ISO 11898 Standard (ISO 11898−2, ISO • • • • • • • • • • • Applications Extremely Low Current Standby Mode with Wakeup via the Bus Low EME Common−Mode Choke is No Longer Required Voltage Source via VSPLIT Pin for Stabilizing the Recessive Bus Level (Further EMC Improvement) No Disturbance of the Bus Lines with an Un−powered Node Transmit Data (TxD) Dominant Time−out Function Thermal Protection Bus Pins Protected Against Transients in an Automotive Environment Bus and VSPLIT Pins Short−Circuit Proof to Supply Voltage and Ground Logic Level Inputs Compatible with 3.3 V Devices Up to 110 Nodes can be Connected to the Same Bus in Function of Topology These are Pb−Free Devices 1 GND 2 VCC 3 RxD 4 NCV7340 11898−5 and SAE J2284) • Low Quiescent Current • High Speed (up to 1 Mbps) • Ideally Suited for 12 V and 24 V Industrial and Automotive TxD 8 STB 7 CANH 6 CANL 5 VSPLIT (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. Typical Applications • Automotive • Industrial Networks © Semiconductor Components Industries, LLC, 2010 May, 2010 − Rev. 1 1 Publication Order Number: NCV7340/D NCV7340 Table 1. KEY TECHNICAL CHARACTERISTICS AND OPERATING RANGES Min Max Unit VCC Symbol Power supply voltage Parameter Conditions 4.75 5.25 V VSTB DC voltage at pin STB 0 VCC V VTxD DC voltage at pin TxD 0 VCC V VRxD DC voltage at pin RxD 0 VCC V VCANH DC voltage at pin CANH 0 < VCC < 5.25 V; no time limit −50 +50 V VCANL DC voltage at pin CANL 0 < VCC < 5.25 V; no time limit −50 +50 V VSPLIT DC voltage at pin VSPLIT 0 < VCC < 5.25 V; no time limit −40 +40 V VO(dif)(bus_dom) Differential bus output voltage in dominant state 42.5 W < RLT < 60 W 1.5 3 V CM−range Input common−mode range for comparator Guaranteed differential receiver threshold and leakage current −35 +35 V Cload Load capacitance on IC outputs 15 pF tpd(rec−dom) Propagation delay TxD to RxD See Figure 7 75 230 ns tpd(dom−rec) Propagation delay TxD to RxD See Figure 7 75 245 ns TJ Junction temperature −40 150 °C BLOCK DIAGRAM VCC VCC TxD NCV7340 1 Timer VCC STB RxD GND 8 4 Mode & wakeup control 3 POR Thermal shutdown VSPLIT COMP COMP Figure 1. Block Diagram 2 5 VSPLIT 6 2 http://onsemi.com CANH VCC Driver control Wakeup Filter 7 CANL NCV7340 TYPICAL APPLICATION Application Schematics VBAT IN 5V−reg OUT VCC VCC STB RxD TxD 7 8 4 NCV7340 CAN controller 3 5 6 1 RLT = 60 W CANH VSPLIT CANL 2 GND CLT = 47 nF RLT = 60 W GND Figure 2. Application Diagram Pin Description 1 GND 2 VCC 3 RxD 4 NCV7340 TxD 8 STB 7 CANH 6 CANL 5 VSPLIT Figure 3. NCV7340 Pin Assignment Table 2. PIN FUNCTION DESCRIPTION Pin Name 1 TxD Transmit data input; low input → dominant driver; internal pullup current Description 2 GND Ground 3 VCC Supply voltage 4 RxD Receive data output; dominant transmitter → low output 5 VSPLIT Common−mode stabilization output 6 CANL Low−level CAN bus line (low in dominant mode) 7 CANH High−level CAN bus line (high in dominant mode) 8 STB Standby mode control input http://onsemi.com 3 CAN BUS NCV7340 FUNCTIONAL DESCRIPTION Split Circuit The VSPLIT pin is operational only in normal mode. In standby mode this pin is floating. The VSPLIT can be connected as shown in Figure 2 or, if it’s not used, can be left floating. Its purpose is to provide a stabilized DC voltage of 0.5 x VCC to the bus avoiding possible steps in the common−mode signal therefore reducing EME. These unwanted steps could be caused by an un−powered node on the network with excessive leakage current from the bus that shifts the recessive voltage from its nominal 0.5 x VCC voltage. Operating Modes NCV7340 provides two modes of operation as illustrated in Table 3. These modes are selectable through pin STB. Table 3. OPERATING MODES Pin RXD Pin STB Mode Low Normal Bus dominant Bus recessive High Standby Wakeup request detected No wakeup request detected Low High Wakeup When a valid wakeup (dominant state longer than tdbus) is received during the standby mode the RxD pin is driven low. The wakeup detection is not latched: RxD returns to High state after tdbus when the bus signal is released back to recessive – see Figure 4. Wake−up behavior in case of a permanent dominant − due to, for example, a bus short − represents the only difference between the circuit functional sub−versions listed in the Ordering Information table. When the standby mode is entered while a dominant is present on the bus, the “unconditioned bus wake−up” versions will signal a bus−wakeup immediately after the state transition (signal RxD1 in Figure 4). The other version will signal bus−wakeup only after the initial dominant is released (signal RxD2 in Figure 4). In this way it’s ensured, that a CAN bus can be put to a low−power mode even if the nodes have a level sensitivity to RxD pin and a permanent dominant is present on the bus. Normal Mode In the normal mode, 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 optimized to give extremely low EME. Standby Mode In standby mode both the transmitter and receiver are disabled and a very low−power differential receiver monitors the bus lines for CAN bus activity. The bus lines are terminated to ground and supply current is reduced to a minimum, typically 10 mA. When a wake−up request is detected by the low−power differential receiver, the signal is first filtered and then verified as a valid wake signal after a time period of tdbus, the RxD pin is driven low by the transceiver to inform the controller of the wake−up request. CANH CANL STB RxD 1 RxD 2 tdbus PD20100520.01 normal tdbus time standby Figure 4. NCV7340 Wakeup Behavior threshold and pin TxD goes high. The thermal protection circuit is particularly needed when a bus line short circuits. Overtemperature 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 the temperature decreases below the shutdown TxD Dominant Time−out Function A TxD dominant time−out timer circuit prevents the bus lines being driven to a permanent dominant state (blocking all network communication) if pin TxD is forced permanently low by a hardware and/or software application failure. The timer is triggered by a negative edge on pin TxD. If the duration of the low−level on pin TxD exceeds the http://onsemi.com 4 NCV7340 internal timer value tdom(TxD), the transmitter is disabled, driving the bus into a recessive state. The timer is reset by a positive edge on pin TxD. This TxD dominant time−out time (tdom(TxD)) defines the minimum possible bit rate to 40 kbps. 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 5). Pins TxD and STB are pulled high internally should the input become disconnected. Pins TxD, STB and RxD will be floating, preventing reverse supply should the VCC supply be removed. Fail Safe Features A current−limiting circuit protects the transmitter output stage from damage caused by accidental short circuit to 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. Absolute Maximum Ratings Table 4. ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Conditions Supply voltage Min Max Unit −0.3 +6 V VCANH DC voltage at pin CANH 0 < VCC < 5.25 V; no time limit −50 +50 V VCANL DC voltage at pin CANL 0 < VCC < 5.25 V; no time limit −50 +50 V VSPLIT DC voltage at pin VSPLIT 0 < VCC < 5.25 V; no time limit −40 +40 V VTxD DC voltage at pin TxD −0.3 6 V VRxD DC voltage at pin RxD −0.3 6 V VSTB DC voltage at pin STB −0.3 6 V Vesd Electrostatic discharge voltage at all pins Note 1 Note 2 −6 −500 6 500 kV V Electrostatic discharge voltage at CANH and CANL pins Note 3 −12 12 kV Static latchup at all pins Note 4 120 mA Latchup Tstg Storage temperature −55 +150 °C TA Ambient temperature −40 +125 °C TJ Maximum junction temperature −40 +170 °C 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. 1. Standardized human body model electrostatic discharge (ESD) pulses in accordance to EIA−JESD22. Equivalent to discharging a 100 pF capacitor through a 1.5 kW resistor. 2. Standardized charged device model ESD pulses when tested according to ESD−STM5.3.1−1999. 3. System human body model electrostatic discharge (ESD) pulses. Equivalent to discharging a 150 pF capacitor through a 330 W resistor. 4. Static latchup immunity: Static latchup protection level when tested according to EIA/JESD78. http://onsemi.com 5 NCV7340 Table 5. CHARACTERISTICS VCC = 4.75 V to 5.25 V; TJ = −40 to +150°C; RLT = 60 W unless specified otherwise. Symbol Parameter Conditions Min Typ Max Unit SUPPLY (Pin VCC) ICC Supply current Dominant; VTxD = 0 V Recessive; VTxD = VCC 35 5 75 10 mA ICCS Supply current in standby mode TJ,max = 100°C 10 15 mA TRANSMITTER DATA INPUT (Pin TxD) VIH High−level input voltage Output recessive 2.0 − VCC V VIL Low−level input voltage Output dominant −0.3 − +0.8 V IIH High−level input current VTxD = VCC −5 0 +5 mA IIL Low−level input current VTxD = 0 V −350 −200 −75 mA Ci Input capacitance Not tested − 5 10 pF TRANSMITTER MODE SELECT (Pin STB) VIH High−level input voltage Standby mode 2.0 − VCC V VIL Low−level input voltage Normal mode −0.3 − +0.8 V IIH High−level input current VSTB = VCC −5 0 +5 mA IIL Low−level input current VSTB = 0 V −10 −4 −1 mA Ci Input capacitance Not tested − 5 10 pF RECEIVER DATA OUTPUT (Pin RxD) Ioh High−level output current normal mode VRxD = VCC – 0.4 V −1 −0.4 −0.1 mA Iol Low−level output current VRxD = 0.4 V 2 6 12 mA Voh High−level output voltage standby mode IRxD = −100 mA VCC – 1.1 VCC – 0.7 VCC – 0.4 V BUS LINES (Pins CANH and CANL) Vo(reces) (norm) Recessive bus voltage on pins CANH and CANL VTxD = VCC; no load normal mode 2.0 2.5 3.0 V Vo(reces) (stby) Recessive bus voltage on pins CANH and CANL VTxD = VCC; no load standby mode −100 0 100 mV Io(reces) (CANH) Recessive output current at pin CANH −35 V < VCANH < +35 V; 0 V < VCC < 5.25 V −2.5 − +2.5 mA Io(reces) (CANL) Recessive output current at pin CANL −35 V < VCANL < +35 V; 0 V < VCC < 5.25 V −2.5 − +2.5 mA ILI(CANH) Input leakage current to pin CANH VCC = 0 V VCANL = VCANH = 5 V −10 0 10 mA ILI(CANL_ Input leakage current to pin CANL VCC = 0 V VCANL = VCANH = 5 V −10 0 10 mA Vo(dom) (CANH) Dominant output voltage at pin CANH VTxD = 0 V 3.0 3.6 4.25 V Vo(dom) (CANL) Dominant output voltage at pin CANL VTxD = 0 V 0. 5 1.4 1.75 V Vo(dif) (bus_dom) Differential bus output voltage (VCANH − VCANL) VTxD = 0 V; dominant; 42.5 W < RLT < 60 W 1.5 2.25 3.0 V Vo(dif) (bus_rec) Differential bus output voltage (VCANH − VCANL) VTxD = VCC; recessive; no load −120 0 +50 mV Io(sc) (CANH) Short circuit output current at pin CANH VCANH = 0 V; VTxD = 0 V −120 −70 −45 mA Io(sc) (CANL) Short circuit output current at pin CANL VCANL = 36 V; VTxD = 0 V 45 70 120 mA Vi(dif) (th) Differential receiver threshold voltage (see Figure 6) −5 V < VCANL < +12 V; −5 V < VCANH < +12 V; 0.5 0.7 0.9 V Vihcm(dif) (th) Differential receiver threshold voltage for high common−mode (see Figure 6) −35 V < VCANL < +35 V; −35 V < VCANH < +35 V; 0.40 0.7 1.0 V http://onsemi.com 6 NCV7340 Table 5. CHARACTERISTICS VCC = 4.75 V to 5.25 V; TJ = −40 to +150°C; RLT = 60 W unless specified otherwise. Symbol Parameter Conditions Min Typ Max Unit 0.4 0.8 1.15 V BUS LINES (Pins CANH and CANL) Vi(dif) (th)_STDBY Differential receiver threshold voltage in standby mode (see Figure 6) Ri(cm) (CANH) Common−mode input resistance at pin CANH 15 26 37 kW Ri(cm) (CANL) Common−mode input resistance at pin CANL 15 26 37 kW Ri(cm) (m) Matching between pin CANH and pin CANL common mode input resistance −3 0 +3 % Ri(dif) Differential input resistance 25 50 75 kW Ci(CANH) Input capacitance at pin CANH VTxD = VCC; not tested 7.5 20 pF Ci(CANL) Input capacitance at pin CANL VTxD = VCC; not tested 7.5 20 pF Ci(dif) Differential input capacitance VTxD = VCC; not tested 3.75 10 pF − 0.7 x VCC −12 V < VCANL < +12 V; −12 V < VCANH < +12 V; VCANH = VCANL COMMON−MODE STABILIZATION (Pin VSPLIT) VSPLIT Reference output voltage at pin VSPLIT Normal mode; −500 mA < ISPLIT < 500 mA 0.3 x VCC ISPLIT(i) VSPLIT leakage current Standby mode −5 +5 mA ISPLIT(lim) VSPLIT limitation current Normal mode 1.3 5 mA junction temperature rising 150 160 185 °C THERMAL SHUTDOWN TJ(sd) Shutdown junction temperature TIMING CHARACTERISTICS (see Figures 7 and 8) td(TxD−BUSon) Delay TxD to bus active Cl = 100 pF between CANH to CANL 20 85 105 ns td(TxD−BUSoff) Delay TxD to bus inactive Cl = 100 pF between CANH to CANL 30 60 105 ns td(BUSon−RXD) Delay bus active to RxD Crxd = 15 pF 25 55 105 ns td(BUSoff−RXD) Delay bus inactive to RxD Crxd = 15 pF 30 100 105 ns tpd(rec−dom) Propagation delay TxD to RxD from recessive to dominant Cl = 100 pF between CANH to CANL 75 230 ns td(dom−rec) Propagation delay TxD to RxD from dominant to recessive Cl = 100 pF between CANH to CANL 75 245 ns td(stb−nm) Delay standby mode to normal mode tdbus Dominant time for wakeup via bus tdom(TxD) TxD dominant time for time out 5 7.5 10 ms Vdif(dom) > 1.4 V 0.75 2.5 5 ms Vdif(dom) > 1.2 V 0.75 3 5.8 ms VTxD = 0 V 300 650 1000 ms http://onsemi.com 7 NCV7340 MEASUREMENT SETUPS AND DEFINITIONS +5 V 100 nF VCC 3 TxD 1 4 5 V SPLIT Transient Generator 1 nF 6 CANL 2 8 15 pF 1 nF NCV7340 RxD CANH 7 GND STB Figure 5. Test Circuit for Automotive Transients VRxD High Low Hysteresis 0.9 0.5 Vi(dif)(hys) Figure 6. Hysteresis of the Receiver +5 V 100 nF VCC 3 TxD 1 NCV7340 RxD 7 4 2 STB RLT VSPLIT 60 W 6 8 15 pF 5 CANH CLT 100 pF CANL GND Figure 7. Test Circuit for Timing Characteristics http://onsemi.com 8 NCV7340 HIGH LOW TxD CANH CANL dominant Vi(dif) = VCANH − VCANL 0.9V 0.5V recessive RxD 0.7 x VCC 0.3 x VCC td(TxD−BUSon) td(TxD−BUSoff) td(BUSon−RxD) tpd(rec−dom) tpd(dom−rec) td(BUSoff−RxD) Figure 8. Timing Diagram for AC Characteristics DEVICE ORDERING INFORMATION Part Number NCV7340D12G NCV7340D12R2G NCV7340D14G NCV7340D14R2G Description Temperature Range Shipping† 96 Tube / Tray HS LP CAN Transceiver (Unconditioned Bus Wakeup) HS LP CAN Transceiver (Bus Wakeup Inactive in Case of Bus Fault) Package Type −40°C to +125°C SOIC 150 8 (Mate Sn, JEDEC MS−012) (Pb−Free) 3000 / Tape & Reel 96 Tube / Tray 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 9 NCV7340 PACKAGE DIMENSIONS SOIC 8 CASE 751AZ−01 ISSUE O http://onsemi.com 10 NCV7340 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. 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