MAX33012EASA+

EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection General Description Benefits and Features The MAX33011E/MAX33012E, and MAX33014E/ MAX33015E are a family of +5V control area network (CAN) transceivers with integrated protection for industrial applications. These devices have extended ±65V fault protection on the CAN bus for equipment where overvoltage protection is required. The CAN family also incorporates high ±45kV ESD HBM protection and an input common-mode range (CMR) of ±25V, exceeding the ISO 11898 specification of -2V to +7V, and well suited for applications where ground planes from different systems are shifting relative to each other. ● Integrated Protection Increases Robustness • ±65V Fault-Tolerant CANH and CANL • ±45kV ESD HBM (Human Body Model) • ±30kV IEC Air-Gap and ±12kV IEC Contact • ±25V Extended Common-Mode Input Range (CMR) • Transmitter Dominant Timeout Prevents Lockup • Short-Circuit Protection Limits Driver Current • Thermal Shutdown This CAN family incorporates a fault-detection feature where it monitors the CANH and CANL line for faults like overcurrent, overvoltage, and transmission failure. When a fault is detected, the FAULT pin goes high, which triggers an external interrupt with the local CAN controller, and the driver and receiver lines are placed in recessive mode. The system clock then drives the TXD pin and a fault code is transmitted through the RXD line back to the controller. When the specific fault code is transmitted and the system is programmed to alert local service personnel, they are able to troubleshoot and debug the problem quicker, providing valuable diagnostics and decreased equipment downtime. In addition, the family features a variety of options to address common CAN application requirements: low-current standby mode, slow slew rate for improved EMI performance, silent-mode to disable the transmitter, low level translation to interface with lowvoltage controllers, and loopback mode for remote self diagnostics. These devices are specified for data rates up to 5Mbps. The transceivers include a dominant timeout to prevent bus lockup caused by controller error or by a fault on the TXD input. When TXD remains in the dominant state (low) for longer than tDOM, the driver is switched to the recessive state, releasing the bus. The MAX33011E/MAX33012E are in a standard 8-pin SOIC package and the MAX33014E/MAX33015E are in a 10-pin TDFN-EP package. This family of devices operates over the -40°C to +125°C temperature range. Applications ● ● ● ● ● Industrial Automation Building Automation Vending Machines Security Systems Heavy Equipment/Machinery 19-100701; Rev 2; 2/21 ● Family Provides Flexible Design Options • 1.62V to 5.5V Logic-Supply (VL) Range (MAX33014E and MAX33015E) • Silent Mode S Disables Transmitter (MAX33011E and MAX33015E) • STBY Input for Low-Current, Slow Slew Rate, and Normal Mode (MAX33012E and MAX33014E) • LPBK Enables Remote Diagnostics (MAX33014E and MAX33015E) ● Fault Detection and Reporting • Detects Overcurrent, Overvoltage, and Transmission Failure • Error Code Reporting Through RXD ● Operating Temperature Range of -40°C to +125°C Ordering Information appears at end of data sheet. MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Simplified Block Diagram VDD VL THERMAL SHUTDOWN PROTECTION TXD LPBK LEVEL SHIFTER STBY/S DOMINANT TIMEOUT RXD www.maximintegrated.com FAULT REPORT PROTECTION DRIVER WAKE-UP MODE CONTROL CANH CANL FAULT FAULT DETECTION DRIVER MUX WAKE-UP FILTER GND Maxim Integrated | 2 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Absolute Maximum Ratings VDD........................................................................... -0.3V to +6V CANH or CANL (Continuous) .................................. -65V to +65V TXD, RXD, STBY, S, LPBK, FAULT ........................ -0.3V to +6V VL MAX33014E/15E................................... -0.3V to (VDD + 0.5V) Short-Circuit Duration ................................................. Continuous Continuous Power Dissipation 8 SO Single-Layer Board (TA = +70°C, derate 5.9mW/°C above +70°C.)............................................................ 470.6mW 8 SO Multilayer Board (TA = +70°C, derate 7.6mW/°C above +70°C.)....................................................................... 606.1mW 10 TDFN Single-Layer Board (TA = +70°C, derate 18.5mW/°C above +70°C.) ..........................................................1481.5mW 10 TDFN Multilayer Board (TA = +70°C, derate 24.4mW/°C above +70°C.) ..........................................................1951.2mW Operating Temperature Range ...........................-40°C to +125°C Junction Temperature ....................................................... +150°C Storage Temperature Range ..............................-60°C to +150°C Soldering Temperature (reflow) ........................................ +260°C Lead Temperature (soldering, 10sec)............................... +300°C Note 1: All voltages are referenced to GND, unless otherwise noted. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JEDSD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 8 SOIC Package Code S8+4 Outline Number 21-0041 Land Pattern Number 90-0096 Thermal Resistance, Single-Layer Board: Junction to Ambient (θJA) 170°C/W Junction to Case (θJC) 40°C/W Thermal Resistance, Four-Layer Board: Junction to Ambient (θJA) 132°C/W Junction to Case (θJC) 38°C/W 10 TDFN Package Code T1034N+1 Outline Number 21-0268 Land Pattern Number 90-0247 Thermal Resistance, Single-Layer Board: Junction to Ambient (θJA) 54°C/W Junction to Case (θJC) 9°C/W Thermal Resistance, Four-Layer Board: Junction to Ambient (θJA) 41°C/W Junction to Case (θJC) 9°C/W For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. www.maximintegrated.com Maxim Integrated | 3 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Electrical Characteristics (VDD = 4.5V to 5.5V, VL = 1.62V to VDD, RL = 60Ω, CL = 15pF, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VDD = 5V, VL = 3.3V (MAX33014E/MAX33015E), and TA = +25°C, unless otherwise specified. (Note 1), Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Specifications marked "GBD" are guaranteed by design and not production tested.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 4.5 5.5 V 1.62 VDD V POWER Supply Voltage Logic Supply Voltage VDD VL MAX33014E/MAX33015E Dominant Supply Current IDD_DOM TXD = 0V Recessive Supply Current IDD_REC VDD = 5V, TXD = VL Standby Supply Current ISTBY No load 5 8 RL = 60Ω 50 70 No load 4 CANH shorted to CANL 4 mA mA STBY = VL, no external pullup resistor on FAULT pin 60 μA 3 mA Silent Mode Supply Current IS S = VL Logic Supply Current IL RXD = open UVLO Threshold Rising VUVLO_R VDD rising UVLO Threshold Falling VUVLO_F VDD falling VL = 5V 60 VL = 3.3V 40 VL = 1.8V 22 μA 4.25 3.45 V V PROTECTION ESD CANH and CANL ESD Other Pins Fault Protection Range ESDALL VFP HBM JEDEC JS-001, Note 3 ±45 Air Gap IEC 61000-4-2 ±30 Contact IEC 61000-4-2 ±12 HBM JEDEC JS-001, Note 3 ±4 CANH or CANL to GND -65 kV kV +65 V Thermal Shutdown TSHDN +160 °C Thermal Shutdown Hysteresis THYST +20 °C LOGIC INTERFACE (RXD, TXD, LPBK) Input High Voltage VIH 0.7 x VL V 2.25V ≤ VL ≤ 5.5V 0.8 1.62V ≤ VL ≤ 2.25V 0.6 Input Low Voltage VIL TXD Input Pullup Resistance RPU_TXD 100 250 kΩ STBY, S Input Pullup Resistance/LPBK Pulldown Resistance RPU_S 100 250 kΩ Output High Voltage (RXD) VOH www.maximintegrated.com Sourcing 4mA VL - 0.4 V V Maxim Integrated | 4 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Electrical Characteristics (continued) (VDD = 4.5V to 5.5V, VL = 1.62V to VDD, RL = 60Ω, CL = 15pF, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VDD = 5V, VL = 3.3V (MAX33014E/MAX33015E), and TA = +25°C, unless otherwise specified. (Note 1), Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Specifications marked "GBD" are guaranteed by design and not production tested.) PARAMETER Output Low Voltage (RXD) SYMBOL VOL CONDITIONS MIN TYP Sinking 4mA MAX UNITS 0.4 V CAN BUS DRIVER Bus Output Voltage (Dominant) VO_DOM t < tDOM, TXD = 0V, RL = 60Ω Bus Output Voltage (Recessive) VO_REC TXD = VL, no load Bus Output Differential Voltage (Dominant) VOD_DOM TXD = 0V, RL = 60Ω CANH 2.75 4.5 CANL 0.5 2.25 2 3 1.5 3 -5V ≤ VCM ≤ 10V, RCM = 156Ω, Figure 1 RCM = open V V V 1.5 3 RL = 60Ω -120 +12 No load -500 +50 No load 70 160 mV Bus Output Differential Voltage (Recessive) VOD_REC TXD = VL Bus Output Voltage Standby VO_STBY TXD = STBY = VL High-Side Short-Circuit Current ISC_CANH TXD = CANH = 0V 175 250 mA Low-Side Short-Circuit Current ISC_CANL TXD = 0V, CANL = VDD 175 250 mA mV RECEIVER Common-Mode Input Range VCM CANH or CANL to GND, RXD output valid -25 +25 V Common-Mode Input Range Standby Mode VCM_STBY CANH or CANL to GND, RXD output valid -12 +12 V 0.9 V Input Differential Threshold Voltage (Dominant) VID_DOM -25V ≤ VCM ≤ +25V, TXD = VL Input Differential Threshold Voltage (Recessive) VID_REC -25V ≤ VCM ≤ +25V, TXD = VL Standby Input Differential Threshold Voltage (Dominant) VID_SDOM -12V ≤ VCM ≤ +12V, TXD = VL Standby Input Differential Threshold Voltage (Recessive) VID_SREC -12V ≤ VCM ≤ +12V, TXD = VL 0.5 V 1.15 0.45 V V Input Differential Hysteresis VID_HYS Input Resistance RIN TXD = VL 10 50 kΩ Differential Input Resistance RIN_DIFF TXD = VL 20 100 kΩ www.maximintegrated.com -25V ≤ VCM ≤ +25V 100 mV Maxim Integrated | 5 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Electrical Characteristics (continued) (VDD = 4.5V to 5.5V, VL = 1.62V to VDD, RL = 60Ω, CL = 15pF, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VDD = 5V, VL = 3.3V (MAX33014E/MAX33015E), and TA = +25°C, unless otherwise specified. (Note 1), Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Specifications marked "GBD" are guaranteed by design and not production tested.) PARAMETER Input Capacitance Differential Input Capacitance Input Leakage Current SYMBOL TYP MAX UNITS CIN TXD = VL (Note 2) 22 39 pF CIN_DIFF TXD = VL (Note 2) 12 22 pF 150 280 μA ILKG CONDITIONS VDD = VL = 0V MIN CANH = CANL = VDD SWITCHING Data Rate RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 5 Mbps Driver Rise Time tR RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 10 ns Driver Fall Time tF RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 14 ns Slow Slew Driver Rise Time tSSR RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 160 ns Slow Slew Driver Fall Time tSSF RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 130 ns TXD to RXD Loop Delay tLOOP RL = 60Ω, Dominant to Recessive and Recessive to Dominant, Figure 2 60 100 ns TXD Propagation Delay (Recessive to Dominant) tONTXD RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 30 50 ns TXD Propagation Delay (Dominant to Recessive) tOFFTXD RL = 60Ω, CLD = 100pF, RCM is open, Figure 1 25 50 ns RXD Propagation Delay (Recessive to Dominant) tONRXD CL = 15pF, Figure 3 25 70 ns RXD Propagation Delay (Dominant to Recessive) tOFFRXD CL = 15pF, Figure 3 30 70 ns TXD-Dominant TimeOut tDOM Figure 4 4.3 ms Wake-Up Time tWAKE Figure 5 Fault Interrupt on Delay (Overcurrent, Overvoltage, Transmission Failure) Loopback Delay from Transmitter Input to Receiver Output tFAULT_LH tLPBK 100kΩ pullup resistor to VDD, 2.5MHz signal on TXD, Figure 6 1.3 2.2 Overcurrent and overvoltage 4 Transmission failure 8 MAX33014E/MAX33015E μs μs 15 ns Standby to Normal Mode Delay tSTBY_NORM 20 µs Normal to Standby Mode Delay tNORM_STBY 40 μs 300 ns Standby Propagation Delay www.maximintegrated.com tPLH_STBY CL = 15pF, Figure 5 Maxim Integrated | 6 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Note 1: All units are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 2: Not production tested. Guaranteed at TA = +25°C. Note 3: Tested at the limits of test equipment. RCM RL CLD VDIFF RCM VCM VL TXD 50% 50% 0V tONTXD tOFFTXD VDIFF 0.9V 90% 10% tR 0.5V tF Figure 1. Transmitter Test Circuit and Timing Diagram www.maximintegrated.com Maxim Integrated | 7 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection CANH TXD RL CLD CANL RXD CL VL 50% TXD 0V tLOOP2 VL 50% RXD 0V tLOOP1 Figure 2. TXD to RXD Loop Delay CANH RXD + VID - CL CANL VL 0.9V VID 0.5V 0V tONRXD RXD tOFFRXD 50% 50% VOH VOL Figure 3. RXD Timing Diagram www.maximintegrated.com Maxim Integrated | 8 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection tDOM TRANSMITTER ENABLED VL TXD 0V TRANSMITTER DISABLED VCANH - VCANL Figure 4. Transmitting Dominant Timeout Timing Diagram VL STBY CANH RXD RL CL CLD CANL tWAKE tPLH_STBY VL RXD 0V VCANH - VCANL Figure 5. Standby Receiver Propagation Delay www.maximintegrated.com Maxim Integrated | 9 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection tFAULT_LH 5V/div 5V/div FAULT 90% OF VDD 2V/div 2µs/div Figure 6. FAULT Propagation Delay from Low to High www.maximintegrated.com Maxim Integrated | 10 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Typical Operating Characteristics (VDD = 5V, VL = 3.3V, RL = 60Ω, CL = 15pF, TA = +25°C, unless otherwise noted.) www.maximintegrated.com Maxim Integrated | 11 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Typical Operating Characteristics (continued) (VDD = 5V, VL = 3.3V, RL = 60Ω, CL = 15pF, TA = +25°C, unless otherwise noted.) NORMAL MODE WITH STBY GROUNDED www.maximintegrated.com SLEW RATE WITH 26.1k 26.1kΩ Ω RESISTOR TO GND ON STBY Maxim Integrated | 12 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Pin Configurations MAX33011E TOP VIEW TXD 1 GND + 8 S 2 7 CANH VDD 3 6 CANL RXD 4 5 FAULT 8 STBY SOIC MAX33012E TOP VIEW + TXD 1 GND 2 7 CANH VDD 3 6 CANL RXD 4 5 FAULT SOIC www.maximintegrated.com Maxim Integrated | 13 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection MAX33014E TOP VIEW 1 10 STBY LPBK 2 9 CANH GND 3 8 CANL VDD 4 7 VL RXD 5 6 FAULT + TXD TDFN-EP 3mm x 4mm MAX33015E TOP VIEW 1 10 S LPBK 2 9 CANH GND 3 8 CANL VDD 4 7 VL RXD 5 6 FAULT + TXD TDFN-EP 3mm x 4mm Pin Description PIN MAX33011E MAX33012E MAX33014E MAX33015E 1 1 1 1 NAME FUNCTION TXD Transmit Data Input. TXD is a CMOS/TTL compatible input from a CAN controller with an internal pullup to VDD. — — 2 2 LPBK Loopback Mode. When connected to logic-high, the transmitter and receiver are placed in a highimpedance state. Internally, the TXD line drives directly to the RXD line for loopback that can be used for self-diagnostic of the transceiver without disturbing the bus. When loopback mode is not used, connect to GND or leave floating. 2 2 3 3 GND Ground 3 3 4 4 VDD Supply Voltage. Bypass VDD to GND with a 0.1µF capacitor. www.maximintegrated.com Maxim Integrated | 14 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Pin Description (continued) PIN NAME FUNCTION MAX33011E MAX33012E MAX33014E MAX33015E 4 4 5 5 RXD 5 5 6 6 FAULT Fault Detected Indication. Stays low when fault is not detected. Release to high if an overcurrent, overvoltage, or transmission failure is detected. VL Logic Supply Input. VL is the logic supply voltage for the input/output between the CAN transceiver and controller. VL allows full compatibility from +1.62V to +5.5V logic on all digital lines. Bypass to GND with a 0.1µF capacitor. Connect VL to VDD for 5V logic compatibility. Receive Data Output. RXD is a CMOS/TTL compatible output from the physical bus lines CANH and CANL. — — 7 7 6 6 8 8 CANL CAN Bus Line Low 7 7 9 9 CANH CAN Bus Line High 8 — — 8 www.maximintegrated.com — 10 10 — S Silent Mode Input. Drive S low to enable TXD and to operate in normal mode. Drive S high to disable the transmitter. A 26.1kΩ external resistor can be used to connect the S pin to ground for slow slew mode. STBY Standby Mode Input. A logic-high on STBY pin selects the standby mode. In standby mode, the transmitter is disabled, and the receiver is in lowpower mode. A logic-low on STBY pin puts the transceiver in normal operating mode. A 26.1kΩ external resistor can be used to connect the STBY pin to ground for slow slew mode. Maxim Integrated | 15 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Detailed Description The MAX33011E/MAX33012E and MAX33014E/MAX33015E are a family of fault-protected CAN transceivers with fault detection and fault reporting. They are designed for applications where expeditious troubleshooting is important to increase the up time of important control systems, addressing common faults like overcurrent, overvoltage, and transmission failure. These devices are ideal for harsh industrial applications with a number of integrated robust protection feature set that improve the reliability of end equipment. These devices provide a link between the CAN protocol controller and the physical wires of the bus lines in a CAN. They can be used for DeviceNet™, CAN Kingdom, and CANOpen™ applications as well. All CAN transceivers in the family are fault protected up to ±65V, making them suitable for applications where overvoltage protection is required. These devices are rated up to a high ±45kV ESD of human body model (HBM), suitable for protection during the manufacturing process, and even in the field where there is a human interface for installation and maintenance. In addition, a common-mode voltage range of ±25V enables communication in noisy environments where there are ground plane differences between different systems due to the close proximity of heavy equipment machinery or operation from different transformers. Dominant timeout prevents the bus from being blocked by a hung-up microcontroller, and the outputs CANH and CANL are short-circuit current-limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs in a high-impedance state. The MAX33011E/MAX33012E and MAX33014E/MAX33015E can operate up to 5Mbps. This family has the option to slow the slew rate to 8V/μs to minimize EMI, enabling the use of unshielded-twisted or parallel cable. The MAX33011E/ MAX33012E are packaged in an industry-standard 8-pin SO, while the MAX33014E/MAX33015E are packaged in a 10-pin TDFN. This family of robust CAN transceivers has an operating temperature from -40°C to +125°C. ±65V Fault Protection These devices feature ±65V of fault protection. The CANH and CANL data lines are capable of withstanding a short from -65V to +65V. This extended overvoltage range makes it suitable for applications where accidental shorts to power supply lines are possible due to human intervention. Transmitter The transmitter converts a single-ended input signal (TXD) from the local CAN controller to differential outputs for the bus lines CANH and CANL. The truth table for the transmitter and receiver is provided in Table 1. Table 1. Transmitter and Receiver Truth Table (When Not Connected to the Bus) STBY TXD TXD LOW TIME CANH CANL BUS STATE RXD LOW LOW < tDOM HIGH LOW DOMINANT LOW LOW LOW > tDOM VDD/2 VDD/2 RECESSIVE HIGH LOW HIGH X VDD/2 VDD/2 RECESSIVE HIGH X = Don't care www.maximintegrated.com Maxim Integrated | 16 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Transmitter Output Protection This family of CAN transceivers protects the transmitter output stage against a short-circuit to a positive or negative voltage by limiting the driver current. See the CANH and CANL short-circuit current TOC graphs. Thermal shutdown further protects the devices from excessive temperatures that may result from a short. The transmitter returns to normal operation once the short is removed. Transmitter-Dominant Timeout These devices feature a transmitter-dominant timeout (tDOM) that prevents erroneous CAN controllers from clamping the bus to a dominant level by maintaining a continuous low TXD signal. When TXD remains in the dominant state (low) for greater than tDOM, the transmitter is disabled, releasing the bus to a recessive state (Figure 4). After a dominant timeout fault, the transmitter is re-enabled when receiving a rising edge at TXD. The transmitter-dominant timeout limits the minimum possible data rate to 9kbps for standard CAN protocol. Receiver The receiver reads the differential input from the bus line CANH and CANL and transfers this data as a single-ended output RXD to the CAN controller. It consists of a comparator that senses the difference VDIFF = (CANH-CANL), with respect to an internal threshold of 0.7V. If VDIFF > 0.9V, a logic-low is present on RXD. If VDIFF < 0.5V, a logic-high is present. The CANH and CANL common-mode range is ±25V in normal mode and ±12V in standby mode. RXD is a logic-high when CANH and CANL are shorted or terminated and undriven. Fault Detection and Reporting This family of devices has fault detection for overcurrent, overvoltage, and transmission failure in normal mode operation. The detection of faults and reporting them out to the local CAN controller provide additional information that benefits the troubleshooting of a given problem in a CAN bus system, reducing down time, improving equipment efficiencies, and keeping service costs down. To enable fault detection upon power-up, 100 low-to-high transitions need to pass through TXD, which is typically 1 or 2 CAN frame messages depending on data payload size (classic or extended format) and which protocol is used. Fault detection is not enabled in standby and silent mode. After the 100 low-to-high transitions on TXD, if a fault is detected, then another 16 low-to-high transitions on TXD are required to shift out the fault code shown in Table 2. In addition, 10 more pulses are needed to clear the fault. Table 2. Fault Detection and Reporting CONDITION (FAULT DETECTION ENABLED) FAULT CODE Overcurrent >85mA 101010 ● CANH connected to GND and CANL connected to VDD Overvoltage CANH > +29V or CANL < -29V 101100 ● CMR fault 110010 ● Open load (both termination resistors missing) on CANH and CANL ● Exceeds driver's common-mode range FAULT POSSIBLE CAUSE ● CANH shorted to CANL Transmission Failure RXD unchanged for 10 consecutive pulses, recommended minimum frequency = 200kHz ● CANH and/or CANL connected to a fixed voltage source Overvoltage Detection Overvoltage detection is triggered when CANH is above approximately +29V or CANL is below approximately -29V. This indicates that the CAN bus has likely violated the CMR range or that a short fault on CANH and/or CANL has occurred and is beyond the ±29V threshold. Once overvoltage detection is triggered, the FAULT pin transitions from low to high and the fault code is clocked out of RXD through TXD. www.maximintegrated.com Maxim Integrated | 17 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Overcurrent Detection Overcurrent detection is triggered when there is a high current path from VDD to GND through a short from CANH to CANL. In addition, shorts far away from the CAN node may not be detected due to high cable impedance. See Figure 7 for overcurrent detection maximum operating frequency versus cable length as a reference. A Cat5e copper-clad aluminum cable is used. The maximum frequency will vary with the type of cable. CABLE LENGTH vs. MAXIMUM SHORT DETECTION FREQUENCY FREQUENCY [MHz] 3 2.5 2 1.5 1 0.5 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 CABLE LENGTH [m] Figure 7. Overcurrent Detection Operating Frequency vs. Cable Length Transmission Failure Detection Transmission failure detection is triggered when the signal on RXD does not match TXD for 10 consecutive cycles after fault detection is enabled. This can occur when both termination resistors are missing. Other scenarios include, but are not limited to, shorting CANH to GND or CANL to VDD resulting in the differential signal not meeting the receiver’s VIH and VIL specification. www.maximintegrated.com Maxim Integrated | 18 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Fault Reporting When a fault occurs and the FAULT pin goes high, the CANH and CANL lines are placed in high impedance, and a 6-bit fault code of the first detected fault condition is stored in an internal register. 16 low-to-high transitions need to go through TXD to shift the fault code out through RXD. An overcurrent fault timing diagram is shown in Figure 8. 10 PULSES 6 PULSES 10 PULSES RXD TXD FAULT Figure 8. Overcurrent Fault Reporting Timing Diagram Fault Clear The fault condition can be cleared only after the 6-bit fault code is reported through the RXD pin of the chip. Soon after the fault code is reported, send 10 clock pulses through the TXD pin, which deasserts the FAULT pin. The FAULT pin cannot be cleared in standby or silent mode. Fault detection is disabled after fault is cleared and another 100 low-to-high transitions are required on TXD to re-enable fault detection. Standby Mode (MAX33012E, MAX33014E) Drive the STBY pin high for standby mode, which switches the transmitter off and the receiver to a low current and lowspeed state. The supply current is reduced to 60μA during standby mode. The bus line is monitored by a low differential comparator to detect and recognize a wakeup event on the bus line. Once the comparator detects a dominant bus level longer than tWAKE, RXD is pulled low. Drive the STBY pin low for normal operation. Fault detection is disabled in standby mode. Slow Slew Rate Mode Connect a 26.1kΩ resistor between ground and the STBY/S pin. This will put the device in slow slew rate mode where the typical rising slew rate is 10V/s and the typical falling slew rate is 18V/s, enabling the use of unshielded-twisted or parallel cable, compared with normal mode at 140V/μs falling and 180V/μs rising slew rate. The STBY pin voltage should be between 0.2V to 0.6V to remain in slow slew rate mode. Slow slew rate mode is recommended for transmitter frequencies which have a data rate that is less than 1Mbps. Silent Mode (MAX33011E, MAX33015E) Drive S high to place the device in silent mode. This disables the transmitter regardless of the voltage level at TXD. However, RXD is still active and monitors activity on the bus line. Make sure that the FAULT pin is cleared before entering into silent mode. Fault detection is disabled in silent mode. www.maximintegrated.com Maxim Integrated | 19 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Loopback Mode (MAX33014E, MAX33015E) The LPBK pin enables the local CAN controller to perform self-diagnostics. A logic-high to LPBK places the transceiver in a high impedance state to the bus. This allows data to pass internally from the driver to receiver in a loopback test mode without disturbing the bus. When LPBK is connected to the ground, the transceiver operates in normal mode. Logic Compatibility (MAX33014E, MAX33015E) A separate input VL allows the devices to communicate with logic systems down to 1.62V while operating from a +5V supply. This provides a reduced input voltage threshold to the TXD, STBY, S, and LPBK inputs, and provides a logic-high output at RXD that is compatible with the microcontroller's supply rail. The logic compatibility eliminates an external logic level translator and longer propagation delay. Connect VL to VDD to operate with +5V logic systems. www.maximintegrated.com Maxim Integrated | 20 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Applications Information Reduced EMI and Reflections In multidrop CAN applications, it is important to maintain a single linear bus of uniform impedance that is properly terminated at each end. A star, ring, or tree configuration should never be used. Any deviation from the end-to-end wiring scheme creates a stub. High-speed data edges on a stub can create reflections back down to the bus. These reflections can cause data errors by eroding the noise margin of the system. Although stubs are unavoidable in a multidrop system, care should be taken to keep these stubs as short as possible, especially when operating with high data rates. Typical Application Circuit Multidrop CAN Bus 1.8V 5V 60Ω 60Ω 60Ω 60Ω 0.1µF 47nF 0.1µF MICROCONTROLLER VL RX GPIO GPIO TXD GPIO 47nF VDD RXD TRANSCEIVER 4 FAULT LPBK TXD S/STBY MAX33011E/12E/14E/15E TRANSCEIVER 2 TRANSCEIVER 3 Ordering Information PART NUMBER TEMP RANGE PIN-PACKAGE FEATURE SET MAX33011EASA+ -40°C to +125°C 8 SO S MAX33012EASA+ -40°C to +125°C 8 SO STBY MAX33014EATB+ -40°C to +125°C 10 TDFN STBY, LPBK, VL MAX33015EATB+ -40°C to +125°C 10 TDFN S, LPBK, VL + Denotes a lead(Pb)-free/RoHS-compliant package. www.maximintegrated.com Maxim Integrated | 21 MAX33011E/12E/14E/15E +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±45kV ESD Protection Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 12/19 Initial release 1 6/20 Updated to include MAX33011EASA+ information in the Electrical Characteristics table, Pin Description, Detailed Description, and Ordering Information table 4, 15, 16, 19, 21 2 2/21 Updated Electrical Characteristics table, Detailed Description, and Ordering Information table 4, 20, 21 — For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2021 Maxim Integrated Products, Inc.