MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers General Description Features o MAX13020 is a Pin-to-Pin Upgrade for TJA1020 o ESD Protection ±12kV Human Body Model (LIN) ±4kV Contact Discharge (LIN, NWAKE, BAT) o LIN 2.0/SAE J2602 Compatible o Slew-Rate Limited Transmitter for Low Electromagnetic Emissions (EME) o Robust Electromagnetic Immunity (EMI) o Passive Behavior in Unpowered State o TXD Dominant Timeout Function o LIN Bus Dominant Management (MAX13021 Only) o Input Levels Compatible with +3.3V and +5V Controllers o Integrated 30kΩ Termination Resistor for Slave Applications o Low 4µA Sleep Mode with Local and Remote Wake-Up Detection o Wake-Up Source Recognition o Thermal Shutdown The MAX13020/MAX13021 ±60V fault-protected lowpower local interconnect network (LIN) transceivers are ideal for use in automotive network applications where high reliability is required. The devices provide the interface between the LIN master/slave protocol controller, and the physical bus described in the LIN 2.0 specification package and SAE J2602 specification. The devices are intended for in-vehicle subnetworks with a single master and multiple slaves. The extended fault-protected voltage range of ±60V on the LIN bus line allows for use in +12V, +24V, and +42V automotive applications. The devices allow communication up to 20kbaud, and include slew-rate limited transmitters for enhanced electromagnetic emissions (EME) performance. The devices feature a low-power 4µA sleep mode and provide wake-up source detection. The MAX13020 is a pin-to-pin replacement and is functionally compatible with the Philips TJA1020. The MAX13021 includes enhanced bus dominant clamping fault management for reduced quiescent current during LIN bus shorts to GND. The MAX13020/MAX13021 are available in the 8-pin SO package, and operate over the -40°C to +125°C automotive temperature range. Ordering Information LIN BUS DOMINANT PIN-PACKAGE MANAGEMENT PART Applications MAX13020ASA+ — 8 SO +12V/+42V Automotive MAX13021ASA+ Yes 8 SO +24V Heavy Truck and Bus MAX13021ASA+/V+ Yes 8 SO Note: All devices are specified over the -40°C to +125°C automotive temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Typical Operating Circuit VBAT LIN BUS MAX5023 +5V LDO EN INH BAT * NWAKE MASTER NODE ONLY MAX13020 MAX13021 1kΩ TXD MICROCONTROLLER RXD NSLP GND LIN *OPTIONAL TXD PULLUP RESISTOR FOR READING WAKE-UP SOURCE FLAG Pin Configuration appears at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-0559; Rev 2; 10/12 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted. Positive currents flow into the device.) BAT.........................................................................-0.3V to +40V TXD, RXD, NSLP.......................................................-0.3V to +7V LIN ...........................................................0V to ±60V Continuous LIN to BAT..........................................................-80V Continuous NWAKE...................................................................-0.3V to +80V NWAKE Current (NWAKE < -0.3V) ....................................-15mA INH ..............................................................-0.3V to VBAT + 0.3V INH Current .......................................................-50mA to +15mA Continuous Power Dissipation 8-Pin SO (derate 5.9mW/°C above +70°C)...................471mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) ................................+300°C Soldering Temperature (reflow) ......................................+260°C 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. ELECTRICAL CHARACTERISTICS (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER BAT Supply Voltage SYMBOL VBAT CONDITIONS Operating range Sleep mode, VNWAKE = VBAT, VTXD = VNSLP = VGND BAT Supply Current IBAT TYP 5.0 VBAT = +27V, VLIN = VBAT 1 4 VBAT = +38V, VLIN = VBAT MAX UNITS 38.0 V 8 8 Standby mode, bus recessive, VBAT = +5V to +27V, VLIN = VINH = VNWAKE = VBAT, VTXD = VNSLP = VGND 100 Standby mode, bus dominant, VBAT = +12V, VINH = VNWAKE = VBAT, VLIN = VTXD = VNSLP = VGND 300 1000 2000 Normal/low slope mode, bus recessive, VBAT = +5V to +27V, VLIN = VINH = VNWAKE = VBAT, VTXD = VNSLP = +5V 100 650 1000 1 4.5 8 Normal/low slope mode, bus dominant, no load, VBAT = VINH = VNWAKE = +12V, VTXD = VGND, VNSLP = +5V 2 MIN 650 1000 µA Sleep mode, bus dominant, VBAT = VNWAKE = +12V, VLIN = VTXD = VNSLP = VGND 90 Fault mode, bus dominant (MAX13021), VINH = VNWAKE = VBAT, VLIN = VGND, VNSLP = +5V 30 60 Disable mode, bus dominant (MAX13021), VBAT = VINH = VNWAKE = +12V, VLIN = VGND 20 30 mA µA Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ELECTRICAL CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TRANSMITTER DATA INPUT (TXD) High-Level Input Voltage VIH Output recessive Low-Level Input Voltage VIL Output dominant Pulldown Resistance RTXD 2 V 0.8 V 125 330 800 kΩ Low-Level Input Current IIL VTXD = VGND -5 0 +5 µA Low-Level Output Current IOL Standby mode, VNWAKE = VGND, VLIN = VBAT, VTXD = +0.4V, local wake-up request 1.5 6 mA IOL VLIN = VGND, VRXD = +0.4V 1.2 4.1 mA ILH Normal/low slope mode, VLIN = VBAT, VRXD = +5V -5 0 RECEIVER DATA OUTPUT (RXD) Low-Level Output Current High-Level Leakage Current +5 µA NSLP INPUT High-Level Input Voltage VIH Low-Level Input Voltage VIL Pulldown Resistance Low-Level Input Current RNSLP IIL 2 VNSLP = +5V VNSLP = VGND V 0.8 V 125 330 800 kΩ -5 0 +5 µA NWAKE INPUT High-Level Input Voltage VIH Low-Level Input Voltage VIL VBAT - 1.0 V VBAT - 3.3 V NWAKE Pullup Current IIL VNWAKE = VGND -30 -10 -3 µA High-Level Leakage Current ILH VNWAKE = +38V, VBAT = +38V -5 0 +5 µA Switch On-Resistance Between BAT and INH RSW Standby, normal/low slope modes, IINH = -15mA, VBAT = +12V 22 50 Ω High-Level Leakage Current ILH Sleep mode, VNWAKE = +38V, VBAT = +38V 0 +5 µA INH OUTPUT -5 LIN BUS I/O LIN Recessive Output Voltage VO(RECES) LIN Dominant Output Voltage VO(DOM) Maxim Integrated VTXD = +5V, ILIN = -1µA Normal/low slope mode, VTXD = VGND, VBAT = +7V to +27V, RTERM = 500Ω to BAT VBAT -1.0V V 0.2 x VBAT V 3 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers ELECTRICAL CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER High-Level Leakage Current SYMBOL ILH CONDITIONS MIN TYP MAX UNITS VLIN = VBAT, VTXD = +5V -5 0 +5 µA 0 +5 µA Device Leakage Current, VBAT Disconnected IL(BAT) VBAT = VGND, VLIN = +18V -5 Device Leakage Current, GND Disconnected IL(GND) VBAT = VGND, VLIN = -18V -100 0 µA Fault mode, disable mode (MAX13021) VLIN = VGND -10 -2 µA VBAT 2.5 VBAT 0.9 V Sleep mode, VLIN = VGND, VNSLP = VGND -10 -2 µA Standby, normal/low slope modes, VLIN = VGND, VBAT = +12V 20 30 47 kΩ VLIN = VBAT = +12V, VTXD = VGND, t < tDOM 27 40 60 VLIN = +12V, VBAT = +27V, VTXD = VGND, t < tDOM (Note 1) 45 70 100 LIN Current After Short Detection Short-Circuit Recovery Threshold Voltage LIN Pullup Current Slave Termination Resistance to VBAT Short-Circuit Output Current IIL(FAULT) Vth(RECOVERY) Fault mode, disable mode (MAX13021) IIL RSLAVE IO(SC) VBAT = +12V, VLIN = +60V, VTXD = VGND, t < tDOM mA 45 Receiver Dominant State Vth(DOM) VBAT = +7V to +38V Receiver Recessive State Vth(REC) VBAT = +7V to +38V 0.6 x VBAT Vth(CENTER) VBAT = +7V to +38V 0.475 x VBAT 0.5 x VBAT 0.525 x VBAT V Receiver-Threshold Hysteresis Voltage Vth(HYS) VBAT = +7V to +38V 0.145 x VBAT 0.16 x VBAT 0.175 x VBAT V Thermal-Shutdown Threshold TSHDN Receiver-Threshold Center Voltage Thermal-Shutdown Hysteresis 0.4 x VBAT V V +165 °C 10 °C ESD PROTECTION 4 Human Body Model LIN ±12 kV Contact Discharge IEC61000-4-2 LIN, NWAKE, BAT (tested to IBEE test setup) C1 = 100nF on VBAT, C2 = 220pF on LIN, R = 33kΩ on NWAKE ±4 kV Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers TIMING CHARACTERISTICS (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER LIN Duty Factor 1 D1 = tBUS(REC)(MAX)/(2 x tBIT) LIN Duty Factor 2 D2 = tBUS(REC)(MAX)/(2 x tBIT) LIN Duty Factor 3 D3 = tBUS(REC)(MAX)/(2 x tBIT) LIN Duty Factor 4 D4 = tBUS(REC)(MAX)/(2 x tBIT) Propagation Delay of Receiving Node Receiver Propagation Delay Symmetry SYMBOL CONDITIONS D1 VBAT = +7V to +18V, Vth(REC)(MAX) = 0.744 x VBAT, Vth(DOM)(MAX) = 0.581 x VBAT, tBIT = 50µs (Figure 4, Note 2) D2 VBAT = +8V to +18V, Vth(REC)(MIN) = 0.422 x VBAT, Vth(DOM)(MIN) = 0.284 x VBAT, tBIT = 50µs (Figure 4, Note 2) D3 VBAT = +7V to +18V, Vth(REC)(MAX) = 0.778 x VBAT, Vth(DOM)(MAX) = 0.616 x VBAT, tBIT = 96µs (Figure 4, Note 2) D4 Vth(REC)(MIN) = 0.389 x VBAT, Vth(DOM)(MIN) = 0.251 x VBAT, VBAT = +8V to +18V, tBIT = 96µs (Figure 4, Note 2) tp(RX) tp(RX)(SYM) MIN TYP MAX 0.396 — 0.581 0.417 -2 — — VBAT = +7V to +18V, CRXD = 20pF (Figure 4) Rising edge with respect to falling edge, VBAT = +7V to +18V, CRXD = 20pF, RRXD = 1kΩ UNITS 0.590 — 6 µs +2 µs Continuously Dominant-Clamped LIN Bus Detection Time tLIN(DOM)(DET) Normal/low slope mode (MAX13021), VLIN = VGND 40 80 160 ms Continuously Dominant-Clamped LIN Bus Recovery Time tLIN(DOM)(REC) Normal/low slope mode (MAX13021), VLIN = VGND 0.5 1 2 ms Sleep mode (Figure 3) 30 70 150 µs Normal/low slope mode, VTXD = VGND 20 80 ms Sleep mode 7 50 µs Dominant Time for Wake-Up of the LIN Transceiver TXD Permanent Dominant Disable Time Dominant Time for Wake-Up Through NWAKE Maxim Integrated tBUS tTXD(DOM)(DIS) tNWAKE 20 5 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers TIMING CHARACTERISTICS (continued) (VBAT = +5V to +38V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VBAT = +12V and TA = +25°C. Positive currents flow into the device.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Mode Change Time from Sleep/Standby Mode to Normal/Low Slope Mode tGOTONORM (Note 3) 2 5 10 µs Mode Change Time from Normal/Low Slope Mode to Sleep Mode tGOTOSLEEP (Note 4) 2 5 10 µs Note 1: Guaranteed by design for VBAT = VLIN = +27V. Note 2: Selected bit time, tBIT = 50µs or 96µs (20kbaud or 10.4kbaud). Bus load conditions (CBUS / RBUS): 1nF/1kΩ, 6.8nF/660Ω, 10nF/500Ω. Note 3: tGOTONORM is measured from rising edge of NSLP to RXD active. Note 4: tGOTOSLEEP is measured from falling edge of NSLP to RXD high impedance. Typical Operating Characteristics (VBAT = +12V and TA = +25°C, unless otherwise noted.) 7 6 5 4 3 VBAT = +38V VBAT = +12V 35 30 25 20 RL = 1000Ω CL = 1nF 15 10 1 5 TEMPERATURE (°C) TA = -40°C 25 TA = +25°C 20 TA = +125°C 15 10 5 LOW SLOPE MODE 10.4kbps 0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 30 MAX13020 toc02 NORMAL SLOPE MODE 20kbps 40 2 0 6 45 RL = 500Ω CL = 10nF SINK CURRENT (mA) SUPPLY CURRENT (mA) 8 50 OPERATING CURRENT (mA) SLEEP MODE VLIN = VBAT 9 MAX13020 toc01 10 SINK CURRENT vs. RXD OUTPUT LOW VOLTAGE OPERATING CURRENT vs. SUPPLY VOLTAGE MAX13020 toc03 SUPPLY CURRENT vs. TEMPERATURE 5 10 15 20 25 30 SUPPLY VOLTAGE (V) 35 40 0 1 2 3 4 5 RXD OUTPUT LOW VOLTAGE (V) Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Typical Operating Characteristics (continued) (VBAT = +12V and TA = +25°C, unless otherwise noted.) 35 TA = -40°C 30 TA = +25°C 25 INH ON-RESISTANCE (Ω) SINK CURRENT (mA) 40 TA = +125°C 20 15 ISINK = 15mA 45 40 35 VBAT = +12V 30 25 VBAT = +38V 20 15 100 80 70 50 40 30 10 20 5 5 10 0 0 1 2 3 4 5 MAX13020 VBAT = +12V 60 10 0 SLEEP MODE VLIN = 0V 90 IBAT FAULT CURRENT (µA) STANDBY MODE AFTER A LOCAL 45 50 MAX13020 toc04 50 IBAT FAULT CURRENT vs. TEMPERATURE MAX13020 toc05 INH ON-RESISTANCE vs. TEMPERATURE MAX13020 toc06 SINK CURRENT vs. TXD PULLDOWN OUTPUT VOLTAGE 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 OUTPUT LOW VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) LIN OUTPUT SPECTRUM LIN OUTPUT SPECTRUM LIN TRANSMITTING NORMAL SLOPE MODE MAX13020 toc08 MAX13020 toc07 MAX13020 toc09 LIN 5V/div LIN 5V/div TX 5V/div LIN 5V/div FFT 20dB/div FFT 20dB/div 10µs/div 2.5MHz/div RL = 660Ω CL = 6.8nF NORMAL SCOPE MODE 20kbps Maxim Integrated RL = 660Ω CL = 6.8nF LOW SCOPE MODE 10.4kbps 20µs/div 2.5MHz/div RX 5V/div 20µs/div RL = 1kΩ CL = 1nF NORMAL SCOPE MODE 20kbps 7 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Typical Operating Characteristics (continued) (VBAT = +12V and TA = +25°C, unless otherwise noted.) LIN TRANSMITTING NORMAL SLOPE MODE LIN TRANSMITTING NORMAL SLOPE MODE LIN TRANSMITTING LOW SLOPE MODE MAX13020 toc11 MAX13020 toc10 MAX13020 toc12 TX 5V/div TX 5V/div TX 5V/div LIN 5V/div LIN 5V/div LIN 5V/div RX 5V/div RX 5V/div RX 5V/div 10µs/div RL = 500kΩ CL = 10nF NORMAL SCOPE MODE 20kbps 10µs/div RL = 660kΩ CL = 6.8nF NORMAL SCOPE MODE 20kbps LIN TRANSMITTING LOW SLOPE MODE 20µs/div RL = 1kΩ CL = 1nF LOW SCOPE MODE 10.4kbps LIN TRANSMITTING LOW SLOPE MODE MAX13020 toc13 MAX13020 toc14 TX 5V/div TX 5V/div LIN 5V/div LIN 5V/div RX 5V/div RX 5V/div 20µs/div RL = 660kΩ CL = 6.8nF LOW SCOPE MODE 10.4kbps 8 20µs/div RL = 500kΩ CL = 10nF LOW SCOPE MODE 10.4kbps Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Pin Description PIN NAME FUNCTION 1 RXD 2 NSLP Sleep Input. Drive NSLP logic-high or logic-low to control the operating mode. (See Table 1 and Figures 1, 2) 3 NWAKE Local Wake-Up Input. Present a falling edge on NWAKE to generate a local wake-up event. Connect NWAKE to BAT with a 5kΩ resistor if local wake-up is not required. 4 TXD Data Transmit Input, CMOS Compatible. Drive TXD logic-low to force the LIN bus to a dominant state in normal/low slope mode. 5 GND Ground 6 LIN LIN Bus I/O. LIN is terminated with an internal 30kΩ resistor in normal slope, low slope, and standby modes. 7 BAT Battery Voltage Input. Bypass BAT to ground with a 0.1µF ceramic capacitor as close to the device as possible. 8 INH Inhibit Output. INH is active high in standby and normal/low slope modes. (See Table 1) Data Receive Output, Open Drain. RXD is logic-low when the LIN bus is dominant. RXD is active low after a wake-up event from sleep mode. Detailed Description The MAX13020/MAX13021 ±60V fault-protected lowpower local interconnect network (LIN) transceivers are ideal for use in automotive network applications where high reliability is required. The devices provide the interface between the LIN master/slave protocol controller and the physical bus described in the LIN 2.0 specification package and SAE J2602 specification. The devices are intended for in-vehicle subnetworks with a single master and multiple slaves. The extended fault-protected voltage range of ±60V on the LIN bus line allows for use in +12V, +24V, and +42V automotive applications. The devices allow communication up to 20kbaud, and include slew-rate limited transmitters for enhanced electromagnetic emissions (EME) performance. The devices feature a low-power 4µA sleep mode and provide wake-up source detection. The MAX13020 is a pin-to-pin replacement and is functionally compatible with the Philips TJA1020. The MAX13021 includes enhanced bus dominant clamping fault-management for reduced quiescent current during LIN bus shorts to GND. Operating Modes The MAX13020/MAX13021 provide two different transmitting modes, an intermediate standby mode and a low-power sleep mode. Normal slope mode allows fullspeed communication at 20kbaud with a slew-limited transmitter to reduce EME. Low slope mode permits communication up to 10.4kbaud, and provides addiMaxim Integrated t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 1 STANDBY MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 (t NORMAL SLOPE MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 1 NWAKE = 0 AFTER 1 TO 0) > tNWAKE OR t(LIN = 0 AFTER 1 TO 0) >tBUS t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP LOW SLOPE MODE SLEEP MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 INITIAL POWER-ON STATE Figure 1. MAX13020 Operating Modes tional slew-rate limiting to further reduce EME. The transmitting operating mode is selected by the logic state of NSLP and TXD (Table 1). To enter normal slope mode or low slope mode, drive TXD logic-high or logiclow, then drive NSLP logic-high for longer than tGOTONORM. The MAX13021 features two additional operating modes to reduce current consumption during LIN bus shorts to GND. On initial power-up, the device enters sleep mode. 9 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers t(NWAKE = 0 AFTER 1 TO 0) > tNWAKE t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP t(LIN = DOMINANT) > tLIN(DOM)(DET) FAULT MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM t(LIN = RECESSIVE) > tLIN(DOM)(REC) NORMAL SLOPE MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM t (NSLP = 1 AFTER 0 TO 1) TXD = 1 >t GOTONORM DISABLE MODE t(LIN = DOMINANT) > tLIN(DOM)(DET) STANDBY MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 TXD = 1 t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP (tNWAKE = 0 AFTER 1 TO 0) > tNWAKE OR t(LIN = 0 AFTER 1 TO 0) >tBUS t(NSLP = 0 AFTER 1 TO 0) > tGOTOSLEEP LOW SLOPE MODE SLEEP MODE t(NSLP = 1 AFTER 0 TO 1) > tGOTONORM TXD = 0 t(LIN = RECESSIVE) > tLIN(DOM)(REC) INITIAL POWER-ON STATE Figure 2. MAX13021 Operating Modes Sleep Mode Sleep mode is the lowest power operating mode and is the default state after power is applied to BAT. In sleep mode, the MAX13020/MAX13021 disable the LIN transmitter and receiver to reduce power consumption. RXD and INH are high impedance. The internal slave termination resistor between LIN and BAT is disabled, and only a weak pullup from LIN to BAT is enabled. While in sleep mode, the MAX13020/MAX13021 transition to standby mode when a local or remote wake-up event is detected. For applications with a continuously powered microprocessor, drive NSLP logic-high for longer than tGOTONORM to force the MAX13020/MAX13021 directly into normal slope mode if TXD is logic-high, and low slope mode if TXD is logic-low. From normal slope or low slope mode, drive NSLP logic-low for longer than t GOTOSLEEP to force the MAX13020/MAX13021 into sleep mode. Standby Mode In standby mode, the LIN transmitter and receiver are disabled, the internal slave termination resistor between LIN and BAT is enabled, and the INH output is pulled high. The MAX13020/MAX13021 transition to standby mode from sleep mode when a wake-up event is detected. From standby mode, drive TXD logic-high or logic-low, then drive NSLP logic-high for longer than tGOTONORM to transition to normal slope or low slope 10 mode. In standby mode, RXD is driven logic-low to transmit the wake-up interrupt flag to a microcontroller. The wake-up source flag is presented on TXD as a strong pulldown in the case of a local wake-up. In the case of a remote wake-up, TXD is pulled low by the internal 330kΩ resistor only. The wake-up interrupt and wake-up source flag are cleared when the MAX13020/MAX13021 transition to normal slope mode or low slope mode. Normal Slope Mode In normal slope mode, the MAX13020/MAX13021 provide the physical layer interface to a LIN bus through RXD and TXD. INH is pulled high and the internal slave termination resistance from LIN to BAT is enabled. Data presented on TXD is transmitted on the LIN bus with a controlled slew rate to limit EME. Drive TXD logic-low to assert a dominant state on LIN. The LIN bus state is presented on the open-drain output RXD. A dominant LIN state produces a logic-low on RXD. From standby or sleep mode, drive TXD logic-high, then drive NSLP logic-high for longer than tGOTONORM to enter normal slope mode. Drive NSLP logic-low for longer than tGOTOSLEEP to force the device into sleep mode from normal slope mode. Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Low Slope Mode Low slope mode is identical to normal slope mode, with the exception of the LIN transmitter. In low slope mode, the transmitter slew-rate is further limited for improved EME performance. Maximum data rate is limited to 10.4kbaud due to the increased slew-rate limiting of the LIN transmitter. From standby or sleep mode, drive TXD logic-low, then drive NSLP logic-high for longer than tGOTONORM to enter low slope mode. Drive NSLP logic-low for longer than t GOTOSLEEP to force the device into sleep mode from low slope mode. LIN Bus Dominant Management (MAX13021) The MAX13021 provides two additional states to implement reduced current consumption during a LIN-toGND short condition. When the MAX13021 detects a dominant-clamped fault on LIN, the device disables the transmitter and enters a low-power fail-safe mode. The receiver is disabled and a low-power comparator is enabled to monitor the LIN bus. When a recessive state is detected on LIN, the device exits fault mode and returns to standby mode. Fault Mode (MAX13021) The device enters fault mode from normal slope or low slope mode when a dominant state is detected on LIN for longer than tLIN(DOM)(DET). In fault mode, the slave termination resistor from LIN to BAT is disconnected, and the LIN transmitter and receiver are disabled to reduce power consumption. INH output remains pulled high. A low-power comparator is enabled to monitor the LIN bus. Fault mode is cleared, and the MAX13021 enters standby mode when a recessive state is detected on LIN for longer than tLIN(DOM)(REC). Disable Mode (MAX13021) The MAX13021 enters disable mode from fault mode after NSLP is driven logic-low for longer than tGOTOSLEEP. The INH output is high impedance in disable mode to reduce current consumption. The LIN transmitter and receiver are disabled, and the slave termination resistor from LIN to BAT is disconnected. A low-power comparator is enabled to monitor the LIN bus. The MAX13021 enters fault mode when NSLP is driven logic-high for longer than t GOTONORM . The device enters sleep mode if a recessive state is detected on LIN for longer than tLIN(DOM)(REC). Local and Remote Wake-Up Events The MAX13020/MAX13021 recognize local and remote wake-up events from sleep mode. The MAX13021 also recognizes local wake-up events from disable mode. A local wake-up event is detected when NWAKE is held at logic-low for longer than tGOTONORM after a falling edge. NWAKE is internally pulled up to BAT with a Table 1. Operating Modes NSLP TXD PULLDOWN RXD INH TRANSMITTER RECEIVER SLEEP 0 330kΩ High-Z High-Z Disabled Disabled No wake-up events detected STANDBY 0 330kΩ or strong pulldown 0 1 Disabled Disabled Wake-up detected from sleep mode. TXD indicates wake-up source. (Note 1) NORMAL SLOPE 1 330kΩ LIN 1 Normal slope Enabled (Notes 2, 3, 4) (Notes 2, 3, 5) MODE COMMENTS LOW SLOPE 1 330kΩ LIN 1 Low slope Enabled FAULT* 1 330kΩ LIN 1 Disabled Low power — DISABLE* 0 330kΩ LIN High-Z Disabled Low power — *MAX13021 only. High-Z = High impedance. Note 1: Standby mode is entered automatically after a local or remote wake-up event from sleep mode. INH and the 30kΩ termination resistor on LIN are enabled. Note 2: The internal wake-up source flag on TXD is cleared upon entering normal slope or low slope mode. Note 3: The internal wake-up interrupt flag on RXD is cleared upon entering normal slope or low slope mode. Note 4: Drive NSLP high for longer than tGOTONORM with TXD logic-high to enter normal slope mode. Note 5: Drive NSLP high for longer than tGOTONORM with TXD logic-low to enter low slope mode. Maxim Integrated 11 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers 10µA pullup. In applications where local wake-up capability is not required, connect NWAKE to BAT. For improved EMI performance, connect NWAKE to BAT through a 5kΩ resistance. A remote wake-up event is generated when a recessive-dominant-recessive sequence is detected on LIN. The dominant state must be asserted longer than tBUS to generate a remote wake-up (Figure 3). Wake-Up Source Recognition When a wake-up event is detected, the MAX13020/ MAX13021 enter standby mode and present the wake-up interrupt on RXD as a logic-low. The wake-up source flag is presented on TXD as a strong pulldown in the case of a local wake-up. In the case of a remote wake-up, TXD is pulled low by the internal 330kΩ resistor only. To read the wake-up source flag, pull TXD high with an external pullup resistor (see Reading the Wake-Up Source Flag section.) The wake-up interrupt and wake-up source flag are cleared when the MAX13020/MAX13021 transition to normal slope mode or low slope mode. The thermal-shutdown circuit forces the driver outputs into high-impedance state if the die temperature exceeds +160°C. Normal operation resumes when the die temperature cools to +140°C. Fail-Safe Features The MAX13020/MAX13021 include a number of failsafe features to handle fault conditions. Internal pulldowns are provided on control inputs TXD and NSLP to force the device into a known state in the event that these inputs are disconnected. LIN Short-Circuit Protection The LIN transmitter is current-limited to prevent damage from LIN-to-BAT shorts. TXD Dominant Timeout If TXD is shorted to GND or is otherwise held low, the resulting dominant LIN state blocks traffic on the LIN bus. In normal slope and low slope modes, the LIN transmitter is disabled if TXD is held at logic-low for longer than t TXD(DOM)(DIS) . The transmitter is reenabled on the next rising edge on TXD. Loss of Power If BAT or GND are disconnected, interrupting power to the MAX13020/MAX13021, LIN remains high impedance to avoid loading the LIN bus. Additionally, RXD is 12 LIN RECESSIVE VLIN 0.4 x VBAT 0.6 x VBAT tBUS LIN DOMINANT SLEEP MODE STANDBY MODE Figure 3. Remote Wake-Up Timing high impedance when BAT is disconnected, preventing current flow from a connected microcontroller. LIN Bus Dominant Management (MAX13021) The MAX13021 provides LIN bus dominant management protection to reduce current consumption during a LIN-to-GND short condition. When the LIN-to-GND short is cleared, and a recessive LIN state is detected, the MAX13021 returns to standby or sleep mode. ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against ESDs encountered during handling and assembly. The LIN, NWAKE, and BAT pins are protected up to ±4kV as measured by the IEC61000-4-4 Contact Discharge Model. LIN is protected to ±12kV Human Body Model. Protection structures prevent damage caused by ESD events in all operating modes and when the device is unpowered. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report documenting test setup, methodology, and results. Applications Information Master LIN Nodes Configure the MAX13020/MAX13021 as a master LIN node by connecting a 1kΩ resistor from LIN to INH with a blocking diode (see the Typical Operating Circuit.) INH is held at a logic-high level in normal slope, low slope, standby, and fault (MAX13021) modes. INH is high impedance in sleep mode and disable mode (MAX13021) to reduce power consumption. Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers tBIT tBIT tBIT VTXDL tBUS(REC)(MIN) tBUS(DOM)(MAX) VSUP(1) VTH(REC)(MAX) VTH(DOM)(MAX) LIN BUS SIGNAL VTH(REC)(MIN) VTH(DOM)(MIN) tBUS(DOM)(MIN) RECEIVING NODE 1 THRESHOLDS OF RECEIVING NODE 1 tBUS(REC)(MAX) VRXDL1 tP(rx1)F tP(rx1)F RECEIVING NODE 2 THRESHOLDS OF RECEIVING NODE 1 VRXDL2 (1) TRANSCEIVER SUPPLY OF TRANSMITTING NODE. tP(rx2)F tP(rx2)F Figure 4. LIN Waveform Definition Reading the Wake-Up Source Flag When a wake-up event is detected in sleep mode, the MAX13020/MAX13021 transition to standby mode and present the wake-up source flag on TXD as a strong pulldown in the case of a local wake-up. In the case of a remote wake-up event, TXD is pulled to ground only by an internal resistor. The wake-up source flag can be determined by connecting a pullup resistor to TXD. Choose the external pullup resistor such that TXD is a logic-high when a remote wake-up occurs, and when a local wake-up occurs and the strong pulldown drives TXD low. 0.1µF BAT NWAKE NSLP INH MAX13020 MAX13021 RL CL +5V TXD LIN RXD GND Figure 5. Test Circuit for AC Characteristics Maxim Integrated 13 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Functional Diagram MAX13020 MAX13021 BAT THERMAL SHUTDOWN WAKE-UP TIMER NWAKE INH MODE CONTROL NSLP TXD 5µA SLEEP/NORMAL TIMER LIN SLEW RATE CONTROL TXD TIME-OUT TIMER 30kΩ BUS TIMER RXD FILTER RXD/INT VBAT/2 GND 14 Maxim Integrated MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Pin Configuration Chip Information PROCESS: BiCMOS TOP VIEW + RXD NSLP NWAKE 1 8 2 3 MAX13020 MAX13021 TXD 4 SO Maxim Integrated Package Information INH 7 BAT 6 LIN 5 GND 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 TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SO S8+5 21-0041 90-0096 15 MAX13020/MAX13021 ±60V Fault-Protected LIN Transceivers Revision History REVISION NUMBER REVISION DATE 2 10/12 DESCRIPTION Added automotive qualified part to Ordering Information PAGES CHANGED 1 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. 16 ________________________________Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.